I made two one-page react apps
https://www.livetranslate.net/
Second one is more refined but both are functional.
I was pleasantly surprised somebody made a YouTube tutorial in Japanese about the latter https://www.youtube.com/watch?v=8gAkvZYayEc - feels like retro internet where people share things on their personal webpages.
Curiously the first one also landed me a contracting opportunity for a company that wanted to add live captions to their product and we went live with my help.
I also made a decentralized twitter dapp ages ago but AI apps definitely have had more interest.