One Calendar 4+

All calendars in ONE place‪!‬

Code Spark

    • 4.7 • 338 Ratings
    • Free
    • Offers In-App Purchases


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 5.2.2

Fix Yahoo caldav calendar url

Ratings and Reviews

4.7 out of 5
338 Ratings

338 Ratings

SpritelyB ,

Fantastic cross-calendar/device/OS app - THANK YOU!!!!

I rarely write reviews, but feel obliged to write one for this wonderful app that finally solved my calendaring problems that were costing me no end of time and missed appointments. I work mainly on Windows with personal email on Microsoft Exchange accounts and organizational email in Google, and also use two iOS devices. I tried pulling all calendars into my Microsoft account, but synchronization was undependable. I tried an on-line calendar sync service and that immediately altered many appointments in a group calendar — really bad. I spend a lot of time checking one calendar against the other. Finally, this One Calendar app has solved my problems. I consider the price I paid for the Premium version on iOS and another modest fee for the Windows app a small price to pay for all the time it has saved in the few weeks I’ve been using it. Not only that, but the user interface is extremely well thought out, very easy to figure out with good customization options. The month and week views are far better than Outlook or Google IMO. Thank you, thank you, thank you. Keep up the great work!

ChetMG ,

Finally - a calendar which provides applications for my Windows PC, my Mac, and my iOS devices!

I use a Win 11 laptop, an iPhone, an iPad, and a Mac Mini. I used to rely on iCloud for Windows to integrate my Apple calendars with my Microsoft Outlook calendars. Always quirky, it finally stopped working. Now I use this wonderful tool which rapidly presents my Apple, Google, and Outlook calendars and lets me update them from every platform. Love the fact that it doesn’t need a browser, but instead provides native apps for Win, iOS, and Mac OS. Thank you, thank you, thank you - well done!!
Update: I had one intermittent problem in Mac OS. After a couple of e-mail exchanges, the developer figured out the problem, told me what to do, and now it’s fixed. Couldn’t be happier!

Greenone24 ,


The interface is smooth and easy to use. It has the views that I like with a choice of three views for week. You can see the full month in two of the week view for easy glances at future dates. I have been using Awesome Cal for several years. I like the one cal interface much better. One key feature is missing from one cal…the note and task feature. This is the reason for 4 stars. The other feature that Awesome cal as is the ability to star an event that color codes the entire day. I use this feature to highlight the days of a recurring event that I can attend. Example, I attend some basketball games during the season. I subscribe to the calendar so it lists all games. Instead of looking at each game to see when I can attend, I star it so I can easily and quickly see which game I plan to attend. This feature is a nice to have. That key feature may be a deal breaker. I don’t want to maintain two separate apps. Why doesn’t the app let you edit a recurring event after it has been created? You have to delete it and create a new one if you want to make changes.

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 Linked to You

The following data may be collected and linked to your identity:

  • Purchases
  • Contact Info

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

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