Every tool here started with a real problem I wanted to solve. I build them in public, improve them with feedback, and keep them free whenever possible.
AI Decision Toolkit
Help Ordinary People Decide Better
Life is full of decisions. Should I change careers? Should I move cities? Should I invest in this stock? Should I take this trip? This toolkit gives you expert-grade AI prompts to decide 1% better on the decisions that matter most.
150+Decision Tools
200+Original Articles
ExpertAI Prompts
0Paywall
Free forever
No signup
No login
Works in browser
Privacy friendly
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AI Helps Me Realize My Ideas
Psychology quizzes, life visualization tools, and decision-making frameworks. Understand yourself, then build toward your vision.
Working Memory Test — How Many Digits?
Read a quote. Remember the digits. Each level adds one more. Built with 3 AIs and 15 versions — tests your real cognitive limit.
Mind Traps — 40 Psychology Laws
40 cognitive biases and psychology laws with real examples. Quick quizzes test your understanding. See how your mind tricks you.
The Loneliness Test — Social Icebreaker
12-question diagnostic. Reveals your loneliness profile and gives concrete social strategies. Built for people who want to connect.
900 Squares — Human Life Archive
Watch famous lives animate across 900 weeks. See Chu Shijian start over at 74, Grandma Moses begin at 78. No personal data stored.
Your Life is an A4 Sheet of Paper
Enter your birth month. See exactly where you are on a single page — and how much remains. Unlock bonus months with longevity habits.
Life Clock — Black Holes & Felt Time
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.
Family Trip Planner
Build a day-by-day family itinerary with time slots, member lists, and photos. Save as image or print. No login, no data stored — everything stays in your browser.
60 Passive Income Streams — Rated & Ranked
60 ways to earn money while you sleep — each explained, scored for realism, and ranked by difficulty. Filter by category and find what fits your situation.
SeatRisk™ — The Standing Timer That Fines You for Sitting
Every minute you focus, your net worth grows. Every minute you don't stand up, your health drains. Sit too long and you're liquidated. Global leaderboard included.
Relationship Reality Lab — 8 Honest Tests
Love Intensity, Situationship Detector, Attachment Style, Red Flag Detector and more. Scenario-based tests that tell you the truth, not what you want to hear.
$20M Investment Simulator
You're a retired athlete with $20 million. 5 decisions. 6 endings. Based on real celebrity finance disasters — Mike Tyson, Allen Iverson and more.
AI Startup Simulator
$10M from a16z. 5 decisions. 5 endings. Based on Builder.ai ($450M bankrupt), DeepSeek, Cursor. Can you survive the AI wars?
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AI Helps Me Educate Kids
Gaokao prep, resilience quizzes, career planning. Tools built for families navigating Chinese education and building future skills.
Which Chinese Major Will Matter in 4 Years?
757 Chinese majors translated to English. Vote for ones you think will matter most in the AI era. Live leaderboard + career paths.
Vote →
2026 Gaokao English Exam
Real exam format. Listening, reading, writing sections. Time-pressured. Get immediate feedback on every answer.
AQ Kids — Resilience Quiz Builder
8-question resilience assessment. Identifies your child's bounce-back strengths. Gives concrete strategies to build grit.
Polya Method Math Tutor
Stuck on a math problem? Work through it with Polya's 4-step framework. AI asks guiding questions — never gives you the answer. 20 classic problems included.
Mathematical Mindsets Guide
Based on Stanford Professor Jo Boaler's research. Why most kids think they're bad at math — and the 6 teaching strategies that actually change that.
100 Life Simulators
Play as Einstein, Jobs, Darwin, Curie, and 96 more. Make legendary decisions blind. Then see what they actually chose.
View All 100 →
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AI Helps Me Invest
Value investing calculators, stock screeners, research checklists. Frameworks built for screening Chinese A-shares and understanding business moats.
Value Investing Toolkit
6 tools for evaluating stocks using Warren Buffett's principles. No data saved — frameworks only.
6
Investing Tools
120+
GitHub Projects
⭐ NEW
My AI Investment Operating System
8 AIs × 7 experiments → your personalized investing playbook. 5-question diagnosis, committee verdict, fit score, and a copy-paste Prompt Library for Claude / ChatGPT.
★★★★★ 6 investing schools · Free, 3 min
中文版：我的AI投资操作系统 →
★★★★★ 6 investing schools · Free, 3 min
中文版：我的AI投资操作系统 →
10× Stock Screen
12 criteria for finding companies with decade-long wealth potential. Financial discipline + pricing power + growth runway.
Investment Punch Card
Buffett's "20 punches in a lifetime" — interactive tracker. Log each investment thesis and results.
