Contastic is a self-hosted, end-to-end encrypted contact sharing platform. Your data stays private — always.
Get the App Learn MoreTraditional address books sync your contacts to third-party servers. Contastic keeps you in control.
Private contact data is encrypted on your device before it ever leaves. The server only stores encrypted blobs it cannot read.
Run your own Contastic server in minutes using Docker. No accounts with third-party companies required.
You choose who can see your contact details and exactly which fields to share — per subscriber.
Native Android app syncs contacts to your address book. Web client works in any browser.
Simple for users. Zero-knowledge for the server.
When you sign up, an RSA key pair is generated locally in your browser or on your phone. Your private key never leaves your device.
Fill in your name, phone, address, or any vCard fields you like. Mark each field as public or private.
Others scan your QR code (or search by email) to find you and request access to your private data.
Review subscription requests and choose exactly which private fields to share with each person. Data is encrypted client-side with their public key.
Install the Android app or try the web client on our staging server.
Download Now