# EteSync - Secure Data Sync

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

Canonical page: [https://chrome-stats.com/d/com.etesync.syncadapter](https://chrome-stats.com/d/com.etesync.syncadapter)

## Overview

- **ID:** `com.etesync.syncadapter`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** Tengu
- **Category:** TOOLS
- **Downloads:** 49,133
- **Rating:** 4.31 / 5 (413 ratings)
- **Version:** 2.6.0
- **Last updated:** 2025-10-18
- **First published:** 2017-02-22
- **Publisher country:** GB
- **Size:** 11 MB
- **Data as of:** 2026-09-14
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.etesync.syncadapter)
- **Website:** [https://www.etesync.com](https://www.etesync.com/)
- **Privacy policy:** [https://www.etesync.com/tos/#privacy](https://www.etesync.com/tos/#privacy)

## Description

EteSync is a Chrome extension providing secure, end-to-end encrypted synchronization for contacts, calendars, and tasks. It integrates seamlessly with Android apps like Tasks.org and OpenTasks, enabling users to keep their data private and protected without altering their workflow. Featuring full history tracking, users can review, replay, and revert changes through an encrypted tamper-proof journal. It requires either a paid EteSync account or running your own open-source server. Designed for ease of use and privacy, EteSync secures your data with zero-knowledge encryption, ensuring even the service provider cannot access your information. For note syncing, users can use the separate EteSync Notes application.

With open-source transparency and robust security features, EteSync combines convenience and privacy, allowing seamless secure data sync while respecting user confidentiality. Visit https://www.etesync.com/ for more information and setup details.

## Rankings

- #302,012 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.ACCESS_WIFI_STATE`
- `android.permission.INTERNET`
- `android.permission.POST_NOTIFICATIONS`
- `android.permission.READ_CALENDAR`
- `android.permission.READ_CONTACTS`
- `android.permission.READ_SYNC_SETTINGS`
- `android.permission.READ_SYNC_STATS`
- `android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS`
- `android.permission.WRITE_CALENDAR`
- `android.permission.WRITE_CONTACTS`
- `android.permission.WRITE_SYNC_SETTINGS`
- `org.dmfs.permission.READ_TASKS`
- `org.dmfs.permission.WRITE_TASKS`
- `org.tasks.permission.READ_TASKS`
- `org.tasks.permission.WRITE_TASKS`

## Review summary

EteSync is praised for its strong privacy, encryption, and reliable syncing of contacts and calendars as a Google alternative. Users appreciate developer responsiveness and the ability to self-host. However, repeated issues with payment processing, account creation confirmation links, occasional service outages, and some setup complexities have been noted. The service cost is viewed as somewhat high by a few users. Overall, it provides a valuable secure sync solution, especially for privacy-conscious users willing to navigate initial setup challenges.

### Pros

- Strong privacy and security focus, providing encrypted sync for contacts, calendars, and tasks.
- Reliable and seamless syncing once set up, integrating well with other calendar and contacts apps like Etar and SimpleCalendar.
- Good developer support with quick and helpful responses resolving issues.
- Valued as an alternative to mainstream services like Google Calendar and Contacts, allowing users to avoid mass surveillance.
- Works well both as a paid service and self-hosted solution, saving time compared to self-configured setups.

### Cons

- Payment processing issues leading to subscription and account activation problems.
- Account creation challenges due to expired confirmation links without a resend option.
- Occasional unavailability of service and lack of prompt support responses during outages.
- Some users find initial setup or specific workflows (e.g., syncing notes/collections) confusing or unintuitive.
- The service is considered expensive by some users relative to the features offered.

## Similar extensions and apps

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- [SYNCING.NET - Secure Sync](https://chrome-stats.com/d/com.asbyte.syncingnet) — 2,737 users, 3.40 / 5
- [Enkra Calendar - Task Planner](https://chrome-stats.com/d/io.enkra.calendar) — 43 users
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- [CalendarSync - CalDAV and more](https://chrome-stats.com/d/com.icalparse) — 11,379 users, 3.84 / 5
- [Amplenote](https://chrome-stats.com/d/com.amplenote) — 98,328 users, 4.31 / 5
- [JuSoft Tasks - Todo, Planner](https://chrome-stats.com/d/dev.jusoft.tasks.mobile) — 62 users
- [Outlook-Android Sync](https://chrome-stats.com/d/com.astonsoft.android.outlooksync) — 248,678 users, 3.77 / 5
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- [Hireth: Encrypted To-Do List](https://chrome-stats.com/d/net.hireth.app) — 26 users

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.etesync.syncadapter)