User repository on GitHub
Browser chess coach on Cloudflare: Stockfish owns truth, Jev owns judgment
- Forks
- 1
- Last pushed
- Updated Oct 2026
Repo stats from the GitHub API, cached Oct 2026.
Jev directory
CommunityJev Demos & Experiments
GameCoach Web
A browser chess coach where Stockfish (WASM) owns the truth about the position and Jev makes the coaching judgment after every move, with templates and a small writing model supplying the words. Status: Wave 0 scaffold and Jev feasibility spike.
- Stars
- 0
- Language
- TypeScript
- License
- GPL-3.0
- Reading time
- 2 min
- Published by
- Community
- Author
- joellewis
- Last verified
- Oct 2026
Used inJev for Gaming
- Languages
- TypeScriptRust
- Platforms
- CloudflareBrowser
- Capabilities
- Open sourceRequires API key
Highlights
- Stockfish compiled to WebAssembly owns the truth about the position; Jev makes the coaching judgment after every move.
- Templates plus a small writing model supply the words, keeping the judgment and the language generation separate.
- The coach is designed to run entirely on Cloudflare; the repo carries a product spec, build plan and contributor rules.
- Status is Wave 0 — scaffold and a Jev feasibility spike — so this is an early-stage project, not a finished coach.
- Development requires Node 22+, pnpm 11+ and a stable Rust toolchain; the repo is GPL-3.0-only licensed.
Quickstart
bash
pnpm install
pnpm typecheck
cargo checkWatch out
Grounded in the full repo README and GitHub metadata read on 2026-10-15. The README is brief and describes a Wave 0 scaffold with a feasibility spike, so no accuracy, latency or cost figures exist yet; the details live in the linked PRD and build plan, which were not part of the digest.
Questions about this entry
Short answers drawn from the linked project or page.
A browser chess coach that runs entirely on Cloudflare. Stockfish (WASM) owns the truth about the position, TypeSafe's Jev model makes the coaching judgment after every move, and templates plus a small writing model supply the words.
Stockfish is authoritative about the position; Jev supplies the coaching judgment made after each move. The README frames this as Stockfish owning truth and Jev owning judgment, with the wording produced separately by templates and a small writing model.
Not as a finished product. The README marks the status as Wave 0: scaffold and Jev feasibility spike, so expect an early-stage codebase rather than a working chess coach.
You need Node 22+, pnpm 11+ and a stable Rust toolchain. Then run pnpm install, pnpm typecheck and cargo check from the repo; the README lists those three commands as the development entry point.
In the repository: docs/PRD.md holds the product spec, docs/build-plan.md covers the architecture and build plan, and CLAUDE.md holds contributor and agent rules.
On Cloudflare, per the README's first line — the coach is designed to run entirely there. The captured README does not include deployment commands.
GPL-3.0-only, per the LICENSE file referenced in the README. The project is Joel Lewis's (joellewis on GitHub), and this catalogue text is written from the README captured on 2026-10-15.
Reactions & coverage
Posts, threads, and videos about this entry from around the web.
X: Search and tagging on keep.md
Reddit: Jev is on Workers AI as typesafe/jev
More Jev resources like this
Watches the Bluesky firehose and asks Jev eight questions about every sampled post in one call, covering intent, topic, sentiment, engagement bait, hostility, sarcasm, bot-ness and screen safety, then routes anything the model will not commit to into a needs-a-human lane. Live at cloutmetrics.ai.
Jev Demos & Experiments#community#catalog-import#madewithjev
Community
ragelink/firehose-judgeTypeScript
ragelink/firehose-judgeTypeScriptBrowser-only Laya demo suite: four Vite apps — a Traditional Chinese decision playground, Gomoku, Big Two and a 3D maze — run the Laya ONNX model on-device through Transformers.js, downloading fp16 weights from Hugging Face on first use.
Jev Demos & Experiments#community#catalog-import#madewithjev
Community
killkli/open-jev-layaPython
killkli/open-jev-layaPythonLive demo of Jev playing Flappy Bird: about twenty times a second the game asks one question, flap or wait, and applies Jev's choice exactly as returned — no thresholds, no backup rules, no retries.
Jev Demos & Experiments#community#catalog-import#logicrw
A public operator lab for TypeSafe Jev: a chess match as the flagship page, a row of smaller judgment booths, and one shared client that keeps the API key out of the browser via a local Python server or a Cloudflare Worker.
Jev Demos & Experiments#community#catalog-import#logicrw
Community
4anti/jev-broadcast-labJavaScript
4anti/jev-broadcast-labJavaScriptA Bun workspace pairing a typed decision API over System One providers with a React arcade where decision models play games and every call is stored and ranked. The sample code calls Jev through OpenRouter with boolean, choice and score questions.
Jev Demos & Experiments#community#github#typescript
Community
desplega-ai/system-oneTypeScript
desplega-ai/system-oneTypeScriptA BYOK workbench for practicing Jev concepts without official access: emulates State, Noul, Score and Choice via Groq, OpenAI, Anthropic, Gemini or local Ollama, or runs against native Jev with authorized credentials.
Jev Demos & Experiments#community#catalog-import#logicrw
From the Jev guides
Original write-ups on what this entry is for.
From the Jev AI model community
Posts from builders shipping with Jev right now.