@IceWolf I don't know enough about Krita to answer that to be honest. My guess is there's probably a lot of stuff in Krita that is not deterministic? That being said, I haven't looked into the save file format, but I feel like you could probably get that working in version control? Uuids won't be changing once they're set, right? I'm a little confused at what you mean by reproducible, because Krita's API is so limited you'd have trouble scripting that in the first place I would guess?