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 to sync Google calendar, Outlook and Windows 10 calendar apps. I haven't tried it with others. Syncs best if you enter the appointment in One calendar first. It doesn't always pick up entries that you put into other calendars. If you have multiple calendar apps on your phone, tablet or computer, it will result in multiple reminders. I don't know how to get around that. For reminders from OneCalendar you have to go into the calendar entry to change the reminder time. I have not found a simple way to delay the reminder when it appears. If you are out of cell coverage, calendar is slow to load because it cannot sync.

I've been looking for a calendar app that works with my self hosted Nextcloud server (version 29). The app is incredibly easy to use and setup. Very simple GUI which is exactly what I want. I haven't had it long enough to see if the notifications work or not but it does sync without issues to and from my Nextcloud server. Very impressed so far. Also, I looked around the app to see if there is a donate or send me a beer/coffee but didn't see one as I want to send them few bucks.

I have used this for over 5 years. I evaluated 5-8 other calendars by downloading them. This app offered most of the features I found are most often needed. Repeat function doesn't always get the right day of the week. Love the color coding!! 😍 11/23 update: after I changed to a new phone this summer the color coding no longer works without paying, hate that! Want to decrease to 4 stars, but can't!!; 2/24 just discovered i can use color coding again, LOVE IT!! 🥰

What’s new

Minor fixes, CalDAV improvements