Oxygen Not Included Modding on OpenMods

Klei's colony sim with official mod support

Oxygen Not Included (2019) is Klei Entertainment's underground colony management sim. Like Klei's other games (Don't Starve Together), ONI ships with first-class Steam Workshop integration and an official modding API, same Lua-based architecture Klei uses across their projects.

The mod scene is mature: gameplay overhauls, additional building tiers, automation enhancements (smart pumps, gas filters), QoL UI mods, and quality-of-life automation.

The toolchain

• Steam Workshop: primary distribution.
• In-game Mods menu: toggle subscribed mods.
• Klei Mod API: Lua scripting, well-documented.
• Mod template on GitHub.

What you'll find on OpenMods

ONI mods live primarily on Workshop. GitHub-published ONI mods are common for technical projects. OpenMods catalogues these.

Practical notes

• Subscribe via Workshop. Mods auto-install.
• Each save embeds its mod set. Removing content mods from saves can corrupt them.
• Spaced Out! expansion compatibility. Most modern mods support both base ONI and Spaced Out.
• Klei patches occasionally break mods. Community catches up quickly.