Open Sync

3.6
575 reviews
100K+
Downloads
Content rating
Everyone
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About this app

OpenSync is a Open Source CalDAV/CardDAV (Contacts and Calendars) Sync for Android.
its integrates natively in Android calendar/contact apps.
its a fork from opensource project DavDroid https://davdroid.bitfire.at/source/.
it has been tested with Nextcloud Server.

OpenSync Source code is at https://github.com/deependhulla/opensync and on https://deependhulla.com/android-apps/opensync-app

Its licensed under the GPLv3 License.
Updated on
Apr 18, 2017

Data safety

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3.6
575 reviews
A Google user
February 12, 2019
This app is almost perfect. It works seamlessly with Nextcloud, and I can sync contacts, calendar entries and can also sync tasks with the help of Open Task (separate app). So why do I give it only three stars? It saps your battery dry in a few hours if left unchecked, even with the conservative-looking default 240 minute sync settings. My Moto G4 normally lasts almost 36 hours on a charge, with this app that goes down to 4 hours max. Fix the power drain, and this app deserves 5 stars. As it is, I sadly find it unusable.
31 people found this review helpful
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Laurent Marandet
July 27, 2021
Works perfectly with Baikal Server (both carddav and caldav). I just had to add two accounts because the url is different in my server for caldav and carddav. Before I used CalDav Sync and Carddav Sync which were unsupported without notice for paid users. OpenSync is a great improvement and is free of charge. I cannot understand why Google does not support dav protocols out of the box (like Apple). I think that they want to stuck people with their gmail apps and pump all the private datas.
15 people found this review helpful
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A Google user
November 7, 2018
It never asks for permission to access contacts and calendar. So if you don't change the settings manually nothing happens. Frustrating. But it's free and works so whatever.
13 people found this review helpful
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What's new

First Release with Next Cloud