EteSync - Secure Data Sync

185 reviews
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About this app

Secure, end-to-end encrypted, and privacy respecting sync for your contacts, calendars, and tasks (using and OpenTasks). For notes, please use the EteSync Notes application.

In order to use this application you need to have an account with EteSync (paid hosting), or run your own instance (free and open source). Check out for more information.

Easy to Use
EteSync is very easy to use. It seamlessly integrates with Android so you won't even notice you are using it. Security doesn't always have to come at a cost.

Secure & Open
Thanks to zero-knowledge end-to-end encryption, not even we can see your data. Don't believe us? You shouldn't, just verify yourself, both the client and server are open source.

Full History
A full history of your data is saved in an encrypted tamper-proof journal which means you can review, replay and revert any changes you have made at any point in time.

How does it work?
EteSync integrates seamlessly with your existing apps. All you need to do is sign up (or run your own instance), install the app, and enter your password. 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. More security, same work-flow.
Updated on
Jan 11, 2021

Data safety

Developers can show information here about how their app collects and uses your data. Learn more about data safety
No information available
185 reviews
A Google user
January 11, 2019
Excellent product and service. Well worth supporting the developer's work by subscribing. I tried rolling my own self-hosted caldav/carddav service using a couple different FOSS applications, but each had quirks I didn't want to deal with. EteSync has worked flawlessly for me, and eliminated the time I'd have to spend maintaining more server-side apps. Thanks for the great product!
28 people found this review helpful
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Kaine Inja
November 30, 2020
I want to like this app on principle, but it just doesnt work properly for me. Set up and initial sync of contacts seems to work fine, can see in contacts app, but after some time the contacts app just shows an empty address book even tho the sync journal shows the contacts have synced & should be there. I have tried clearing data, reinstalling, same thing happens every time. I use a self hosted server rather than the paid service, so maybe this app just doesnt work so well with custom servers.
18 people found this review helpful
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November 30, 2020
Sorry to hear about your issue! This is definitely not how it should work. It has nothing to do with using a self-hosted server as those are essentially identical to the hosted ones. Please come to the chat at we would be happy to help figure out what's wrong!
Damian Królik
December 31, 2021
Maybe I just wasn't patient enough, but I just needed a simple app for notes sharing and I couldn't make it work with EteSync Notes - e.g. I don't understand how collections in EteSync are related to task lists in EteSync Notes but they are not in sync. Perhaps it is just my ignorance, but I expect a more intuitive workflow for such a simple job.
4 people found this review helpful
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What's new

* Import: fix crashes for some users after import finishes.