Tysha: private messenger

Tysha is a messenger that starts with a nickname you invented, not with your phone number. Get it while it is free - the free ride will not last forever.

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. There is another side to that: 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: the libsignal library, 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 - 32 random bytes with no link to your username. 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 64 MB, reactions, replies, edits
• voice and video calls: relayed by default, so the other side never sees your IP address
• group calls for up to five people, each pair encrypted separately
• 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 for now. No ads, no in-app purchases, no subscriptions. So get it while the ride is free - it will not stay free forever.

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/en/privacy/ Support: https://tysha.cloud/en/support/