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EteSync

End-to-end encrypted sync for contacts and calendars

Calendar & Contacts ★ 1.8k stars Medium setup AGPL-3.0

EteSync is a secure, end-to-end encrypted, and journaled solution for syncing contacts, calendars, and tasks. Data is encrypted on the client so the server never sees plaintext.

Official siteSource code

Key features

  • End-to-end encryption
  • Journaled change history
  • Android and iOS apps

Strengths

  • Released under the AGPL-3.0 license
  • First-class Docker support for quick deployment
  • Active community (1.8k GitHub stars)
  • Written in Python

Is EteSync secure?

OSV.dev has no published security advisories for EteSync's repository. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

Source: OSV.dev, checked 2026-10-14. How this is measured.

EteSync replaces

Self-hosted Google Calendar alternativesSelf-hosted iCloud alternatives

Health badge

Maintain EteSync? Add its health score to your README. The badge links back to this page.

SelfHostIndex: 20 · at risk

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[![SelfHostIndex health score for EteSync](https://selfhostindex.com/badge/etesync.svg)](https://selfhostindex.com/app/etesync/)
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<a href="https://selfhostindex.com/app/etesync/"><img src="https://selfhostindex.com/badge/etesync.svg" alt="SelfHostIndex health score for EteSync"></a>
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.. image:: https://selfhostindex.com/badge/etesync.svg
   :alt: SelfHostIndex health score for EteSync
   :target: https://selfhostindex.com/app/etesync/

The score is recomputed on every nightly rebuild from public repository data — see how it is calculated.

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