No phone number
Signing up asks for no number, no email, no password. You invent a name, and it is tied to nothing.
+1 202 555 0147×
olena@mail.com×
@olena_ka name you made up
iPhone · iPad · free
Nobody finds you here
No number, no address book, no people search. Only someone you gave a code can knock.
Messages and calls are encrypted on your devices. The server gets a sealed envelope.
Get Tysha
The chat listA conversation with a documentView once: openedClosed - and already goneA call through the relay
PeopleFor you and your circleNo number, no search, introductions by code, chats behind Face ID, calls that hide your address.What it does →CompaniesFor teams and organisationsA channel for conversations that must not sit on someone else's server in plain text. Pilot, own server, console - in development.For companies →SecurityHow it is builtlibsignal encryption, what the server sees and does not, where it runs and what we harden next.About security →
What it is
A messenger with no way in except an invitation you gave
Six things worth knowing before you install it - including who it is not for. Better to find that out now.
Nobody finds you by search
There is no people search as a mechanism. The only way to you is a code you handed out yourself: scanned in person or sent whichever way suits you.
Olena
There is no people search in Tysha
Introductions by one-time code
A QR, a link or 26 characters. It lives 15 minutes, works once - and goes out.
the code lives 15 minutes and works once
Encrypted on the devices
The engine is libsignal, the same one Signal uses, studied by independent cryptographers for years. Keys are created on the phone, the handshake is PQXDH (X25519 with ML-KEM-1024), and Double Ratchet changes the key for every message. Brute-forcing such a key is beyond both the supercomputers of today and the quantum one that does not exist yet: it would take longer than the universe has existed. The server only ever gets a sealed envelope.
Free
The app is free right now and has no paid features yet. Honestly.
Third-party analytics
Profiling
iPhone and iPad
Tysha runs on iPhone and iPad with iOS 18 - up to five devices per account. Mac is in App Store review; Android and Windows are in testing.
Download
Phone, tablet and computer - one account
A second device joins your account with a code from the main one. Each device has its own keys, and they never leave it. A linked device can be unlinked at any time.
iOS 18 or later
iPadOS 18 or later
macOS 26 or later · in App Store review
in testing · soon
in testing · soon