Are You in Love With Your Stock?
8 honest questions. Conviction vs. attachment. Find out if you're holding on logic or just refusing to admit you were wrong.
The Supermarket Test
10-point grassroots research for consumer stocks. What the shelf tells you that financial reports don't.
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AI Helps Me Plan My Future
Career database, major rankings, pathway guides. 757 Chinese majors + 259 careers cross-linked with AI impact ratings.
China Career Database — 259 Paths
Every career from a Chinese undergrad degree. Salary ranges, AI disruption level, skills needed, which majors lead there.
Browse Careers →
Major Rankings — 13 Lists
Best majors overall, AI-resistant picks, by category (engineering, medicine, economics, law, and more).
See Rankings →
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AI Helps You Read China Clearly
Understand Chinese brands, appliances, culture, and language without friction. Practical tools for navigating China.
⭐ Top Pick
Wander China — Free AI Trip Planner for 31 Cities
Build a zero-error China itinerary by drag-and-drop, get AI to fill in the logic, and receive a real cost breakdown. Real opening hours, metro stops, ticket prices. No Chinese needed.
★★★★★ 31 cities · Free to use
New★★★★★ 31 cities · Free to use
China 五险一金 Calculator — What Every Worker Pays
Employee pays 18.5%, employer secretly pays another 33.5%. For a ¥10,000/month salary the company's real cost is ¥13,350. Interactive calculator + all 6 components explained + global comparison.
NewChina SIM Card Guide for Foreigners — Which Carrier & Plan 2026
¥5–39/month. Telecom, Unicom, or Mobile — which one fits your situation? 3-question picker, full plan comparison, step-by-step registration guide, and how to keep your Chinese number working from abroad.
NewChina Social Media Guide: 13 Platforms Compared
WeChat Video has 800M users. Douyin has 700M. Most foreigners have heard of neither. Compare all 13 Chinese platforms by MAU, demographics, and content type. Includes Platform Finder quiz.
NewHow Much to Never Work Again — 15 Countries Compared
Turkey: $140k. Indonesia: $733k. USA: $1.08M. China: $2.87M. Same $50k/year lifestyle, wildly different answers. Now with SE Asia. Interactive heatmap calculator — pick a country, see how long your savings last.
NewChina Holiday Guide: 122 Days Off — But Only 18 Are Yours
China workers get 122 days off on paper. Only 18–28 are real paid leave — while France gives 41. Interactive leave calculator by years of service, all 13 public holidays explained, daily work-life data, plus global comparison.
NewChina Cost of Living vs USA, Singapore, Japan & Korea
A meal costs ¥25 ($3.50) in China vs ¥145 ($20) in the USA — 5.8× cheaper. But buying an apartment in Beijing costs more per m² than in a US city. Compare 40+ items. 55-city rent ranking included.
NewChina Population Dashboard: 5 Numbers That Will Shock You
In 2025, China has 16× more pet cats & dogs than newborn babies. Interactive charts: 75 years of births, living generations, province breakdown, and projections to 2100. Data from Xiaohongshu.
NewChina's Education Crunch: The Peak Generation Effect
17.86M babies born in 2016 → record Gaokao competition in 2034. Interactive charts of birth rates, the education pipeline, and competition forecasts 2027–2043. Enter any birth year to see its full timeline.
China Appliance Guide — 20 Brands
Plan by room → verify brand stories → buy from official site. 20 brands with founding stories, quality tiers, official links. Community voting.
Learn Chinese — Free Browser Tools
10 offline tools for English speakers. HSK flashcards, text analyzer, writing toolkit, pinyin annotator, reading lab, idiom stories.
View All Tools →
AI Travel Planner Prompt Generator
Generate zero-error itineraries with AI. 3-step questionnaire → structured travel prompts ready to copy-paste into ChatGPT/Claude. Beijing & universal modes. Chinese | English
📖 How it works
📖 How it works
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Other Free Tools
Single-purpose utilities and experiments. Sometimes weird, always useful.
Website Growth Calendar — Day Day Up
A public calendar showing what was built each day. Watch a website grow from launch to today. Inspired by "好好学习天天向上" (Study hard, improve every day).
⭐ NEWWebsite Admin & Security Command Toolkit
500+ copy-ready commands for website admins, bloggers, and security engineers. WordPress CLI, Linux/Windows incident response, Nginx speed config, webshell detection, security hardening, Git deployment.
★★★★★ 10 toolkits · Free, no login
★★★★★ 10 toolkits · Free, no login
Shuangseqiu Lucky Number Generator
Generate combinations using your birth year, zodiac, or lucky numbers. No algorithm beats probability, but it's fun.