One Calendar is a productivity app developed by Code Spark.
Download Statistics
One Calendar has been downloaded 1.8 million times. In the last 30 days, the app was downloaded 7.7 thousand times.
User Ratings
One Calendar is rated 4.70 out of 5 stars. The rating is based on 61 thousand ratings.
App Information
One Calendar is FREE to download. The APK download size is 68.45 MB. The latest version available is 6.901.0. The last update was on November 22, 2025.
Technical Requirements
One Calendar requires Android 6.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play April 2018.
Description
The most popular app to view all your calendars like Google, Live, Outlook, iCloud, Exchange, Office365, Yahoo, Nextcloud, Synology, GMX, Mailbox.org, ownCloud and more. OneCalendar integrates all your calendars into an easy-to-read overview. View and manage all your appointments, events and birthdays.
OneCalendar is available on all platforms (Android, iOS, MacOS and Windows).
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Definitely the most reliable calendar app out there. Just one thing would make this app way above others. If you were to add a scrollable day slot in month view instead of putting +2 for more events in one of your next updates, that would be so helpful. Every day has more than 4 events on my calendar. Having to click on the day spot then having to click out of the day spot makes it easy to miss events because I have to click on every day to make sure I am not missing any events. 🙏 👍
★★★★★Dibbles· May 7, 2026
Consistently good, reliable. Recommend. Perfect for multiple shared calendars and work and personal. Better than Outlook and syncs perfectly with Outlook too.
★★★★★Anton Rosenfeld· Jun 28, 2026
I have used this for years. It gives the clearest layout of any calendar app I have seen, about the only one where I really see all my appointments. Easy to use and reliable. I paid a small one off fee so that I could have different colors for different calendars, which was well worth it.
★★★★★Conneh (Connie)· Jun 29, 2026
This app speaks caldav natively, bypassing the entire unreliable device-managed accounts sync and my calendars finally sync properly
★★☆☆☆JJO O· Jun 20, 2026
Font is WAY too small for the month widget view. I can barely read my appointments. I tried changing the font size in the android tablet settings and it didn't change the font at all. Add a setting to adjust the font size in the month widget please.
★☆☆☆☆B P· Jun 16, 2026
Please stop with the annoying feedback reminders. I would have given it 5 stars, but this is for those reminders.
★☆☆☆☆Erin Morash· May 27, 2026
App on Android mobile UI does not connect Google or Microsoft accounts. After having trouble syncing the app on my Android device with the appointments recorded on the app on my laptop, could not reload any of my mobile accounts. I have a paid premium account, and I cannot reload my Google, microsoft calendars to my Android mobile device. There used to be a simple email contact form for malfunctions, but that's gone now too.
★★☆☆☆Brandi White· May 9, 2026
Works really well on phone but will not work on Cozyla. I reached out to customer service and have not gotten anything back. Now I need to find a calendar that will sync with my Outlook calendar
Google Play Rankings for One Calendar
This app is not ranked
Technologies used by One Calendar
One Calendar is requesting 13 permissions and is using 39 libraries.
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