Why do you feel more anxious the deeper you fall in love? Or why does getting close to someone you care about make you want to pull away? Explore your attachment style — the hidden relational blueprint formed in childhood — and discover what it means for your adult relationships.

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Magazine: 4-Question MBTI Compass — A Fast Snapshot of Your Cognitive Style

A lightweight 4-question check to map energy, information, decisions, and planning style. Try the ahoxy-style MBTI mini test on blog-oiyo.

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MBTI Stress Type Test: How Each Personality Type Handles Pressure

Choose your MBTI type and review likely stress triggers, warning signs, and recovery strategies. A practical guide to personality-based stress relief.

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The Monkey and The Observer: Mastering Meta-Cognition

How to tame the jumping monkey of the Default Mode Network and activate the clear-eyed Observer through the power of mindfulness.

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Big Five (OCEAN) Personality Test: Measure Your 5 Personality Dimensions

Openness, Conscientiousness, Extraversion, Agreeableness, Neuroticism — the most extensively validated personality model in psychology. Measure your complete personality profile with this 15-question scientific assessment. See how it differs from MBTI.

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Burnout Self-Assessment: Check Your Exhaustion Level in 10 Questions

A reading-first burnout self-assessment for emotional exhaustion, cynicism, and reduced efficacy. Check your current risk level and review practical recovery steps.

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Enneagram Personality Type Test: Discover Your True Self Through 9 Types

Take the 27-question Enneagram test to accurately identify your personality type (1–9). Get a full analysis of each type's core desire, core fear, strengths, growth points, wings, integration, and disintegration directions.

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The 5 Love Languages Test: Discover How You Give and Receive Love

Words of Affirmation, Acts of Service, Receiving Gifts, Quality Time, Physical Touch — take Gary Chapman's 15-question forced-choice test to find your primary love language and transform how you connect with your partner.

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Integrated Love Profiler: Discover Your Attachment Style, Love Language & Conflict Mode

A 28-question integrated test that analyzes your attachment style (secure/anxious/avoidant/disorganized), primary love language (5 types), and conflict handling mode (5 styles) all at once. A complete romantic profile for healthier relationships.

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View all →

Tax & Finance

71 tools

Salary Calculator

Pre/post-tax salary and take-home pay

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Acquisition Tax Calculator

Automatic property acquisition tax

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Capital Gains Tax Calculator

Real estate and stock capital gains tax

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Property Tax Calculator

Calculate property holding tax

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Severance Calculator

Estimated severance by tenure

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Freelancer Tax Calculator

Business income tax and insurance

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Year-End Tax Settlement

Estimated refund or payment amount

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Compound Interest Calculator

Simulate asset growth over time

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Pension Calculator

Estimated national pension benefits

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ISA Calculator

Individual savings account returns

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DSR Calculator

Debt service ratio calculation

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Rent Conversion Calculator

Compare monthly rent vs lump-sum

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Rental Yield Calculator

Investment property rental yield

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VAT Calculator

Calculate supply price and VAT

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Stock Average Calculator

Average cost with additional buys

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Brokerage Fee Calculator

Compare stock and ETF trading fees

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Inflation Calculator

Real purchasing power by year

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ROI Calculator

Calculate return on investment

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Tip Calculator

Calculate tip per person for any bill

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Subscription Points (청약)

Dependents, bank years, no-property → score out of 84

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Early Repayment Calculator

Interest saved, term reduction, net savings after penalty

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Annual Leave Calculator

Accrued and remaining PTO by start date

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Jeonse Safety Calculator

Deposit LTV and recovery rate in foreclosure

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Global Income Tax

Compare income tax across KR, US, JP, FR, ES, CN, TW

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Insurance Premium Calculator

Estimate premiums by age, gender, smoking & health

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Financial Investment Tax

Korea financial investment income tax (금투세)

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Tax Savings Roadmap

Personalized tax-saving strategies by income, family & housing

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Dividend Calendar

Ex-dividend dates and schedule for dividend stocks & ETFs

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Salary Negotiation Calculator

Salary raise simulation: optimistic/moderate/conservative scenarios with after-tax pay

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Apt Subscription Score

Korean apt lottery score calculator: homeless period + dependents + savings (max 84pts)

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Jeonse-Monthly Converter

Convert between Korean jeonse and monthly rent using conversion rate

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Reconstruction Profit Calculator

Calculate net profit, ROI & annualized return for apartment reconstruction

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Currency Converter

Bidirectional currency converter for 20 currencies (USD, EUR, JPY, CNY, etc.)

