Local & private by design
Stockfish runs as a WebAssembly worker on your own hardware. No servers, no accounts, no data ever leaves the browser.
- No servers
- No accounts
- No telemetry
Local Stockfish for Chess.com
A chess engine that lives on your board.
Knight puts a private Stockfish engine right inside Chess.com — live evaluation, best-move hints and opening theory, computed entirely on your machine.
Stockfish in WebAssembly
Works offline
No accounts · no telemetry
English & Russian
Features
Everything you need, on the board.
A complete analysis companion that draws right onto Chess.com — no tabs, no copy-paste, no waiting.
Best-move hints, drawn for you
The engine paints its top candidate straight onto the board — here, the knight leaps to g5.
Position strength
A live bar reads the position in centipawns, so you always know who stands better.
Opening book
Knight recognizes known lines and names the theory as the game unfolds.
Match statistics
Track your games over time and surface the patterns in how you play.
Light & dark themes
Tuned to sit cleanly on top of Chess.com, whatever the hour.
English & Russian
The full interface speaks both languages — switch any time, including on this page.
Under the hood
A clean Manifest V3 pipeline.
Content scripts read the board and draw on it, a background worker routes requests, and an offscreen document runs the engine.
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Board
Content scripts read the live position and render hints on the board.
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Service worker
The background worker coordinates messages and engine requests.
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Offscreen engine
An offscreen document hosts the Stockfish WebAssembly worker.
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Evaluation
The score and best move return, drawn back onto the board.
Why local
Yours, not the cloud's.
Most “helpers” ship your games to someone’s server. Knight keeps everything on your machine.
Knight
Cloud helpers
Runs on your device✓✕
Works fully offline✓✕
No sign-up, no account✓✕
Source you can read✓✕
Free, with no limits✓~
Your data stays private✓✕
A closer look
Tune it to the way you play.
One panel, sensibly arranged. Pick a theme and language, set an ELO profile, then let the engine do the rest.
- Dark or light theme
- English or Russian interface
- ELO profile from beginner to club player
- Human-like timing controls
Install
Up and running in a minute.
Knight ships as an unpacked extension for Chromium browsers — Chrome, Edge, Brave. Firefox support is experimental.
- 1Download the latest release from GitHub.
- 2Unzip it somewhere permanent.
- 3Open the extensions page and turn on Developer mode.
- 4Choose “Load unpacked” and select the folder.
- 5Open Chess.com — Knight is on the board.
FAQ
Questions, answered.
Is Knight free?
Yes — Knight is free and open source under the MIT license. You can read, build and modify every line.
Does it really run locally?
Completely. Stockfish is compiled to WebAssembly and runs in your browser. After install, analysis works with no connection and nothing is ever sent to a server.
Is it allowed on Chess.com?
Knight is built for analysis, study and post-game review. Please don’t use it to gain an unfair advantage in live games against other people — that breaks Chess.com’s rules and isn’t what it’s for.
Which browsers are supported?
Any Chromium browser — Chrome, Edge, Brave. Firefox support is experimental for now.
Will it slow down my browser?
The engine runs in a separate offscreen worker, so the page stays responsive. You can dial the strength and timing to taste in settings.
How do I update it?
Download the newest release, replace the folder, and press reload on the extensions page. Your settings stay put.
Bring the engine to your board.
Free, open source, and entirely local. Install Knight and start studying smarter.
Built for analysis, study and review — please don’t use it to gain an unfair advantage in live games.