EteSync - Secure Data Sync
Secure, private and end-to-end encrypted calendar, contacts and tasks sync
App info
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App description
Android App Analysis and Review: EteSync - Secure Data Sync, Developed by Tengu. Listed in Tools Category. Current Version Is 2.5.0, Updated On 20/09/2025 . According to users reviews on Google Play: EteSync - Secure Data Sync. Achieved Over 38 thousand Installs. EteSync - Secure Data Sync Currently Has 389 Reviews, Average Rating 4.3 Stars
Secure, end-to-end encrypted, and privacy respecting sync for your contacts, calendars, and tasks (using Tasks.org 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 https://www.etesync.com/ for more information.
Easy to Use
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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
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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
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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?
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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.
We are currently offering version 2.5.0. This is our latest, most optimized version. It is suitable for many different devices. Free download directly apk from the Google Play Store or other versions we're hosting. Moreover, you can download without registration and no login required.
We have more than 2000+ available devices for Samsung, Xiaomi, Huawei, Oppo, Vivo, Motorola, LG, Google, OnePlus, Sony, Tablet ... with so many options, it’s easy for you to choose games or software that fit your device.
It can come in handy if there are any country restrictions or any restrictions from the side of your device on the Google App Store.
What's New
* Remove unused READ_MEDIA_IMAGES permission.
* Fix build with latest Android SDKs
* Bump target SDK
* Fix build with latest Android SDKs
* Bump target SDK
Rate and review on Google Play store
Total number of installs (*estimated)
Estimation of total number of installs on Google Play, Approximated from number of ratings and install bounds achieved on Google Play.
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Recent Comments
Alicia Sykes
One t set up, EteSync works really well, you don't even notice it's there. It's considerably more private and secure than using Google Calendar, or another mainstream unencrypted provider. You can use almost any calendar app with it (I use SimpleCalendar, which is open source and works well). EteSync is 100% definitely worth spending a couple dollars on, or installing on your home server. I recommend it to all my friends, 5 Stars
Kaine Inja
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.
Damian Królik
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.
LetsGoBrandon FJB
Nice app to sync your contacts, calender, and notes. Want to get away from Google, this is the application for you. Huge drawback is the payment setup..it is frustrating and not an easy process. Overall, well worth it and getting away from Google is a huge plus.
A Google user
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!
Finding.Filene
Very excited this app and service exists. I'll be signing up for the free two week trial to see what I think. Replacing my contacts and calendars? Encrypted end to end? Wow. I love it!!
Simo “Sim”
It's impossible to create an account. They send you an email confirmation link and within seconds it's expired? There's no option to resend either. Lol.
Galaxy A32 5G
One of a kind. There is nothing like it on the market. I am testing it and so far it works well. Even got it to sync with outlook desktop client. If all goes well I'll become paid user in a week or two.