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Latte Factor Calculator — How Small Daily Spending Habits Shape Your Future Wealth

A tool that calculates how much opportunity cost a small habitual expense — like a daily cup of coffee — creates over the long term. Visualizes the power of compound investment returns.

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Compound Interest & the 2048 Game: How Your Wealth Can Grow Exponentially

This is more than a game. Just as tiles merge and grow larger on the board, small habits can compound into vast wealth. Experience the principle of compound interest firsthand through the classic 2048 game.

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Cost Accounting Mastery: Traditional vs ABC Costing & Break-Even Analysis

Master cost classification (fixed/variable/mixed), compare traditional and ABC costing, and understand break-even analysis and operating leverage with an interactive simulator.

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Financial Ratio Trend Analysis: Diagnose Corporate Health with 3-Year Data

Understand 8 key financial ratios (current ratio, debt ratio, ROE, ROA, operating margin, etc.), their benchmarks, and use 3-year trend analysis to visually diagnose company financial health.

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Financial Statement Analyzer — Reading the Numbers, Interpreting the Ratios

Enter balance sheet and income statement data to instantly calculate current ratio, ROE, debt ratio, and more. Cash flow patterns and benchmark signals included.

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Korean Inheritance Tax Complete Guide: Deductions, Calculator & Tax Planning

Understand Korea's inheritance tax system, all deduction categories (spouse, children, lump-sum), progressive rates, and use a step-by-step calculator to estimate your actual tax.

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Journal Entry Fundamentals: Master Debit & Credit with 15 Real-World Scenarios

Learn the principles of double-entry bookkeeping from theory to practice. Conquer debit/credit journal entries with 15 real-world quiz scenarios and T-account visualization.

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The Complete Guide to Loan Interest: Comparing Repayment Methods and Strategies to Save More

How loan interest is calculated, a comparison of three repayment structures (equal payment, principal-first, interest-only), prepayment penalties, fixed vs. variable rate tradeoffs, and real-world strategies to minimize the total cost of borrowing.

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Mastering Macroeconomics: GDP, Keynesian Multiplier & Inflation — Interactive

Learn GDP measurement (3 approaches), the Keynesian multiplier effect, balanced budget multiplier, CPI inflation, and the Fisher equation with an interactive calculator.

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Magazine: Cost Accounting Interactive Lab — Build Your Break-Even Intuition

An experiment-driven lecture for developing CVP intuition. Adjust price, variable costs, and fixed costs to see exactly how the break-even point shifts.

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Magazine: Finance & Investment Interactive Lab — Mapping Expected Return and Cost of Capital

Enter your own inputs for CAPM and WACC to feel how expected returns and cost of capital are determined. Build the core intuition behind investment decision-making.

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Magazine: Investment Decision Interactive Lab — Making Decisions with NPV

Enter cash flows and discount rates directly to feel how NPV transforms investment judgment.

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Magazine: Macroeconomics Interactive Lab — When Policy Moves, the Graph Shifts

An experiment-driven lecture connecting IS-LM, AD-AS, and the Phillips Curve in one place. Move the policy levers and develop an intuitive feel for equilibrium in motion.

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What Career Fits You? — A Guide to the RIASEC Career Interest Test

Realistic, Investigative, Artistic, Social, Enterprising, Conventional. Dr. Holland's six-type framework helps you identify the work environments where you'll thrive. A guide to understanding your RIASEC profile and using it to design a more fulfilling career path.

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Rent vs. Buy Calculator — Which Option Is Actually Cheaper for You?

