There are a few.
Draw things https://drawthings.ai
Diffusionbee https://diffusionbee.com
Are apps available on macos. Not sure about other platforms.
Other than that a more complex approach is installing automatic1111 which is a web interface that runs locally. https://www.youtube.com/watch?v=kqXpAKVQDNU
You don't need a GPU. It'll just be a bit slower.