SilentSuite

SilentSuite

SilentSuite is an open-source, zero-knowledge sync suite for calendars, contacts, tasks, and other private productivity data. It gives you the convenience of cloud synchronization without giving the server access to the contents of your life.

Your data is encrypted on your device before it is uploaded. The server stores encrypted data, never plaintext, and your encryption keys remain on your devices. This means SilentSuite cannot read, analyze, or monetize your calendar events, address book, or tasks. Privacy is enforced by the architecture, not only promised in a policy.

Key features

• Zero-knowledge, end-to-end encrypted sync: Plaintext stays off the server and encryption keys stay on-device.

• Calendars, contacts, and tasks: Keep essential personal information synchronized across supported devices and applications.

• Works with existing apps: A CalDAV and CardDAV bridge lets you connect compatible calendar, contacts, and task clients instead of forcing you into a closed ecosystem.

• Android and web access: Use SilentSuite from its Android app or web interface, with broader compatibility provided through the bridge.

• Open source: The server, web app, bridge, and self-hosting components are publicly auditable.

• Hosted or self-hosted: Use the managed silentsuite.io service for convenience or deploy SilentSuite on your own infrastructure for greater control.

• Built on proven foundations: SilentSuite continues the Etebase/EteSync open-source lineage, modernized and developed as an accessible privacy-first product.

Use cases

SilentSuite is designed for individuals, families, privacy-conscious professionals, and self-hosters who want to:

• Synchronize calendars without exposing event details to a cloud provider.

• Keep contacts available across devices without feeding an advertising or profiling ecosystem.

• Manage private tasks and personal planning data securely.

• Continue using familiar DAV-compatible applications while adding end-to-end encrypted synchronization.

• Replace proprietary productivity clouds with an open-source alternative.

• Run a private synchronization service on infrastructure they control.

What makes SilentSuite stand out

Most cloud productivity services can technically access the information stored on their servers. SilentSuite takes a different approach, the server is designed not to know what you are storing. Your private data is encrypted before it leaves your device, and only your devices hold the keys needed to decrypt it.

Unlike products that require users to abandon their preferred applications, SilentSuite also supports open standards through its DAV bridge. This combines strong zero-knowledge encryption with the flexibility of existing calendar, contacts, and task clients.