Calculate and compare the true cost of renting versus buying a home. This tool factors in opportunity cost on your down payment, monthly mortgage payments, property taxes, and maintenance — so you can see which option makes more financial sense for your situation.

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Stock Average Down Calculator — Cost Averaging Strategy and Break-Even Analysis

Calculate your new average cost basis when buying more shares after a price drop. Instantly see your new break-even price, how much the stock needs to recover, and whether averaging down makes sense for your situation.

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What Kind of Investor Are You? A Financial Personality Test

The first step to successful investing isn't market analysis — it's understanding yourself. Answer 10 questions to uncover your financial DNA and build a portfolio strategy that actually fits who you are.

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Supply & Demand Simulator — Feel Equilibrium, Surplus, and Elasticity by Doing

Shift supply and demand curves to watch equilibrium price and quantity change. Visualize consumer and producer surplus, tax incidence, deadweight loss, and price elasticity.

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T-Accounts and Trial Balance: Visualizing Double-Entry Bookkeeping

Understand T-account structure, the accounting equation (Assets = Liabilities + Equity), and the trial balance with an interactive visualizer.

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Korean Tax Formula Explorer — Learn the 6 Major Tax Formulas by Doing

Explore the official Korean tax calculation structures for income tax, corporate tax, VAT, capital gains tax, inheritance tax, and gift tax — with live inputs.

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Annual Leave Calculator: Accrual, Usage & Remaining Days by Start Date

Enter your start date to automatically calculate annual leave accrual, days used, and remaining balance under Korea's Labor Standards Act — including monthly accrual for the first year and 15 days per year thereafter.

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Korea Apartment Subscription Score Calculator: Homeless Period, Dependents & Savings Account

Calculate your Korea apartment subscription priority score using three criteria: homeless period (max 32 pts), number of dependents (max 35 pts), and subscription savings account tenure (max 17 pts). Maximum total: 84 points.

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Career & Finance Tools: Interview Prep, Dividends, Subscriptions, Global Tax & Year-End Settlement

Five tools in one page — interview question generator, dividend calendar, subscription points calculator, global income tax comparison, and year-end tax settlement calculator.

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Currency Converter: KRW, USD, JPY, EUR & Major Currencies Instantly

Convert between Korean Won (KRW), US Dollar (USD), Japanese Yen (JPY), Euro (EUR), British Pound (GBP), and other major currencies instantly. Great for travel budgeting and international shopping.

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Europe & Taiwan Salary Calculators: France, Spain & Taiwan Take-Home Pay

Enter a gross salary in France, Spain, or Taiwan to calculate net take-home pay after social contributions and income tax. Great for comparing compensation when considering a job abroad or relocation.

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Korea Financial Investment Income Tax Calculator: Stocks, Funds & ETF Gains

Calculate Korea's financial investment income tax on stock, fund, and ETF profits. Applies the ₩50 million annual deduction, 20% rate (25% above ₩300M), and 10% local tax surcharge to show your after-tax gain.

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Fuel Cost & Efficiency Calculator: Trip Fuel Expenses & Real MPG

Enter distance, fuel efficiency, and fuel price to calculate round-trip fuel costs. The efficiency calculator measures your car's actual km/L (or MPG) using the full-tank method. Includes eco-driving tips to cut costs up to 20%.

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Japan & China Salary Calculators: Take-Home Pay After Tax

Enter a gross salary in Japan (¥) or China (¥) to see net take-home pay after social insurance and income tax deductions. Compare with Korean salaries using real-time KRW conversion.

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Insurance Premium Calculator: Estimate Monthly Premiums by Age, Gender & Coverage

Enter your age, gender, and coverage type (whole life, term, cancer, medical expense, or annuity) to estimate a monthly premium range. Use it to plan an insurance portfolio before meeting an agent.

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Korea Jeonse Safety Calculator: Can You Get Your Deposit Back?

Enter the jeonse deposit, property market value, and senior-priority liens to analyze the safety of your deposit recovery. Helps prevent 'empty jeonse' (깡통전세) fraud and assess real risk before signing a lease.

