PortedGames
X-COM: Apocalypse cover art
X-COM: Apocalypse. X-COM: Apocalypse artwork, via IGDB. Unofficial site, not affiliated with the publisher.
PC port · MS-DOS → PC

OpenApoc (X-COM: Apocalypse engine rebuild)

An open-source rebuild of the X-COM: Apocalypse engine that runs the original files with modern resolutions, modding, XML saves and optional improvements. Still alpha, short of fully playable.

UnreleasedEngine rewriteNeeds your own copyv20260916 buildUpdated

You need your own copy of X-COM: Apocalypse. This port only runs with files from a copy you own; there is no download or play button here. No copy? These play in your browser right away, no files needed: BO1 Zombies (vel.gg), GTA 3 Online (quenq III Web), The Simpsons: Hit & Run WASM.

What you need

The original X-COM: Apocalypse files (GOG and Steam sell the game), plus a 64-bit Windows PC or a Linux or Mac system you can build on. Still alpha.

Official releases ↗GitHub repository ↗

We do not host any files. Only download from the project's official source.

Every version of X-COM: Apocalypse 1

  1. OpenApoc (X-COM: Apocalypse engine rebuild)This page

    UnreleasedEngine remake

    Opensource rebuild of the XCOM Apocalypse Engine that requires the original files to run.

    Runs on Windows (64-bit), Linux and macOS (build from source)Needs files from a copy you own★ 60420260916 build · Sep 16, 2026

    Website ↗

We link to each project's own page and host no game files. Version data from project pages, our daily checks and awesome-decomp-games (CC0).

Short answer

OpenApoc is an open-source rebuild of the X-COM: Apocalypse (1997) engine that runs the original files with modern resolutions, full modding, XML saves and optional improvements. It is still in alpha, short of a fully playable game. It needs your own copy. Latest Windows build: 16 September 2026.

This site is not affiliated with OpenApoc, Mythos Games or MicroProse. We do not host any files and only link the project’s official pages.

What it is

X-COM: Apocalypse (1997), the third X-COM game, moved the war to the city of Mega-Primus and added real-time combat. It is sold on GOG and Steam but runs through DOSBox.

OpenApoc “is an open-source re-implementation of the original X-COM: Apocalypse, that requires the original files to run” (OpenApoc README). The project began in 2014.

Current status

  • Alpha. The README’s “What’s left?” list starts with reaching “a truly playable alpha state”, followed by a beta with “all core original game features implemented” and a 1.0 that matches or exceeds the original.
  • Builds: Windows builds such as 20260916 (16 September 2026), as an installer and a zip. Linux and macOS build from source.

Key features

From the README:

  • full modding capability, with options to make the game more balanced, diverse or immersive;
  • human-readable save games (XML in a ZIP archive);
  • modern screen resolutions and display scaling at 60 fps;
  • a “More Options” menu with dozens of optional improvements;
  • an experimental skirmish mode;
  • a debug system with hotkeys;
  • smooth sound without the original’s pops and stutters, and room to restore cut features.

What you need

  • The original X-COM: Apocalypse files from your own copy.
  • A 64-bit Windows PC, or Linux or Mac if you build it.

We do not link any copies of the game data.

For the first two X-COM games, the complete OpenXcom is the recommended way to play.

FAQ

Can I play X-COM Apocalypse with OpenApoc?

Partly. OpenApoc is in alpha; its own roadmap's first milestone is still to reach a truly playable alpha, then a beta with all core original features. You can try it with your own game files, but expect missing features.

Does OpenApoc need the original game?

Yes. It is an open-source re-implementation that requires the original X-COM Apocalypse files to run. GOG and Steam sell the game.

What does OpenApoc add?

Modern resolutions and display scaling at 60 fps, full modding capability, human-readable XML saves, a More Options menu of optional improvements, an experimental skirmish mode and a debug system.

Is OpenApoc related to OpenXcom?

No, they are separate projects. OpenXcom covers the first two X-COM games (UFO Defense and Terror From the Deep) and is complete; OpenApoc covers the third game, Apocalypse.

Unofficial. This page is written by an independent directory. It is not made by, endorsed by or affiliated with MicroProse (developed by Mythos Games) or OpenApoc contributors (OpenApoc (X-COM: Apocalypse engine rebuild)'s author). We do not host any files, and we never link to game files, ROMs or ISOs.

Sources

This page was last updated on Nov 3, 2026. A date after a source is the day we read it. Versions and steps follow the official project; if they differ, the official source wins.

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