# Principia (open-source game)

> Principia is a free, open-source game for Android. Physics-based sandbox building game. It has 420 GitHub stars and is released under the BSD-3-Clause license, and you can install it from F-Droid.

Principia is a physics-based sandbox building game. Build and play advanced contraptions, circuiting, minigames, robot adventures and more. The sandbox contains 200+ different objects ranging from basic wooden building blocks to circuitry, electrical and mechanical components, small robots you can control and fight against, and a LuaScript object featuring Lua scripting that can interact with the world. Build a controllable car, a calculator or make your own game with circuitry or in Lua. The Principia community site contains tens of thousands of creative levels made by players like you, from impressive contraptions to amusing games all for you to browse through and play.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/Bithack/principia |
| Platforms | Android |
| Built with | Other |
| GitHub stars | 420 |
| License | BSD-3-Clause (open source) |
| F-Droid | https://f-droid.org/packages/com.bithack.principia/ (package com.bithack.principia) |
| F-Droid anti-features | Relies on a non-free network service |
| Google Play | not linked |
| App Store | not linked |
| Website | https://principia-web.se/ |
| Official | no |
| Category | Games |
| Latest release | 2026.09.19 (Sep 19, 2026) |
| Last commit | Sep 23, 2026 |

F-Droid builds its apps from source and flags anti-features: https://f-droid.org/en/docs/Anti-Features/

## Similar mobile apps

- [Mindustry](https://appsgit.com/mobile-apps/mindustry): An open-ended factory management game with RTS and tower defense elements. (29,269 stars, GPL-3.0-or-later)
- [Dolphin Emulator](https://appsgit.com/mobile-apps/dolphin-emulator): Nintendo console emulator. (15,624 stars, GPL-2.0-or-later)
- [PPSSPP](https://appsgit.com/mobile-apps/ppsspp): A PSP emulator for Android, Windows, Mac, Linux and iOS, written in C++. (14,608 stars, GPL-2.0-or-later)
- [RetroArch](https://appsgit.com/mobile-apps/retroarch): Retro games and emulators on your device! (14,250 stars, GPL-3.0-only)
- [Luanti](https://appsgit.com/mobile-apps/luanti): Voxel-based multiplayer game platform. (13,699 stars, LGPL-2.1-or-later)
- [Unciv](https://appsgit.com/mobile-apps/unciv): Open source 4X civilization-building game. (11,401 stars, MPL-2.0)

---

Canonical page: https://appsgit.com/mobile-apps/principia
Source: appsgit (https://appsgit.com), the app store for github. Data from the GitHub API, refreshed nightly.
Machine access: JSON API https://appsgit.com/api/v1/apps (OpenAPI: https://appsgit.com/openapi.json), MCP server https://mcp.appsgit.com/mcp, full index https://appsgit.com/llms-full.txt.