Mobile app · Security & privacy

EteSync - Secure Data Sync

Secure, private and end-to-end encrypted calendar, contacts and tasks sync.

Completely free
Android
Open source

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Completely freeconfirmed by F-Droid
License: GPL-3.0 — Open source (copyleft)confirmed by F-Droid
Open source: Yes
Commercial use: Yesconfirmed by F-Droid
Account required: not documented
Credit card required: Noconfirmed by F-Droid
Watermark: Not applicable
Ads: No
Platforms: AndroidEstablished by Android: F-Droid
Latest version: 2.7.0 (9 March 2026)
Latest activity: 9 March 2026
Source code: github.com/etesync/android

Overview

EteSync - Secure Data Sync is a note-taking mobile app, available on Android.

Features described in its F-Droid listing, in its GitHub repository and on its official website: end-to-end encryption and data encryption.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“Secure, end-to-end encrypted, and privacy respecting sync for your contacts, calendars, tasks and notes.” — official website, 10 November 2026
“For notes, please use the EteSync Notes application.” — F-Droid, 10 November 2026
“After that, you will be able to save your contacts, calendar events and tasks to EteSync using your existing Android apps, and EteSync will transparently encrypt your data and update the change journal in the background.” — F-Droid, 10 November 2026

At a glance

All of EteSync - Secure Data Sync is free: no feature is locked behind a paid plan, and its code is open.

Its licence (GPL-3.0) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
No advertising
Commercial use allowed

Sources and checks

Facts collected from F-Droid (credit card, source code, licence, free status, platforms, ads, commercial use, version) — 6 November 2026
Last technical check: 6 November 2026
Description from F-Droid — F-Droid (citation courte)

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