The app should be able to run on iPhone 14 Pro, I believe the requirements is about 6-8Gb of RAM. And I was not able to run it on iPhone 13 Mini, because it has only 4Gb of RAM.
(Draw Things is by far the most advanced app that supports on-device Stable Diffusion on iOS devices and Apple Silicon Macs. It had a non-standard UI, but otherwise is really good.)
https://apps.apple.com/us/app/draw-things-ai-generation/id64...
I guess the app store redirected me to the desktop store?? Does not indicate an iphone 15 being required at all
My guess here is that the model is just trained on too many sexy pirates (it also has a propensity for producing asian women, which this model seems to do too). It does look like they support negative prompts but it requires you using "##" to separate positive and negative. Interesting design choice. You'll find these negative prompts helpful: disfigured, low quality, child, sexy, nude, extra limbs, ugly hands; and anything in the same vein. What works best is dependent on the base model and there is variance between different positive prompts. You may also have more success with something like automatic1111 which as long as you feel comfortable doing a git clone (which you're on HN, so I assume you are) then it'll be a better interface, but I don't know if there's a apple arm model or if baremetal has improved since last I checked.