Project Summary
The purpose of Lichess is to provide a minimalist Chess game.
It requires no registration. You don't need to create an account.
It requires no Flash and can be run from any modern web browser.
Lichess provides following features:
* Multiplayer
* Single player with Artificial Intelligence
* Castling
* En passant
* Promotion
* Check, Chekmate & Stalemate detection
* Move hints and validation
Lichess is built using only Open Source software, including:
* PHP 5.3.2 with Symfony 2 & PHPUnit
* JavaScript with jQuery & UI
* HTML5 & CSS
* Ubuntu 10.04, nginx & Vim
* Crafty Chess engine
Badges
In a Nutshell, Lichess...
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has a well established, mature codebase
maintained by a very large development team
with stable Y-O-Y commits -
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took an estimated 150 years of effort (COCOMO model)
starting with its first commit in February, 2012
ending with its most recent commit 4 days ago
MIT License
Permitted
Commercial Use
Modify
Distribute
Sub-License
Private Use
Forbidden
Hold Liable
Required
Include Copyright
Include License
These details are provided for information only. No information here is legal advice and should not be used as such.
Project Security
Vulnerabilities per Version ( last 10 releases )
There are no reported vulnerabilities
Project Vulnerability Report
Security Confidence Index
Vulnerability Exposure Index
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30 Day SummaryFeb 22 2026 — Mar 24 2026
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12 Month SummaryMar 24 2025 — Mar 24 2026
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