nmrugg/stockfish.js

Health v2 · maintenance only

Adoption not part of the score

1193 stars · 168 forks observed · 2026-08-28

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

Member repositories

For agents

markdown · JSON · MCP: product_card(name="nmrugg/stockfish.js")