Start with Cloud
Prelay Cloud is the hosted zero-knowledge relay. The sender encrypts to your device's key before the request; the hosted relay routes ciphertext and can never read contents.
Create the account
14-day Pro trial, no card required.
Set up the app
Install the Android app and pair it with api.prelay.sh.
Encryption modes
How zero-knowledge works at the protocol level.
How Cloud works
The server, the dashboard, and the databases behind it all run on infrastructure managed by the Prelay team. As a Cloud user you do not get access to this managed infrastructure: there is no shell, no database console, and no server to SSH into. You interact with Prelay through the API, the Android app, and the web dashboard only.
The trade is operations: updates, capacity, and TLS certificates are our job. You never need to trust us with notification contents: envelopes arrive sealed (Mode B) and the server holds no keys, so even the team running the infrastructure cannot read them. The mechanics are in encryption modes.
The managed infrastructure runs on a Hetzner server in Finland, EU.
Cloud keeps the Prelay instance hosted, updated, maintained, and backed up. You never touch configuration files, certificates, or migrations — the dashboard is the whole surface to manage.
Get started with Prelay Cloud
Cloud onboarding flow