Kantamigo

Kantamigo is an online tool for offline fun. The evening happens in one room with a guitar and the phones are only there for the words. A guest scans a QR code, types a nickname and they're in, no app and no account. The lyrics of the current song scroll on their phone along with the singer, and they can suggest a song and vote for what comes next. The guitarist pastes chord sheets into a private songbook, sets the key and the capo, opens a session and plays. Playing mode scrolls by itself and shows diagrams for the chords you don't know yet. If a friend brought a guitar too, they ask to play, you let them in and you take turns from one queue. What it doesn't do on purpose: there is no song catalogue. You add the songs you play, your songbook stays private, and guests see the lyrics only while the session is live.