If your looking for a free AI image generator check this site out...
https://dream.ai/
It's available via web browser and mobile.
You get unlimited generations (I think) but the longer you use it in a day, the uglier the image gets.
Multiple models to choose from.
You don't need to login to create images.
Landing page for web
User interface
Some featured art
My sample art

You know those quotes I post at the bottom of each of my blogs? I used this app to create the backgrounds. XD
Enjoy!