All free · No login · No paywall
50 Free Tools Built
Because They Didn't Exist
One Chinese parent. No tech background. AI as a co-pilot. 48 tools across life, investing, and learning — built in public, tested on myself first.
48Free Tools
1,031Pages (Major Planner)
900Squares Per Life
0Sign-ups Required
⭐ Featured — The Life Trilogy
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900 Squares — Human Life Archive
Watch famous lives animate — Chu Shijian started over at 74, Grandma Moses began painting at 78. No personal data. 7 lenses: Famous Lives, Fate Machine, Role Swap, Generation & more.
Explore Famous Lives →
Your Life is an A4 Sheet of Paper
Enter your birth month. See exactly where you are — and how much remains. Seal wishes on your paper. Unlock bonus months with 7 longevity habits. Find famous late bloomers who started after your age.
See My Paper →
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Life Clock — Black Holes & Time Illusions
What % of your life is a black hole — months so routine they left no memory? Toggle between clock time and felt time. Get your Life Density score. See golden overlap with your parents.
Run My Clock →
📈 Investing Tools
Built for my own value-investing practice. No sign-up, no data saved — just frameworks I actually use when screening Chinese A-shares.
Investment Tools Navigator
120+ vetted GitHub projects for quant investing, backtesting, AI/ML, crypto, and portfolio management. Sorted by stars with difficulty ratings and no-code alternatives.
Explore 120+ Tools →
Value Investing Calculator
Score a stock against Warren Buffett's investing principles — financial health, moat, management, valuation — and get a clear verdict.
Open Tool →
A-Share Value Investing Toolbox
A full toolbox for screening and scoring Chinese A-share stocks using value-investing criteria, built for my own daily analysis.
Open Toolbox →
Investment Punch Card
Buffett's "20 punches in a lifetime" thought experiment — turned interactive so you can actually track your own punches and the thesis behind each one.
Track My Punches →
10× Stock Screen
Check 12 value-investing criteria — scalability, pricing power, growth runway, financial discipline — and see if a company has the profile that creates decade-long wealth.
Run the Screen →
Are You in Love With Your Stock?
Eight honest questions about one holding. Conviction vs. attachment — two minutes, no data saved. Find out if you're holding on logic or just refusing to admit you were wrong.
Take the Check →
Should I Sell This Stock?
Six honest questions that separate the investment case from the ego case. Are you holding on logic — or just avoiding admitting you were wrong?
Run the Check →
The Supermarket Test
Financial reports tell you what a company did. The shelf tells you what it's doing now. A 10-point grassroots research checklist for consumer stocks.
Start the Test →
Buffett-Style Value Screen
A streamlined one-page screen — the most important Warren Buffett criteria only. Fast, focused, no noise.
Run the Screen →
🎮 Life Simulators
Mandela. Curie. Jobs. Kafka. Dostoevsky. Frida Kahlo. Newton. Darwin. At each turning point you face the same choice they did — before you see what they actually chose. Commit blind, then find out how close you were. View all 25 simulators → Why this format works →
Walt Disney
Fired for lacking imagination. Went bankrupt twice. Then built the most beloved brand on earth. 9 decisions.
Play →Soichiro Honda
Rejected by Toyota. Factory bombed twice. Still became the world's largest engine manufacturer. 8 decisions.
Play →Marie Curie
Not allowed to attend university. Lost her husband. Won the Nobel Prize twice. 9 decisions.
Play →Steve Jobs
Fired from his own company. Given 6 months to live. Came back to build the world's most valuable company. 10 decisions.
Play →J.K. Rowling
Single mother on welfare. Rejected 12 times. Then sold 600 million books. 8 decisions.
Play →Oprah Winfrey
Born in poverty. Fired as a TV reporter. Became the most powerful woman in media. 8 decisions.
Play →Elon Musk
SpaceX failed 3 times. Tesla nearly bankrupt. He kept going. 10 decisions that changed everything.
