I'm also building a personal ChatGPT client for a similar reason as the OP, which is to address the issues of buggy and slow UX, among others. As you mentioned, many people are currently working on projects using ChatGPT API. In fact, in the past 24 hours, around 12 new apps that have been showcased on OpenAI Discord channel alone. Some of these apps are open source, which makes them a great source of learning and inspiration for me.