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Lichess

The free and open source chess server

Verified
We've verified that the organization lichess-org controls the domain:
- lichess.org
Learn more about verified organizations

3.4k followers
https://lichess.org
@lichess@mastodon.online
contact@lichess.org

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Overview
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README.md

Lichess is a charity and a free, libre, no-ads, open source chess server.

Complete list of source repositories (most, but not all, can be found below)
About
Discord
Development Onboarding

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lila lila Public

♞ lichess.org: the forever free, adless and open source chess server ♞

Scala 17.3k 2.5k
api api Public

Lichess API documentation and examples

TypeScript 508 160
scalachess scalachess Public

Chess API written in scala. Immutable and free of side effects.

Scala 737 223
mobile mobile Public

New Lichess mobile app in Flutter

Dart 1.9k 306

Repositories

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Showing 10 of 69 repositories

lila Public
♞ lichess.org: the forever free, adless and open source chess server ♞

lichess-org/lila’s past year of commit activity

Scala 17,258 AGPL-3.0 2,481 1,114 (9 issues need help) 26 Updated Oct 29, 2025
mobile Public
New Lichess mobile app in Flutter

lichess-org/mobile’s past year of commit activity

Dart 1,921 GPL-3.0 306 335 (4 issues need help) 25 Updated Oct 28, 2025
chess-openings Public
An aggregated data set of chess opening names

lichess-org/chess-openings’s past year of commit activity

Python 450 CC0-1.0 110 5 3 Updated Oct 27, 2025
papers Public
Papers that use Lichess data, study Lichess, or cite Lichess

lichess-org/papers’s past year of commit activity

TeX 31 CC0-1.0 4 3 0 Updated Oct 27, 2025
op1 Public
Probe Marc Bourzutschky's partial 8-piece tablebase, op1

lichess-org/op1’s past year of commit activity

C 1 AGPL-3.0 0 0 0 Updated Oct 26, 2025
scalachess Public
Chess API written in scala. Immutable and free of side effects.

lichess-org/scalachess’s past year of commit activity

Scala 737 MIT 223 4 5 Updated Oct 25, 2025
lila-tablebase Public
Tablebase server

lichess-org/lila-tablebase’s past year of commit activity

Rust 91 AGPL-3.0 15 0 1 Updated Oct 25, 2025
api Public
Lichess API documentation and examples

lichess-org/api’s past year of commit activity

TypeScript 508 AGPL-3.0 160 21 0 Updated Oct 25, 2025
fishnet Public
Distributed Stockfish analysis for lichess.org

lichess-org/fishnet’s past year of commit activity

Rust 836 GPL-3.0 109 5 1 Updated Oct 24, 2025
fishnet-builder Public
Docker image for an environment that can produce fully static Stockfish builds

lichess-org/fishnet-builder’s past year of commit activity

C 2 0 0 0 Updated Oct 24, 2025

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Top languages

Rust Scala TypeScript Python Dart

Most used topics

lichess chess stockfish dart functional-programming

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