It's a nostr client? Or you mean Amber App the bitcoin wallet for signing into apps?
Amber signer on Android handles multiple npubs very nicely!
https://fountain.fm/episode/WZ3tI74ML94r0zSER5kL
nostr:nevent1qvzqqqpxquqzpajlk9046k7v66xkc6qt33ux4g78dmecvuts62dcn87huyruddfd3rj9xk
Discussion
Amber the android signing app: https://github.com/greenart7c3/Amber
by nostr:nprofile1qqs827g8dkd07zjvlhh60csytujgd3l9mz7x807xk3fewge7rwlukxgsl0k9y
Ahh yea. That's slick! Used to sign into nostr:nprofile1qqsx2wyjt6lmvc05rrvv05r5hm3w3t7h0pcpmkyswrpd4ymd2u09tscpvemhxue69uhkv6tvw3jhytnwdaehgu3wwa5kuef0dec82c33wc6h2enedq6xc6m9wdkxw7rcvd3kceecvccxs7np0f5xzaehwfehy6rkvech27r6d5exv6ekx33nwvngwpengdtwxpmr20mzwfhkzerrv9ehg0t5wf6k2qguwaehxw309ahx7um5wgknqvfwvfhkcapwda38xetjwejhyy87u5r 🔥