A small, private, end-to-end encrypted messenger. Your keys never leave your device. The relay only ever sees ciphertext.
Unsigned build — Windows may show a SmartScreen prompt; choose “More info → Run anyway”.
Messages are encrypted on your device with a Double-Ratchet protocol. Nobody in the middle — not even the relay — can read them.
Just a keypair generated on first launch. No email, no SMS, no profile to leak.
The relay stores and forwards opaque encrypted blobs. Your keys stay on your device, in your OS keychain.
Compare a safety number out-of-band to confirm who you’re actually talking to. The app makes the difference clear.
If the protocol state ever looks wrong, the app pauses and tells you — it never quietly carries on.
A tiny, deterministic core. No giant framework, no telemetry, no ads.
Yes. Every message is end-to-end encrypted with a Double Ratchet (the same family of protocol pattern used by Signal). The relay only ever transports ciphertext, and your private keys never leave your device.
No. On first launch the app generates a keypair locally. There’s no sign-up, no email, no phone number. You start a conversation by sharing a one-time invite link.
The app checks for new versions and updates itself automatically — you’ll see an “Install & restart” prompt. Updates are cryptographically signed; the app only installs builds signed with the official key.
No. BlatMSG is a small private messenger for trusted friend groups — not a commercial product and not trying to compete with Signal. It uses proven protocol patterns rather than inventing new cryptography.
Coming soon. The core is cross-platform; native Mac and Linux builds are on the way.
Yes — see the GitHub link below.