One Calendar is a calendar organizer app that lets you see all your social media events in just one place, saving you time and contributing to your productivity. If you have events or schedules on the calendars of your Google Live, Outlook, iCloud, Exchange, Office 365, and Facebook, then One Calendar will fuse them into just one calendar so you can easily view your dates without having to switch around to each website. It can be read in a simple overview and you can even filter your schedule to see the important ones. You can customize your calendar’s design and also color-code your dates for easy viewing. However, if you want this app to work even normally, you have to upgrade to the premium version immediately, which can be a turn-off for some people.