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Factorio modpack doctor: 2.0 to 2.1

Paste your mod-list.json. For every mod, this asks the official mod portal whether a release exists for the branch you are moving to, and tells you which ones would stop your server before you touch it.

Why this is not "just change the version". Factorio treats 2.0 and 2.1 as different major mod versions. A mod declaring "factorio_version": "2.0" does not load under 2.1 however compatible its Lua happens to be: the author has to publish for the new branch. And the move is one way, because a save opened in 2.1 can never go back to 2.0.

Your mod list

Find it in your server's mods/ folder. Disabled mods are skipped. Only names are sent, never mod files.

checking the mod portal...

What each verdict means

This tool: v1.4 · updated 10 Sep 2026