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PurpleKingdomGames/indigo

An FP game engine for Scala.
Source code at GitHub https://indigoengine.io/
PurpleKingdomGames/indigo.json
{
  "createdAt": "2020-05-30T12:45:05Z",
  "defaultBranch": "main",
  "description": "An FP game engine for Scala.",
  "fullName": "PurpleKingdomGames/indigo",
  "homepage": "https://indigoengine.io/",
  "language": "Scala",
  "name": "indigo",
  "pushedAt": "2025-11-20T08:36:38Z",
  "stargazersCount": 702,
  "topics": [
    "elm-architecture",
    "game",
    "game-development",
    "game-engine",
    "gamedev",
    "indigo",
    "scala",
    "scalajs"
  ],
  "updatedAt": "2025-11-21T01:57:24Z",
  "url": "https://github.com/PurpleKingdomGames/indigo"
}

MIT License Latest Tagged Release Discord Chat Join the chat at https://gitter.im/Purple-Kingdom-Games/Indigo CI

INDIGO HAS MOVED HOME!!!

Please head over to https://github.com/PurpleKingdomGames/indigoengine for the up to date source code.

Indigo

Section titled “Indigo”

Indigo is a game engine written in Scala for functional programmers. It allows game developers to build games using a set of purely functional APIs that are focused on productivity and testing.

Indigo is built entirely on Scala.js + WebGL, but it’s sbt and Mill plugins will export games for web, desktop (via Electron), and mobile (via Cordova). Hypothetically consoles could also be supported.

Documentation can be found on indigoengine.io.

Thank you, to our sponsors! 💜

Section titled “Thank you, to our sponsors! 💜”

Thank you to all our wonderful sponsors, and particularly to dedipresta for their generous support.

![dedipresta]!(sponsors/dedipresta.png)

If you’d like to help advance our work, we are ever grateful for all forms of contribution, either by volunteering time or financial backing.

Full local build and test instructions

Section titled “Full local build and test instructions”

Using Nix

Section titled “Using Nix”

The root of the project contains a very very simple flake.nix file that, if you have nix installed and flakes enabled, will give you all the tools you need to build Indigo by running nix develop in the root directory.

Build requirements

Section titled “Build requirements”

You will need:

  • Mill
  • SBT
  • JDK (Update: 8 works, 17 is used in Indigo’s development)

Running the build

Section titled “Running the build”

On Mac / Linux, from the repo root to do a full build and test:

Terminal window
bash build.sh

On Windows, open up powershell and run:

Terminal window
& build.ps1

There is also another script which is a bit faster since it doesn’t build the examples or demos.

Terminal window
bash localpublish.sh

Software requirements for running games

Section titled “Software requirements for running games”

The list above covers the software needed to build Indigo itself, but to run a game you may also need:

  • NPM and/or Yarn
  • NodeJS
  • Electron
  • An http server that will serve static from a directory (suggestions: http-server via npm, or Python’s SimpleHTTPServer)
  • A frontend packaging tool such as Parcel.js