ColdBunker
Pre-release. ColdBunker is still being built. Nothing on this site is available to download yet; the pages describe what is coming.
APP · COMMS · Bunker Relay

Relay

Messenger. Encrypted group messaging built on MLS. No phone numbers, no SMS, no address-book upload. Your identity is a key on your device. Ships on Android in v1 too.

A relay passing the message along, like a radio relay.

WHAT IT DOES

In the app

  • One-to-one and group messaging with the MLS protocol.
  • Identity is a key pair generated on your device. No phone number, no email, no contact upload.
  • Attachments, voice notes and reactions, all encrypted before they leave.
  • Android app in v1, so the bunker fits in a pocket.
ICEBOX

What lives in the vault

  • Every conversation, attachment and your identity keys.
Blast door

What leaves your machine

Caution · read this

Encrypted messages. Delivery needs a peer, so Relay sends ciphertext through an Outpost: the hosted one or your own. The Outpost never receives a key and holds no readable content.

What an Outpost can see: which vault ids exchanged how many bytes, and when. We say so plainly on the self-host page.