One Calendar

• OneCalendar premium — $5.99

Last verified 30 Aug 2026

4.8 20584 ratings · App Store

1. 5/5Exactly what I was looking for . . .

   I've tried many calendar and planner apps in the past and have not been completely satisfied. When I stumbled across this one I was pleasantly surprised. It is a simple calendar, but does all the things I ask of a calendar without complicated, unwanted options getting in my way. What I needed was an app that I could sync with my Google calendar and this one works perfectly, not only syncing but apparently doing so real time. I make changes to this calendar and the changes are there in my Google calendar and the reverse is true. I could also sync to other calendars, Outlook for instance, but am not doing that now because I want to keep it simple. My only compaint, if it really is one, is that there doesn't seem to be a way that I can check to see if I have a regular version or a paid version with more features. For what I need it for I would gladly pay. An answer to this from the developer would be appreciated. All in all I am very happy I found this app.

   fred12345965 · 30 Aug 2026

2. 5/5Very clear, easy to use, no-nonsense

   My main interest in this app was the basic calendar view - I'm very visual so I like to have my appointments clearly color-coded. Specifically, a large colored bar across the whole event is ideal, vs. the tiny dot that most apps, including Apple's, favor. This is truly a no-frills app that was easy to sync with my accounts/phone etc, and which would be easier to learn and use for those who are low-tech. You can set reminders and have notes and all that too, but its not grinding your coffee in the morning and posting your life on Instagram. Admittedly, I would welcome a few more options to tweak it's appearance, such as font size, etc. but everyone will have their preferences and nit-picks no matter how how good an app is. This deserves 5 stars for reliably doing exactly what it is designed to do in a logical, very easy-to-use format.

   Jerzjazz · 30 Aug 2026

3. 4/5The best Calendar app

   I decided to come do a review for this app for two reasons, number one is that it is one of the best calendars I’ve ever used since the modern cell phone/app tools have become mainstream in all of our lives. The user interface is super simple. Everything about this calendar is enormously, simple and very easily integrated into my daily work, habits and schedule. The only is that you cannot copy and paste phone numbers or addresses on the phone app. You can do it on the desktop but not on the mobile app. Why is this an issue? Because if you need to call a customer or text a customer you cannot copy and paste the number. If you need to add the address Somewhere, you cannot copy and paste the address. I think these are the only two things I’ve ever seen that I would ask your company to address other than that. There is simply no other calendar that I’ve used, and I’ve used salesforce and many other work calendars, none of them work as well as this calendar. Thanks.

   S. W. Biddulph · 30 Aug 2026

4. 5/5The Best

   I have tried several calendar apps with all the bells and whistles. One Calendar is the best for my needs. It has the best monthly calendar view that clearly shows all my events with color tags to help keep me organized. Its user options are simple to make changes in settings. The only minor note I have is the developer doesn’t reply right away to questions or troubleshoot issues with the app. The developer doesn’t have an automatic reply message system with a time frame for their reply. Usually the glitches in the app occurs when Apple has updated its iOS. The developer should know that good customer support equals a good customer experience.

   iMr R · 30 Aug 2026

5. 4/5Almost

   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.

   new paper · 30 Aug 2026

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