nmrugg/stockfish.js
Some data may be outdated — see provenance labels.
The Stockfish chess engine for web browsers observed · 2026-09-23
Health v2 · maintenance only
85/100
- Activity 95
- Release rhythm 63
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-10-21. Adoption (stars, forks) is never an input.
- gap_med: 216
- age_days: 4514
- days_rel: 35
- days_push: 35
- n_releases_24m: 2
Adoption not part of the score
1200 stars · 165 forks observed · 2026-09-23
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
A WebAssembly and asm.js port of the Stockfish chess engine (currently version 18) that runs entirely in web browsers. It ships in multiple builds (multi-threaded, single-threaded, lite, and asm.js) to balance strength, size, and browser compatibility, and is used as Chess.com's in-browser analysis engine.
Use cases
- add a chess engine to a web app
- run chess analysis in the browser
- build an online chess game with an AI opponent
- embed stockfish in a website
- client-side chess move evaluation without a server
- power a chess puzzle trainer in the browser
When to choose
- you need a strong chess engine running fully client-side in a browser
- you want to avoid hosting a backend engine service
- you need multiple build sizes to trade strength for load time
- you want the engine behind Chess.com's analysis
When to avoid
- you need a native-speed engine for server-side or desktop analysis
- your target browsers lack WebAssembly support and you cannot tolerate the weak asm.js fallback
- you cannot set cross-origin isolation headers and need maximum multi-threaded strength
- you are building a non-chess game AI
Facets
library · maturity active
game-engine wasm sdk gaming-tools web-development cross-platform browser wasm chess stockfish uci webassembly chess-engine browser-game-ai game-development web-server
1 source
- readme: https://github.com/nmrugg/stockfish.js · fetched 2026-09-23 · 413eaa8b65dd
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| nmrugg/stockfish.js | main | 85 |
For agents
markdown · JSON · MCP: product_card(name="nmrugg/stockfish.js")
Data as of 2026-10-19T08:05:51.212177+00:00 · Report a problem