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Korea Jeonse ↔ Monthly Rent Converter: Calculate the Equivalent Conversion

Convert between Korea's jeonse (lump-sum deposit) lease and monthly rent using the legal conversion rate (5.5% cap). See which arrangement is more financially advantageous for your situation.

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Korea Legal Interest Calculator: Civil, Commercial & Litigation Rate

Enter principal, period, and interest type (Civil 5% / Commercial 6% / Litigation special rate 12%) to instantly calculate statutory interest and total principal-plus-interest. Useful for loans, damages, and unpaid wages.

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Nutrition Calculator: Calories, Protein, Fat & Carbs by Food Item

Nutritional data for 20 common foods per 100g. Adjust serving sizes to track total calories, protein, fat, carbohydrates, fiber, and sodium in real time. Great for meal planning and diet management.

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Korea Real Estate Capital Gains Tax Calculator: Long-Term Deduction & 1-House Exemption

Calculate Korean capital gains tax on real estate sales. Automatically applies basic deduction (₩2.5M), long-term holding deduction (up to 80%), 1-household exemption (under ₩1.2B), and short-term heavy rates.

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Salary Negotiation Calculator: Target Raise, New Take-Home Pay & Strategy

Enter your current salary and target raise percentage to calculate your new gross salary, change in monthly take-home pay, and a three-tier negotiation target range. Prepare for your next salary review with data-driven confidence.

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Korea Reconstruction Profit Calculator: Additional Assessment & Expected Returns

Enter current property value, proportional ratio, rights value, and new unit price to calculate additional assessment and expected profit from a Korean reconstruction (재건축) or redevelopment (재개발) project.

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Separate Tax vs. Comprehensive Tax Calculator: Korea Financial Income Tax

Enter your financial income (interest + dividends) and other income to instantly compare separate tax (15.4% flat) vs. comprehensive progressive taxation. Includes the ₩20M threshold analysis.

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Korea Tax Savings Roadmap: Personalized Tax Reduction Strategy by Income

Enter your annual income and employment type (employee / business owner / freelancer) to get a prioritized roadmap of tax-saving vehicles — IRP, pension savings, ISA, deductions — with estimated savings for each.

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Health

30 tools

BMI Calculator

Body mass index and weight category

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Ideal Weight Calculator

Healthy weight range

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Macro Calculator

Protein, carbs & fat grams

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1RM Calculator

One-rep max & %

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Heart Rate Calculator

Max HR & training zones

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Body Fat Calculator

Estimate and classify body fat %

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Calorie Calculator

Daily calorie and nutrient needs

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Nutrition Calculator

Daily calories, protein, carbs, fat & water

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Water Intake Calculator

Recommended water by weight/activity

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Sleep Calculator

Optimal wake time by sleep cycle

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Caffeine Calculator

Caffeine half-life and safe intake

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Age Calculator

International and Korean age calculator

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Date Calculator

Days between & add/subtract

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Pregnancy Calculator

Gestational age and due date

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Height Predictor

Child height prediction by parent height

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Pet Age Calculator

Convert pet age to human years

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Fasting Timer

16:8, 5:2 and other fasting timers

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GPA Calculator

GPA average and graduation requirements

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Final Grade Calculator

Score needed on your final

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Menstrual Cycle Calculator

Next period, ovulation, fertile window & 3-cycle forecast

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Biorhythm Calculator

Physical, Emotional, Intellectual & Intuitive sine-wave cycles + 7-day forecast

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Anniversary & D-Day

Days elapsed (D+N) and countdown to any date

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Baby Name Generator

Korean baby name suggestions by gender, style & meaning with 5-element analysis

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Vaccination Schedule

Enter birth date to get full vaccination timeline for up to age 12 (Korean schedule)

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Baby Food Scheduler

Baby food guide by month (4–24m): stage, frequency, ingredients & allergen warnings

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Body Fat Calculator: Estimate Body Fat % by Height, Weight, Age & Gender

Enter your height, weight, age, and gender to calculate your body fat percentage and classify your physique. More accurate than BMI alone — understanding body composition helps guide smarter fitness and diet decisions.

