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Box art for Outlast
MODMod · 2013 · Unreal Engine 3

Outlast

3 projects let you play Outlast together. Here's how they compare, and which one to start with.

C
Best bet so far

OpenOL (multiplayer beta, with OpenOL-Relay) by ShyKiss

Level with OpenOL fork with a native enemy patch, play kit and tests (own development) on rating and stage, with the bigger following on GitHub (24 stars to 0). It has partial story sync, easy joining with no port forwarding and automated tests. None of these projects is fully playable together yet.

Repository ↗

Every project, side by side

Best bet so far

OpenOL (multiplayer beta, with OpenOL-Relay)

ShyKiss

C
RoughAlpha builds, or partial sync without the story. Expect desyncs and crashes.
Stage
In development
Co-op
46%
Synced
  • See each otherSynced
  • StoryPartly
  • EnemiesPartly
  • WorldPartly
  • ItemsUnknown
Players say
Rate it and vote on its co-op %
Connect
Hosted relay
Players
Not stated
Tested
Automated tests
Features
Partial story syncEasy join, no port forwardingAutomated tests
Latest release
2.1.0 Aug 29, 2026
Last activity
Quiet Aug 29, 2026
GitHub stars
24
About this project

Rebuilt OLGame.exe plus packages dropped over a licensed Steam install (needs the Whistleblower DLC), multiplayer beta since 2.0.1, release 2.1.0 (2026-08-29). Source is public but no license is stated. Joining works through the standalone OpenOL-Relay 2.1.0 (room PUBLIC); the relay source embedded in the OpenOL repo uses the old packet format. Two-client tests show players, doors, player-spawned enemies (attacks, death, respawn) and story triggers synced; checkpoint loads are not synced, triggers fire for everyone wherever they are, and map enemies are duplicated (every client runs its own copy). Open upstream issues report that connect and Start Server do nothing. A scripted suite (two real clients plus protocol tests, 67 pass, 4 known-bug expectations) and three small relay patches (out-of-context triggers, enemy packet ids, late-join snapshots) is in the own fork https://github.com/G3RKA/OpenOL (tools/outlast-coop); details in games/outlast.

What you need

Your own copy of Outlast.

Sources
Repository ↗Suggest a correction

OpenOL fork with a native enemy patch, play kit and tests (own development)

G3RKA

C
RoughAlpha builds, or partial sync without the story. Expect desyncs and crashes.
Stage
In development
Co-op
51%
Synced
  • See each otherSynced
  • StoryPartly
  • EnemiesSynced
  • WorldPartly
  • ItemsUnknown
Players say
Rate it and vote on its co-op %
Connect
Hosted relay
Players
Not stated
Tested
Automated tests
Features
Partial story syncSynced enemiesEasy join, no port forwardingAutomated tests
Latest release
No release yet
Last activity
Active Oct 28, 2026
GitHub stars
0
About this project

A fork of OpenOL with its own work in tools/outlast-coop (the upstream has no license, the folder is MIT). A native patch of OpenOL 2.1.0's OLGame.exe keeps one real copy of every map enemy (the lower player id wins) instead of two, the same rule is written in EnemyChannel.cpp (not compiled), plus host and join scripts, three relay patches as files and an automated suite with real clients (67 pass, 4 known-bug expectations; menu path, New Game and rejoin 6 of 6). Tested on one PC with two copies of the game; two PCs, the internet and three players are untested. Checkpoint loads are still not shared and story triggers still fire for everyone wherever they are.

What you need

Your own copy of Outlast.

Sources
Repository ↗Suggest a correction

Outlast-Together

LucianLandIsBack

D
ExperimentalPrototype, research build, or abandoned before it got far.
Stage
Abandoned
Co-op
30%
Synced
  • See each otherUnknown
  • StoryUnknown
  • EnemiesUnknown
  • WorldUnknown
  • ItemsUnknown
Players say
Rate it and vote on its co-op %
Connect
Not stated
Players
Not stated
Tested
Not checked
Features
Open source
Latest release
No release yet
Last activity
Stalled Feb 8, 2025
GitHub stars
3
About this project

MIT-licensed school project with a networking DLL and a client folder, no releases. The README says there will be no updates after the school release unless the author feels like it, and the last commits scrap the DLL hook. What it synced was not checked.

What you need

Your own copy of Outlast.

Sources

-

Repository ↗Suggest a correction

Know another co-op mod for Outlast? Submit it.