Play →Nelson Mandela
27 years in prison. Became president at 75 — the last square of a 75-year life. 9 decisions.
Play →Warren Buffett
Started with $114. Made his first big bet at 11. Built the greatest investing track record in history. 9 decisions.
Play →Stephen Hawking
Diagnosed with ALS at 21. Given 2 years to live. Survived 55 more — and rewrote physics. 8 decisions.
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Albert Einstein
Failed the entrance exam. Patent clerk for 7 years. Then rewrote physics in 12 months — and signed the letter that started the bomb. 8 decisions.
Play →
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Vincent van Gogh
Failed at 4 careers before picking up a brush at 27. Sold one painting in his lifetime. Left 900 masterpieces. 8 decisions — would you have kept going?
Play →
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Nikola Tesla
Cheated by Edison. Won the War of Currents. Gave away $400M in royalties to save a friend. Died broke in a hotel room. 8 decisions.
Play →
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Wolfgang Amadeus Mozart
Child prodigy. Walked away from court security at 25. Died at 35 in a pauper's grave with 800 works behind him. 8 decisions.
Play →
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Ludwig van Beethoven
Started going deaf at 26. Completely deaf by 44. Wrote the 9th Symphony in total silence — and had to be turned around to see the ovation. 8 decisions.
Play →
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Leonardo da Vinci
7,000 notebook pages. Fewer than 20 finished paintings. Designed flying machines 500 years early. Never stopped starting things. 8 decisions.
Play →
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Isaac Newton
Invented calculus and described gravity before age 26. Sat on it for 20 years. Then spent 30 years trying to turn lead into gold. 8 decisions.
Play →
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Charles Darwin
He had the theory of evolution in 1838. He didn't publish for 20 years. Then a stranger sent him the exact same idea. He had 90 days. 8 decisions.
Play →
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Thomas Edison
1,093 patents. The world's first R&D lab. He lit up Manhattan — then electrocuted animals to destroy Tesla's technology. 8 decisions.
Play →
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Sigmund Freud
Cocaine advocate, abandoned the seduction theory, wrote The Interpretation of Dreams to silence critics, broke with Jung, fled the Gestapo at 82. 8 decisions.
Play →
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Friedrich Nietzsche
Resigned his professorship at 34. Self-published books that sold under 100 copies. Wrote Thus Spoke Zarathustra in 10 days. Collapsed in Turin at 44 and never wrote again. 8 decisions.
Play →
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Franz Kafka
Insurance office by day. Writing at night. He gave his best friend instructions to burn The Trial and The Castle. Max Brod didn't. 8 decisions.
Play →
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Fyodor Dostoevsky
Mock execution at 28. Four years in Siberia. Gambling addiction. Wrote Crime and Punishment in 26 days under crushing debt. 8 decisions.
Play →
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Frida Kahlo
Bus accident at 18. 35 surgeries. 55 self-portraits. Two marriages to Diego Rivera. She said: I never painted dreams — I painted my own reality. 8 decisions.
Play →
UNDERDOG
Zhang Xue — Nobody Heard This Name
Broke motorcycle repairman. No money. No team. He beat Ducati at the World Superbike Championship on a Chinese-made bike. 7 decisions.
Play →
🀄 Learn Chinese — Free Browser Tools
Eight offline tools for English speakers learning Mandarin. No install, no login — open in any browser and start. Built because I live in China and know what actually helps.
Complete Mandarin Learning Guide
70+ curated Chinese learning tools organized by skill level. Free resources, browser-based apps, spaced repetition decks, writing templates — everything you need from HSK 1 to 6.
Browse 70+ Tools →
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Chinese Antonyms Game — 反义词连连看
380 opposite-word pairs (反义词) across 3 levels. Click to match — pinyin and English hints on every tile. Combo multiplier, hint button, 30+ rounds. Great for HSK vocab.
