When it comes to a mobile application, thousands (if not lakhs) of application are available out there on the World Wide Wide to download and use, some of them are paid while some other are available free of cost.
There is so much you can do on your iPhone. From listing to-do-tasks, to setting reminders, checking mails and what not, iPhone is truly a smartphone! iPhone comes with an built-in calendar app but if you want more from your phone’s calendar, downloading and installing a third-party calendar app is the obvious choice in hand.