# AlmasB/FXGL

Java / JavaFX / Kotlin Game Library (Engine)

Repository: https://github.com/AlmasB/FXGL
Canonical: https://ross.abutalabs.com/products/fxgl
Homepage: http://almasb.github.io/FXGL/
Language: Kotlin
License: MIT
License Family: permissive
Topics: game-development, game-engine, javafx, gamedev, kotlin, java, framework, game, 2d-game-engine, 2d-framework, fxgl, 2d, 2d-game-framework, mobile, android, web, ios, 3d, 3d-game-engine, jvm
Last push: 2026-07-01T14:39:51+00:00

## Health v2 (maintenance only)
Score: 73/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 90, release rhythm 37, longevity 100
- inputs: {"age_days": 4181, "days_push": 63, "days_rel": 209, "gap_med": null, "n_releases_24m": 1}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4852, forks 709 (observed 2026-08-28T04:09:01.430762+00:00)

## What it is
FXGL is a Java/JavaFX/Kotlin game development framework (engine) built on top of JavaFX, offering a high-level entity-component API for 2D games with experimental 3D support. It runs out of the box on desktop, Android, iOS, and web, and games can be packaged into a single executable jar or native image.

## Use cases
- build a 2D platformer or side-scroller in Java
- make an arcade or RPG game with JavaFX
- prototype a game idea quickly without engine setup
- teach game development in a university course
- build a business app with complex UI animations
- create a cross-platform game that runs on Android and iOS

## When to choose
- you want a JVM-based 2D game engine with no installation or setup
- you already know JavaFX and want a superset API
- you need hobby, academic, or commercial 2D games packaged as a single jar
- you want fast prototyping with a simple, clean, high-level API

## When to avoid
- you need production-grade 3D game development
- you want the largest ecosystem and asset store of Unity/Unreal
- you need maximum runtime performance for AAA-style games
- you are not working on the JVM

## Facets
- artifact type: framework
- maturity: active
- function: game-engine, graphics, animation, ui-components
- domain: cross-platform
- platform: jvm, windows
- tags: javafx, kotlin, java, 2d-game-engine, 3d-experimental, entity-component-system, gamedev, game-development, macos, linux, android, ios, web-server, desktop, mobile

## Member repositories
- AlmasB/FXGL (main) score 73

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:01.430762+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:18:24.297799+00:00, confidence not recorded.
  - readme: https://github.com/AlmasB/FXGL (fetched 2026-08-28T04:09:01.430762+00:00, sha e8a3322aa544)
  - homepage: http://almasb.github.io/FXGL/ (fetched 2026-08-29T09:00:59.695190+00:00, sha c8d323ca0cf7)
- Data as of 2026-08-30T08:39:29.467469+00:00.