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Calorie Calculator: Estimate BMR & Daily Calorie Needs (TDEE)

Enter your age, gender, weight, height, and activity level to calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE). Set calorie targets for weight loss, maintenance, or muscle gain.

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Menstrual Cycle Calculator: Next Period, Ovulation & Fertile Window

Enter your last period start date and average cycle length to calculate your next expected period, ovulation date, and fertile window. Includes a 3-month cycle calendar view.

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Sleep Calculator: Best Wake-Up Times Based on 90-Minute Sleep Cycles

Enter your bedtime to calculate optimal wake-up times aligned to complete 90-minute sleep cycles. Or enter your desired wake-up time to find the best time to fall asleep. Includes chronotype analysis.

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Water Intake Calculator: Daily Hydration by Weight, Activity & Temperature

Enter your weight, activity level, temperature, and coffee/alcohol intake to calculate your personalized daily water recommendation (ml/cups). Based on the WHO 30ml/kg formula with activity and climate adjustments.

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Image Tools

8 tools

Image Cropper

Crop and save images in-browser

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Image Pixelator

Convert images to pixel art

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Grayscale Converter

Convert color images to grayscale

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Palette Extractor

Extract dominant color palettes

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ASCII Art Generator

Convert images to ASCII character art

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Dog Vision Simulator

See the world through a dog's eyes

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Image Metadata Viewer

View EXIF data and image properties

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SVG Studio

Edit and optimize SVG images

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Utilities

33 tools

Word Counter

Real-time character, word, paragraph count

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Password Generator

Generate strong random passwords instantly

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UUID Generator

Generate UUID v4 random identifiers

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Hash Generator

Generate MD5, SHA-1, SHA-256 hashes

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Lorem Ipsum Generator

Generate dummy placeholder text

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Base64 Converter

Encode/decode text and files to Base64

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Morse Code Converter

Instantly encode/decode text to Morse and back

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World Clock

Live time in 15 cities: Seoul, NYC, London, Tokyo…

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Typing Speed Test

Measure WPM and accuracy in 15s, 30s or 1-min mode

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D-Day Counter

Countdown to your important dates and manage D-Days

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Stopwatch & Timer

Stopwatch, countdown timer and lap recorder

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Pomodoro Timer

25-min focus and 5-min break productivity timer

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Metronome

Precision metronome with BPM, tap tempo & time signatures

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Height Converter

cm↔ft/in conversion and male/female height comparison

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Emoji Picker

Search emojis by category and copy to clipboard

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Color Converter

Convert between HEX, RGB, HSL, HSV and CMYK

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Fuel Efficiency Calculator

Convert between km/L, L/100km and MPG instantly

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Fuel Cost Calculator

Calculate total fuel cost & per-person split with popular route presets

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TOEIC Score Converter

Convert TOEIC score to CEFR, IELTS & TOEFL iBT with job utility rating

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Vocab Flashcard

320 flashcards across TOEIC, business, daily & CSAT vocab sets with know/unknown tracking

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Travel Budget Calculator

Estimate travel expenses by destination, hotel class & flight for 10 popular destinations

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Random Food Picker

Can't decide what to eat? Random pick from 300+ dishes

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Magazine: Developer Utilities Lab — Building a Sense for Unit Conversion

Convert PX↔REM and HEX↔RGB hands-on to quickly internalize the practical intuitions that matter most in design and front-end development.

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Magazine: Digital Productivity — Typing Speed and the Brain

Fast typing isn't just a party trick — it's a form of Digital Agility that determines how efficiently your thoughts become output. Measure your WPM and learn how to improve it.

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Color Converter: HEX ↔ RGB ↔ HSL ↔ HSV Instant Conversion

Convert color codes between HEX (#ffffff), RGB (255,255,255), HSL, and HSV formats instantly. Use the color picker to select a color and copy all format codes at once.

