The most popular app to view all your calendars like Google, Live, Outlook, iCloud, Exchange, Office365, Yahoo, Nextcloud, Synology, GMX,, ownCloud and more. OneCalendar integrates all your calendars into an easy-to-read overview. View and manage all your appointments, events and birthdays.

What’s New

Version 3.7.2

Share an appointment, support for multiple iCloud/CalDav accounts, new options like appointment length, iCloud/CalDav background sync interval and more.

Ratings and Reviews

4.6 out of 5
142 Ratings

142 Ratings

Andresito R ,

Amazing to centralize calendars across devices

I use Microsoft Exchange for work, Google for personal life and follow other calendars (e.g. church, holidays). I heavily use my calendar for task management keeping them as all-day events that I constantly drag and drop to block time in my calendar to work on tasks, or to put them back as all-day events. I use iPhone, iPad and Windows 10. I’ve tried TONS of calendars to centralize all of them, such as Apple’s, Google’s, Calendars 5, Outlook’s, etc. None of those calendars managed drag and drop of events easily and the views were not good. One Calendar is GREAT. I have the free version for iPhone and iPad, and purchased premium for Windows 10.

Scott1155 ,

Random Repeatable Crashes iPhone 12 Pro

iPhone 12 Pro, iOS 14.4 - One Calendar crashes at random times when I switch between viewing modes (list, day, week, month, year). The crash is random but very repeatable and easy to duplicate. A few days ago I sent crash information (screenshot and crash log dump) to the developer but have not received any response whatsoever. When the app doesn’t crash it works alright for a free app. Hopefully the developer will act on the crash information that I provided. ***UPDATE*** Still no response from developer or any update to the app. I could not handle the crashes with the app as they were too frequent. I uninstalled the app and reinstalled the app in an attempt to resolve the crashing issue. Now the app wants to charge me $4.99 to go premium just to gain the features back that I had before. NO WAY will I pay $4.99 for an app that crashes when I change viewing mode. I have moved over to Google Calendar as it has plenty of features and works without crashing. Bye, bye One Calendar!

new paper ,


According to my wife I am totally obsessed with Calendar apps on my iPhone. I have looked at several different ones looking for the perfect app and this one seems to come as close as any I have used. The thing I like is a calendar that has a full month calendar where you can see each day and what’s going on. Not like the one that everyone seems to like where it has a Calendar and then underneath it has a list of things coming up. I like to look at it like he would look at a calendar on your wall. The two things I wish this calendar app dad was showing the actual date in the app icon on my screen, and a wider selection of themes or letting me use one of my own photos. But that’s only for someone who is totally obsessed with Calendar apps.

App Privacy

The developer, Code Spark, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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