Platforms: iOS, Mac OS, Android OS, web browser Google Calendar – Desktop View Most suitable for: Anyone using G Suite for Business, or using Google apps regularly. Google Calendar is free, easy to use, and allows you to plan your life, seamlessly, across all your devices. The best calendar app for GSuite users & in-general use Final Thoughts on Choosing the Best Calendar Appīest Calendar Apps of 2021 for Windows, Mac, iOS & AndroidĬheck out our list of the best calendar apps below, and find out which ones are best suited to your personal needs.Best Calendar Apps of 2021 for Windows, Mac, iOS & Android.