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Developer Utilities: Hash Generator, Color Picker, Aspect Ratio & Emoji Picker

Four developer and designer tools in one page — MD5/SHA hash generator, color picker with HEX/RGB/HSL copy, aspect ratio calculator, and emoji picker. All processing happens in-browser with no data sent to any server.

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Height Converter: cm ↔ Feet (ft) ↔ Inches (in) Instant Conversion

Convert height between centimeters (cm), feet (ft), inches (in), and meters (m) instantly. Includes a reference chart for common heights and a unit conversion formula guide.

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Lorem Ipsum Generator: Instant Placeholder & Dummy Text

Generate Lorem Ipsum placeholder text for web/app design, UI mockups, and layout testing. Supports configurable paragraph count, word count, and Korean dummy text option.

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Morse Code Converter: Text ↔ Morse Code Real-Time Translation & Audio

Convert English text to Morse code (dots and dashes) or decode Morse back to text in real time. Includes audio playback of the Morse code signal and a complete international Morse alphabet reference.

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Password Generator: Create Strong Random Passwords Instantly

Generate strong random passwords combining uppercase, lowercase, numbers, and special characters. Configurable length (8–64 chars). Includes password strength analysis and security best practices.

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Pomodoro Timer: 25-Minute Focus Cycles to Maximize Productivity

A Pomodoro Technique timer managing 25-minute focus sessions and 5-minute breaks. Automatically alerts after 4 cycles for a long break. Tracks completed cycles and supports custom intervals.

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UUID Generator: Free Instant UUID v4 Random Identifier

Generate UUID v4 (Universally Unique Identifier) instantly. Supports bulk generation, uppercase/lowercase toggle, and hyphen removal. Use for database primary keys, API request IDs, and filenames.

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Word Counter: Character Count (with/without spaces), Word Count & Sentence Count

Paste any text to instantly count characters (with and without spaces), word count, sentence count, and paragraph count. Ideal for cover letters, social media posts, academic abstracts, and checking platform character limits.

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Games

16 tools

Lost Ark 1M/3A Distribution

Balance dealers & supporters for help parties

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Lost Ark Raid Bus Fee

Optimal bus auction price & carrier payout

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Sudoku

Classic Sudoku with 3 difficulty levels

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Minesweeper

Classic minesweeper game

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Snake Game

Classic snake arcade game

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2048 Game

Number tile merging puzzle game

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Wordle

Guess the word in 6 tries

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Chimp Test

Chimp vs human working memory test

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Lotto Number Generator

Generate random lottery numbers

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Wheel Spinner

Custom item random selection wheel

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Aim Trainer

30-second click accuracy and reaction speed training

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Connect Four

Classic 2-player connect four strategy game

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2048: The Game of Exponential Growth — Learning Compounding Intuition by Hand

A puzzle about merging number tiles to reach 2048. Play the game and internalize the pattern of exponential doubling, the principles of space management, and the intuition behind compound growth — all through your fingertips.

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Lottery Numbers and the Science of Luck: Managing Expectations Beyond the Odds

One ticket. One week of happy anticipation. For anyone who's ever dreamed of beating odds of 1 in 292 million — an exploration of the probability behind lottery numbers and the psychology of hope as its own reward.

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Lost Ark Auction Calculator: Fair Bid Price for Raid Loot

Calculate the equitable bid price for auctioned items in Lost Ark Legion Commander Raids and Abyss Dungeons. Enter market price and party size to instantly see the fair-split bid and max-gain bid amounts.

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Lost Ark Raid Splitter (Q1Q3): Auto-Balance Main & Alt Character Groups

Automatically distribute DPS and support characters across multiple games using the main-1-alt-1 (본1부1) or main-1-alt-3 (본1부3) format. Minimizes support imbalance across each game in the session.

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Fortune & Divination

12 tools

Biorhythm Calculator: Physical, Emotional & Intellectual Cycles

Enter your date of birth to calculate your physical (23-day), emotional (28-day), and intellectual (33-day) biorhythm cycles. See today's condition at a glance and plan your week around your natural peaks.

