Paywalled

Stellar customizeability with extra features for paid users. In my experience I didn't need the extras, but I still was able to make custom gradient backgrounds with fresh highlights. Can recommend, absolutely love it!

Stylergpt don't go on mobile phone, but you can trust the developper, he is a good one, let support him, he is professionnal too, hope there will be a gitlab repository

StylerGPT has made my ChatGPT experience more enjoyable by allowing me to customize the interface with different colors, fonts, and backgrounds. It's simple to use and offers a range of options to suit various preferences, whether for focus or creativity. Highly recommended!