TWENTY ONE Companion The companion app for the TWENTY ONE Portal on Android: meetups, events, courses, lecturers and places — right in your pocket. Meetups & events with a region filter Map of all meetups (OpenStreetMap) Courses & lecturers Group chat on Nostr (NIP-29) with Lightning zaps (NIP-57) Chat notifications without Goolag: your phone checks the relay itself in the background — no Play Services, no second app, no push server in between. Off by default. Built-in wallet: connect Alby / any NWC wallet, send & receive sats Amber offline mode: sign on-device via NIP-55, no round-trips Sign in with Nostr: Amber on-device (NIP-55) or a remote bunker (NIP-46, incl. QR) Offline-ready: the chat is cached on-device, recently loaded data stays available 8 languages: German, English, Spanish, Portuguese, Dutch, Polish, Hungarian, Latvian