Draw Things AI Generator is something new that just came out in the last couple months. While prompt to image AI art generation isn’t that new, being able to generate something offline right from your iPhone or iPad is pretty cool, all 100% free, even has image to image support. It has a bit of a learning curve, but you can make some pretty cool things from the app. The developer has made it work on older devices, obviously running from an M1 or M2 iPad is probably best. My M1 iPad Pro gets pretty warm after a few generations.

Developer is /u/liuliu