Cool, I remember Mostard client

Monstr is made by nostr:nprofile1qqsp8qm7ye84fhdj5j8m3nnlzll2mz0tqp28l3rhxjv70z5gwlppgucpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhsz9mhwden5te0wfjkccte9ehx7um5wghxyctwvshszrnhwden5te0dehhxtnvdakz7e8evgf and iirc he's not planning on making it a proper app, at least not anytime soon