I haven't used it, but Quassel looks like a similar idea.

Alternatively using a Soju[1] with Goguma[2] for phone and Gamja[3] for web could work; FWIW, I use Soju, but not the other two.

1: https://sr.ht/~emersion/soju/

2: https://sr.ht/~emersion/goguma/

3: https://sr.ht/~emersion/gamja/