ProtonSync brings your Proton Contacts and Proton Calendar into Android's native apps the dialer, lock screen, smartwatch, and every calendar app. No Google account required.
Built for people who chose Proton for their privacy and want that same privacy on the rest of their phone.
Changes flow both ways between Proton Contacts and the Android Contacts provider. Add a contact anywhere, it's everywhere.
Your Proton Calendar events appear in every calendar app on your phone, widgets included. Never miss a meeting again.
User, address, and calendar keys are unlocked locally. Decrypted data never leaves your phone unencrypted.
Synced contacts and events are written only to Android's system providers no cloud backup of decrypted data, ever.
Built-in logging gives you full transparency into what was synced, when, and why. Debug everything yourself.
Zero third-party analytics. No ads, no data mining. Just an app that does one job and respects you.
No complicated setup, no servers to configure. Sign in and flip a switch.
Log in with your Proton account credentials. Keys are unlocked locally on your device.
Toggle Contacts, Calendar, or both. You're always in control of what gets synced.
ProtonSync decrypts and writes to Android's native providers. Check the sync logs for details.
Every design decision in ProtonSync puts your data's confidentiality first.
Cryptography on-device. All key unlocking and decryption happens on your phone.
Third-party analytics or trackers included in the app.
Fully open source. Audit the code, open issues, or fork it it's yours.
Grab the latest APK from GitHub releases, or build it yourself from source.
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