FAQ

Do I need to know how to code?

No. You describe what you want in plain English and Modmixer writes the code for you.

Which games does Modmixer support?

RimWorld and Minecraft, with more games planned. Use the game switcher at the top of the docs to pick the one you're modding.

Is Modmixer free?

The app itself is free and open-source. What you do need is access to an AI model, which you bring yourself, and that model has its own cost. Usually that's a few dollars of pay-as-you-go credit or an existing subscription. See Choosing an AI Provider.

Do I need my own AI subscription or API key?

Yes. Modmixer connects to an AI model that you provide, either through a pay-as-you-go provider like OpenRouter or an existing Claude or ChatGPT subscription. The setup screen walks you through it, and Choosing an AI Provider covers what to pick.

How is this different from just asking ChatGPT or Claude?

A chatbot can write code, but you'd still have to put the files in the right place, launch RimWorld, read the error logs, and publish to the Steam Workshop yourself. Modmixer does all of that. It writes the files into your mod folder, launches RimWorld to test, watches the logs for errors and fixes them, and helps you publish when you're happy.

Will Modmixer break my game or my other mods?

Modmixer only writes files for the mod you're building, and it saves a checkpoint every time it makes a change, so you can always roll back.

Can other people play my mod?

Yes. When you're happy with it, Modmixer helps you publish to the Steam Workshop so other players can install it. See Publishing Your Mod.