EteSync – Secure and journaled sync for Android
Secure, end-to-end encrypted, and privacy respecting sync for your contacts, calendars, tasks and notes.
EteSync – Secure and journaled sync for Android launched on March 28, 2017 with 41 votes, #822 of 3,481 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 9 years on.
In plain words
EteSync is an Android app that syncs contacts, calendars, tasks, and notes across devices using end-to-end encryption. The app integrates with existing applications so users can maintain their normal workflow while their data remains private and inaccessible even to EteSync itself. Built as open-source software, it allows users to verify the security implementation independently. The synchronization maintains a complete history of data changes.
written from the facts on this page · September 2026
From the sources
Secure, end-to-end encrypted, and privacy respecting sync for your contacts, calendars, tasks and notes. Easy to use and open source - it seamlessly integrates with your existing apps so you won't even notice you are using it! EteSync is very easy to use. Our app seamlessly integrates with your existing apps so you won't even notice you are using it. Security doesn't always have to come at a cost. 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, all of the code is open source . A full history of your data is saved in an encrypted tamper-proof journal which means you can review, replay and revert any…from etesync.com
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Source: Show HN post ↗
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