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Blood Type Personality & Compatibility: A, B, O, AB Type Analysis

Explore personality traits by blood type and analyze compatibility between two people. From Type A's attention to detail and Type B's independence, to Type O's leadership and Type AB's complexity — enjoy blood type culture as a fun conversation starter.

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Chinese Zodiac Calculator: Your Animal Sign, Personality & Compatibility

Enter your birth year to find your Chinese zodiac animal (Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, Pig), its Five Elements attribute, personality traits, and 2025 fortune outlook. Check two-person compatibility too.

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Daily Horoscope: Today's Fortune by Zodiac Sign

Select your zodiac sign to read today's overall fortune, love, money, and health outlook. Refreshed daily with lucky color, number, and direction for each of the 12 signs.

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Fortune Tools: Tarot Reading, Dream Interpreter & Daily Fortune

Explore three fortune tools in one page — tarot card spread reading, a dream interpretation dictionary, and a daily lucky message. Start your day with a moment of quiet inspiration.

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Love Calculator: Compatibility Score from Two Names

Enter two names to calculate a compatibility score (0–100%) based on a name algorithm. A fun couples compatibility test — purely for entertainment.

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MBTI Compatibility Calculator: Analyze Two People's Type Match

Enter two MBTI types to analyze compatibility across all four dimensions (E/I, N/S, T/F, J/P) and get a couple, friendship, and workplace compatibility reading. Covers all 16 × 16 type pairings.

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Numerology Calculator: Life Path Number, Birthday Number & Expression Number

Enter your date of birth and name to calculate numerology's core numbers — Life Path Number, Birthday Number, and Expression Number. Includes interpretations for 1–9 and Master Numbers 11, 22, and 33.

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Four Pillars (Saju) Calculator: Free Birth Chart Based on Korean Astrology

Enter your birth date and time to calculate the Four Pillars (사주팔자) — Year, Month, Day, and Hour pillars — using the 60-cycle Sexagenary system. See your Day Master, Five Elements distribution, and luck period.

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Tarot Daily Card: Draw a Major Arcana Card to Start Your Day

Draw one tarot card to receive its meaning, upright and reversed interpretations, and guidance for today. Based on the 22 Major Arcana cards.

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Zodiac Compatibility Test: Love, Marriage, Friendship & Work Compatibility

Calculate compatibility between any two of the 12 zodiac signs instantly. Based on elemental (Fire, Earth, Air, Water) and modality theory — get your love, marriage, friendship, and work compatibility scores free.

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Zodiac Personality Analysis: Traits, Strengths, Weaknesses & Compatibility

Select your zodiac sign to explore personality traits, strengths and weaknesses, relationship style, career tendencies, and compatibility. A complete guide to all 12 signs of the Western zodiac.

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Learning & Knowledge

10 tools

Game Theory in Human Relationships: Finding Win-Win in Conflict

We engage in a kind of 'secret game' interacting with others every moment. From the 'Prisoner's Dilemma' to the 'Tit-for-Tat' strategy, we learn the wisdom of game theory that clearly unpicks the c...

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Life is a Game of Overcoming: Adler's Psychology of Achievement

Life is not a journey toward perfection but a game of problem-solving. Turn challenges into growth quests using Adler's psychology of compensation.

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Light Up and Problem-Solving: The Logic of Illuminating Every Corner

One bulb lights a corridor, and numbers become clues that brighten the whole board. Through the Light Up puzzle, we explore how to find the breakthrough in complex problems and build strategies with zero blind spots.

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Magazine: Personal Color Interactive Lab — Turning Intuition into Structure

Take a quick test for tonal hints, then organize your color intuition into a clear, structured framework.

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Magazine: Game Theory Interactive Lab — The Delicate Balance Between Betrayal and Cooperation

Play the Prisoner's Dilemma directly to feel the cumulative effect of strategy. Build game theory intuition with your own hands.

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Magazine: Logic Interactive Lab — The Moment Truth and Falsehood Diverge

Manipulate propositional logic directly to internalize how truth tables work. You'll find that logical operations are more intuitive than you thought.