Play Now →
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Chinese Measure Words Game — 量词归类
Sort 8 nouns into their 4 correct measure-word buckets. 8 progressive levels — 个只张条 → rare literary counters. Click to select, click to place. All 8 right = next level. Pinyin + English on every word.
Play Now →
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HSK Text Analyzer — 中文难度检测
Paste any Chinese text. Every word color-coded by HSK level (1–6). See your comprehension % instantly. Hover any word for pinyin + English. Export unknown words. 4 sample texts included — HSK 2 story to HSK 6 essay.
Analyze Text →
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Mandarin Flashcards — HSK 1–3
400+ words with spaced repetition, level filter, clickable characters, and a story reader (English first, tap to reveal Chinese). No internet needed after first load.
Start Learning →
Chinese Writing Toolkit
11 letter types with sentence banks, word upgrade tables, 13 grammar patterns, and a practice pad. Invitation, thank-you, complaint, cover letter, self-intro and more.
Open Toolkit →
Chinese Reading Lab — 历史阅读理解
10 real historical decisions told in Chinese (HSK4–6). Click any word for pinyin + meaning. Make the decision before seeing what Mandela, Jobs or Buffett actually chose.
Start Reading →
Chengyu Stories — 成语故事
20 classic Chinese idioms with their 2,000-year-old stories. Read in Chinese, click words for pinyin, then pick the right 成语 for a modern scenario. HSK4–6.
Learn Idioms →
Pinyin Annotator — 拼音标注
Paste any Chinese text — pinyin appears above every character instantly. Tone colors, HSK level highlight, click any character for details. 2,500+ character dictionary.
Annotate Text →
🎓 Gaokao Major Planner — 1,031 Pages
The biggest tool suite on this site. 757 Chinese university majors + 259 career paths + 13 ranking lists — all cross-linked and updated with live vote data.
🗳️ Live Vote · Runs until 2028
Which Chinese Major Will Matter in 4 Years?
757 Chinese university majors translated into English. Vote for the ones you think will matter most in the AI era. Live leaderboard with AI impact ratings. Your vote shapes the rankings.
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Majors
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Ranking Lists
259
Career Paths
China Career Database — 259 Paths
Every career reachable from a Chinese undergraduate degree. Monthly salary range, AI disruption level, required skills, and which major leads there.
Browse Careers →
Major Rankings — 13 Lists
Best majors overall, AI-resistant picks, AI editor's choice, plus 10 category rankings (engineering, medicine, science, economics, law, and more).
See Rankings →
🧪 AI Experiments
Things I built when I needed a tool that didn't exist — career planning, exam prep, resilience training, challenge quizzes.
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The Loneliness Test
13 levels of solo challenges. Find out how much solitude you can handle, and use this interactive game as a creative social icebreaker to ask friends out.
Take the Test →
Tech Career Self-Assessment at 40+
12 questions across four dimensions — AI at work, continuous learning, financial resilience, and health. Find out how prepared your career is for the next five years.
Take the Assessment →
3-Question IQ Challenge
3 classic lateral thinking traps. Most people get at least one wrong — not because they're not smart, but because their brain moves too fast.
Take the Challenge →
China Civil Service Challenge
3.4 million applicants. 39,000 jobs. Try the actual 公务员考试 questions that shut out 99% of test-takers. Could you even clear the cut-off?
Take the Challenge →
2026 Gaokao English Test
20 real questions from the exam sat by 12.6 million Chinese students in 2026. Instant score. How do you compare?
Take the Test →
AQ Kids — Resilience Quiz Builder
Parents build a personalised quiz from 10 historical figures' real decisions. Kids face the same choices blind, then discover their Resilience Score.
Build a Quiz →
🎱 LUCKY
Shuangseqiu Lucky Number Generator
Pick 6 red balls (1–33) + 1 blue ball (1–16) for China's most popular lottery. Generate 1 to 10 sets at once. Pure random, no login.
Pick My Numbers →