Etar - OpenSource Calendar was until recently, my primary calendar because it supports Calendaring Extensions for WebDAV ("CalDAV")... And in this respect, Etar - OpenSource Calendar still works quite well. I have however, switched to Simple Calendar (also Open Source) because it requests access to fewer permissions and I prefer the design. This is not to say that Etar - OpenSource Calendar is a bad application, just that I prefer Simple Calendar. If you want something to replace Google Calendar or whatever came with your mobile device, my first recommendation would be Simple Calendar, followed closely by this... But don't take my word for it - install both and see which you prefer!
Easily the cleanest and most functional calendar app I've used so far. Ability to simultaneously display a second date other than the Gregorian like Hijri or Hebrew would be great!
This app is so much more user-friendly than Google's calendar. The simple design is great and it's open source! I've been checking out alternatives for Google apps and this is the best calendar I've found. I would recommend it to everyone.
Smart looking and effective calendar app. Syncs with all my various Google calendars.
Simple and clean. Works well and is a great sunrise replacement
Etar is a straightforward open source calendar. It works like the AOSP calendar with the ability to write in events and sync to other services. The additional features compared to the stock AOSP are a cleaner design and some night mode features for those who want it. Overall it's an easy to use calendar with a clean design that works like the AOSP calendar.
What's New in v1.0.12:
★ Request permissions at runtime on Android 6 upwards.
★ Fix crash at startup.
★ Allow user to squeeze display so that whole day is visible.
★ Set seconds to zero when creating a new event.
★ Minor Layout fixes.
★ Lots of bug fixes.
★ Support sharing calendars via ics and the ability to import/export from sdcard.
★ Remove unused permissions.
★ Fix sound setting on Android 6.
★ Lots of Bug fixes.