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[lichess.org ](https://lichess.org )
==================================
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[](https://github.com/ornicar/lila/actions?query=workflow%3A%22Build+server%22)
[](https://github.com/ornicar/lila/actions?query=workflow%3A%22Build+assets%22)
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[](https://crowdin.com/project/lichess)
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[](https://twitter.com/lichess)
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< img src = "https://raw.githubusercontent.com/ornicar/lila/master/public/images/home-bicolor.png" alt = "Lichess homepage" title = "Lichess comes with light and dark theme, this screenshot shows both." / >
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Lila (li[chess in sca]la) is a free online chess game server focused on [realtime ](https://lichess.org/games ) gameplay and ease of use.
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It features a [search engine ](https://lichess.org/games/search ),
[computer analysis ](https://lichess.org/ief49lif ) distributed with [fishnet ](https://github.com/niklasf/fishnet ),
[tournaments ](https://lichess.org/tournament ),
[simuls ](https://lichess.org/simul ),
[forums ](https://lichess.org/forum ),
[teams ](https://lichess.org/team ),
[tactic trainer ](https://lichess.org/training ),
a [mobile app ](https://lichess.org/mobile ),
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and a [shared analysis board ](https://lichess.org/study ).
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The UI is available in more than [130 languages ](https://crowdin.com/project/lichess ) thanks to the community.
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Lichess is written in [Scala 2.13 ](https://www.scala-lang.org/ ),
and relies on the [Play 2.8 ](https://www.playframework.com/ ) framework.
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[scalatags ](https://www.lihaoyi.com/scalatags/ ) is used for templating.
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Pure chess logic is contained in the [scalachess ](https://github.com/ornicar/scalachess ) submodule.
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The server is fully asynchronous, making heavy use of Scala Futures and [Akka streams ](https://akka.io ).
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WebSocket connections are handled by a [seperate server ](https://github.com/ornicar/lila-ws ) that communicates using [redis ](https://redis.io/ ).
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Lichess talks to [Stockfish ](https://stockfishchess.org/ ) deployed in an [AI cluster ](https://github.com/niklasf/fishnet ) of donated servers.
It uses [MongoDB ](https://mongodb.org ) to store more than 1.7 billion games, which are indexed by [elasticsearch ](https://github.com/elastic/elasticsearch ).
HTTP requests and WebSocket connections can be proxied by [nginx ](https://nginx.org ).
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The web client is written in [TypeScript ](https://www.typescriptlang.org/ ) and [snabbdom ](https://github.com/snabbdom/snabbdom ), using [Sass ](https://sass-lang.com/ ) to generate CSS.
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The [blog ](https://lichess.org/blog ) uses a free open content plan from [prismic.io ](https://prismic.io ).
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All rated games are published in a [free PGN database ](https://database.lichess.org ).
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Browser testing done with [](https://www.browserstack.com).
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Proxy detection done with [IP2Proxy database ](https://www.ip2location.com/database/ip2proxy ).
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Please help us [translate Lichess with Crowdin ](https://crowdin.com/project/lichess ).
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See [lichess.org/source ](https://lichess.org/source ) for a list of repositories.
[Join us on discord ](https://discord.gg/hy5jqSs ) or in the `#lichess` freenode IRC channel for more info.
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Use [GitHub issues ](https://github.com/ornicar/lila/issues ) for bug reports and feature requests.
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Installation
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------------
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```
./lila # thin wrapper around sbt
run
```
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The Wiki describes [how to setup a development environment ](https://github.com/ornicar/lila/wiki/Lichess-Development-Onboarding ).
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HTTP API
--------
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Feel free to use the [Lichess API ](https://lichess.org/api ) in your applications and websites.
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Credits
-------
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See the [contributors ](https://github.com/ornicar/lila/graphs/contributors ) on this repository and [lichess.org/thanks ](https://lichess.org/thanks ).
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Supported browsers
------------------
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| Name | Version | Notes |
| ----------------- | ------- | ----- |
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| Chromium / Chrome | last 10 | Full support |
| Firefox | 55+ | Full support (fastest local analysis since FF 79) |
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| Safari | 10.1+ | Reasonable support |
| Opera | 55+ | Reasonable support |
| Edge | 17+ | Reasonable support |
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Older browsers (including any version of Internet Explorer) will not work.
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For your own sake, please upgrade. Security and performance, think about it!
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License
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-------
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Lila is licensed under the GNU Affero General Public License 3 or any later
version at your choice with an exception for Highcharts. See COPYING for
details.
