One Calendar

Code Spark

In-app purchases

About this app

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).

Ratings and reviews

Works well and easy to use. I have been using this for over 5 years and this has been a lifesaver for scheduling appointments. So far it has been better than using a paper calendar. When I have to change a date or time it is easy to go in and make the edits without having to erase or even use whiteout. I like that it gives you the option to have the calendar remind you in advance when your appointment starts or when your event is starting.

It's a fine calendar, but there are some usability hurdles. When launching the app by clicking on the widget, it will often launch the app in the last place you left off rather than the event you select on the widget. Also there's no assistance when entering addresses onto events. And to open a map with an event's location, you need to be in edit mode on the event.

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 up dates, that would be so helpful. Everyday 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 everyday to make sure i am not missing any events. 🙏 👍

What’s new

Minor fixes, CalDAV improvements