Tysha: private messenger

Tysha is a messenger that starts with a name you invented, not with your phone number. NO NUMBER, NO EMAIL, NO PASSWORD An account is a username plus 12 words generated on this iPhone. We never see them and store them nowhere. The other side of that, plainly: lose the words and nobody can restore the account, us included. INTRODUCTIONS BY A ONE-TIME CODE Contacts come only from invitations. The app never reads your address book, there is no people search, and nobody can find you by number - there is nothing to search by. A code stops working once used, or after 15 minutes. ENCRYPTED ON THE DEVICES Messages and calls are encrypted on the phones themselves: libsignal, PQXDH key agreement (X25519 + ML-KEM-1024), Double Ratchet. Keys are created on the phone and never leave it. WHAT THE SERVER GETS A sealed envelope: bytes, size, time and a queue address - a one-way hash of the username that cannot be turned back into a name. It never sees text, files, the sound of a call or an address book. No ads, no third-party analytics, no profiling. WHAT IS INSIDE - disappearing messages, from 30 seconds to four weeks - view once for photos and video - delete for both sides, not just your own copy - voice messages, files up to 8 MB, reactions, replies, edits - voice and video calls, relayed by default so the other side never sees your IP address - small groups with sender keys - a Face ID lock and a wipe after too many wrong codes - your own ringtone, 12- or 24-hour clock, Ukrainian and English WHAT IT COSTS Free: no ads, no in-app purchases, no subscriptions. There are no paid features. WHAT WE DO NOT PROMISE The lock protects the screens; it does not re-encrypt the store. A screenshot notice cannot stop someone photographing the screen. Disappearing messages cannot stop someone copying the text first. Each of these limits is stated inside the app itself. Privacy: https://tysha.cloud/privacy/ Support: https://tysha.cloud/support/