Since Stable Diffusion is open sourced, there are many apps based on it. If you're looking for something easy to use, have a look at aiTransformer, its tools are cloud based and requires almost no learning. The Super Stylizer (https://aitransformer.net/SuperStylizer) is based on Stable Diffusion but very simple to use with no server crashes. @Edmond Yip, can you have a look?