EteSync – Secure Data Sync - Interview with the developer of a fantastic app

Did you have any prior development or coding experience?

Yes, I’ve been coding since I was 9 years old, worked as an engineer at large companies, and have built multiple apps prior to this one.

What was the most challenging aspect of developing mobile app?

Since EteSync as end-to-end encrypted and privacy-respecting, we don’t track our users and can’t access their data. This is a good thing, and why our users love us, but it also makes debugging very hard at times.

EteSync was created by Tom, aka tasn, because he was frustrated with the lack of secure solutions for contacts and calendar sync or even backup. For a short while, there was Flock by the people behind Signal, but unfortunately, it didn't last long. Tom, as a long time open source contributor, privacy fanatic, and previously a lead developer for SHR, the biggest Openmoko (the freest phone to have existed so far), decided to take matters to his own hands and create EteSync.

Name a few of your favorite apps and reason you love them. – the best tasks (to-do list) app out there!
Etar – an open-source calendar app, is one of my favorites because I live in my calendar and it’s the only app I found with a decent monthly view.
VLC – the world-famous media player.

How long have you been working on this app?

Roughly 3.5 years.

What need of the user did you have in mind when developing this app?

Data privacy. We live in a world where our data is used to track, analyze, and manipulate us. EteSync was created to enable users to protect themselves and their data. I initially built it for myself and decided to release it to the public when I realised others will find it useful too.

In what way do you think your app is better than similar apps on the market? Please describe in detail what innovation you think you bring and what you are proud of in your app.

We are the only app that lets you end-to-end encrypt your data. This means that only when you use EteSync your data is saved to “the cloud” in a way that you, and only you, can access it.

What are your future plans and expected features of the coming new versions of this app?

We recently released an iOS version of the app. We plan on adding more data types that our users are asking us to add, such as notes.

Assuming new users of your app are reading this page. What do you want to ask them to do (contact you about X, Share the app, etc.)?

Please let us known if you think there’s anything we are not doing as well as we should. We are very user centric, and listen to feedback. So don’t hesitate to contact us! You can also join our community chat at

EteSync – Secure Data Sync

About App:

Secure, end-to-end encrypted, and privacy-respecting sync for Android, the desktop and the web. Currently supports calendars, contacts, and tasks (using OpenTasks), with more on the way.
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 sourced.

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.

Categories: Tools

Date: May 11, 2020

Developer: Tom Hacohen

About developer: EteSync was created by Tom, aka tasn, because he was frustrated with the lac ... Read more



App URL in iTunes
App URL in Google Play


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