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Psychology Wordle: Find the Words That Describe Your Mind

Play and learn at the same time. Guess psychology vocabulary in a Wordle-style game — and pick up the core concepts behind emotion, the self, and memory along the way.

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D-Day Calculator: Save & Track Countdown Dates for Exams, Travel & Goals

Calculate days remaining (D−N) or days elapsed (D+N) to any target date. Save up to 20 D-Days in your browser, quickly select public holidays, and categorize with icons. Perfect for exam prep, travel planning, and personal milestones.

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English Learning Tools: Level Test, Vocabulary Flashcards & Typing Speed

Three tools for English improvement in one page — an English level test (CEFR A1–C1), vocabulary flashcards for efficient memorization, and a typing speed (WPM) test.

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TOEIC Score Converter: Level, CEFR & Job Application Standards

Enter your TOEIC score to see your English proficiency level (CEFR A1–C1), whether you meet major Korean employer and civil service thresholds, and how you compare to market benchmarks.

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Lifestyle

12 tools

The Biological Sports Car: Navigating Your Autonomic Nervous System

Understanding the delicate dance between your 'Gas Pedal' and 'Brake'—the Sympathetic and Parasympathetic systems—to build true resilience through modern neuroscience.

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Career Growth Snake: A Survival Strategy for Absorbing Knowledge and Avoiding Burnout

Your career must keep moving and growing — like a snake. Learn how to grow by consuming knowledge while avoiding the walls of burnout for a long, sustainable run, through the lens of the classic snake game.

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The Inner Galaxy: Navigating Your Gut-Brain Axis

Discover why your gut is known as the 'Second Brain' and how trillions of microbes influence your mood, immunity, and intuition through complex biological signalling.

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A Complete Guide to Spring Warm Light Personal Color: The World of Peach Blossom Type Colors

Spring Warm Light Characteristics of personal color types, optimal color palette, colors to avoid, makeup recommendations, even celebrity examples — the first in the 12 types of personal color perf...

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Anniversary Calculator: Auto-Calculate 100-Day, 1000-Day & Yearly Dates

Enter a start date to instantly calculate every major milestone — 22nd, 100th, 200th, 300th, 500th, 1000th day, and 1st through 10th anniversaries. Works for couple dates, work anniversaries, birthdays, and any meaningful day.

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Countdown Timer: Real-Time Days, Hours, Minutes & Seconds to Any Date

Set a target date and time to watch the countdown tick in real time — days, hours, minutes, and seconds. Perfect for exam D-days, birthdays, product launches, and personal goals.

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D-Day Counter: Track Multiple Important Dates — Days Remaining & Elapsed

Register important dates to automatically track both days remaining (D−N) and days elapsed (D+N). Manage multiple events simultaneously, all saved in your browser.

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Life Utilities: Metronome, Vaccination Schedule, Baby Food, Baby Names & Menu Picker

Five everyday tools in one page — an online metronome for music practice, infant vaccination schedule by birth date, baby food guide by age, baby name generator, and a random meal picker for when you can't decide what to eat.

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Marriage Age Calculator: Legal Age, Average First Marriage Age & Planning Timeline

Enter your date of birth to see whether you've reached the legal marriage age (18 in Korea), how you compare to the average first marriage age, and a timeline for wedding preparation milestones.

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Pet Age Calculator: Convert Dog & Cat Years to Human Age

Enter your pet's age and type (dog/cat) to see the human equivalent. Dog age varies by size (small/medium/large) because larger breeds age faster. Includes life-stage health care tips.

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Tip Calculator: Tip Amount & Per-Person Split for Any Party Size

Enter the bill amount and tip percentage (10, 15, 18, 20, or 25%) to calculate the tip, total, and each person's share. Includes a country-by-country tipping guide for US, Canada, Europe, Japan, and more.

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Travel Budget Calculator: Total Trip Cost by Flights, Hotels, Food & More

Enter trip duration, group size, and budgets for flights, accommodation, daily meals, transport, activities, and shopping to calculate total trip cost and per-person breakdown.

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