Open Source Community
The tools running in our production, open sourced
These are not demo repos โ they are the real tools and engineering practices we use daily in production and shipped projects, published together with every pitfall we hit along the way.
๐งฉ Building with AI
Small web apps you can build without writing code. Every method is public, and many come with the original conversations that produced them โ including the rounds that went wrong.
aihey-freeapp
No setup and no coding required: complete build notes for 38 vanilla front-end web toys โ a procedurally grown island, a rose made of 40,000 points, cloth that folds in the wind, a flock with no leader. For 23 of them we include the original chat transcripts that produced them: the one-liners, and the ones that took thirty rounds to get right.
๐ Quant Research
A complete loop from data download to strategy backtesting. The repos ship code only, no data; whatever data you download belongs to you.
astock-data-toolkit
A-share market data toolkit: OHLCV, valuation, financials, dividends, announcements and insider trades in one pipeline, with weekly auto-increment and 15-year backfill. Now also collects 5min/1min bars (direct quote-server feed, no client install) and daily call-auction snapshots, both shipped with bar-level and day-level quality checks. Includes hard-earned production notes.
astock-backtest-engine
Extensible A-share backtesting framework: 85 signal atoms + 13 classic strategies + 3 engines, vectorized (with Numba acceleration), modeling T+1, price limits and realistic three-part fees. Pairs with astock-data-toolkit to close the data-to-backtest loop.
usstock-data-toolkit
US market data toolkit: incremental 5-year daily OHLCV pipeline for the S&P 1500 via the Nasdaq public API (no key required), plus data-quality diagnostics and cleaning tools, with hard-earned notes on rate limits and server location.
๐ DeepSeek Harness Plugins
Plugins for dsh, DeepSeek's official agent harness โ one npm command installs them into your chat UI. This section grows as more plugins ship.
dsh-astock-research
Give DeepSeek Harness (dsh) A-share research skills: ticker search, announcements over any date range, plain-language financial cards, valuation profiles and signal explanations โ ~5,000 stocks since 2011. Pure JS with zero dependencies, one npm command to install; ships a compliance skill that states facts only, never recommends stocks, and appends a disclaimer to every answer.
๐ AI Education
An AI tutoring system with a hard separation between engine and subject content. We open sourced it hoping to find people who truly understand teaching.
eduai-engine
Subject-agnostic AI tutoring engine: Socratic guidance (never reveals answers), three-tier grading, answer-leak guardrails, a motivation system, and Ebbinghaus-scheduled review. Ships with 5 subjects and 1,081 questions; new subjects plug in via a contract-based plugin directory without touching the engine.
๐ฎ Game Development
Procedural assets and gameplay kits โ MIT code, CC0 assets, growing with every request.
unity-toolbox
A growing Unity toolbox with two shelves: art assets (the stylized-nature suite โ water, mountains, bridges, vegetation, forests, with builder tooling and post-processing) and gameplay kits (DroneKit โ a drag-and-drop quadcopter flight controller with stabilize/acro modes and three handling presets). Zero external assets; per-module unitypackages and prompt blueprints in Releases.
UNITYAI ๅทฅไฝๅฐ
Not open source ยท By arrangementA local AI workbench that drives Unity with domestic LLMs: describe what you want in plain language and it builds scenes, physics and interactions on your machine, environment included. Not publicly on sale โ get in touch to arrange access.
Learn more๐ Engineering Practice
Development pipelines and templates distilled from real products โ every workflow battle-tested in production, with pitfall notes, ready to copy.
ios-cicd-no-mac
Ship an iOS app to the App Store without ever touching a Mac: cloud build & signing on GitHub Actions, ad-hoc OTA install pages for on-device testing, and App Store delivery. Includes an openssl-based certificate walkthrough (no Keychain needed), copy-ready workflow templates, a minimal starter project and 9 hard-earned pitfall notes. Every release of the AIHEY iOS app ships through this exact pipeline.
The A-share pipeline powers AIHEY's data capabilities. Prefer not to run your own server? Use the hosted product: