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Krita is working on a mobile version
(files.layer8.space)
Don't get too excited, because this is a prototype (by Timothée Giet) and isn't connected to #krita itself. But... You can get a feel of the way the workflow goes. I was really satisfied playing with it on my phone.
already exists
Not quite, what exists is the full app on mobile screens, while this appears to be mobile friendly controls