iCal was the first calendar application for Mac OS X to offer support for multiple calendars and the ability to intermittently publish/subscribe to calendars on WebDAV servers. Originally released as a free download for Mac OS X v10.2 on September 10, 2002, it was bundled with the operating system as iCal 1.5 with the release of Mac OS X v10.3. The macOS version was known as iCal before the release of OS X Mountain Lion in July 2012. It offers online cloud backup of calendars using Apple's iCloud service, or can synchronize with other calendar services, including Google Calendar and Microsoft Exchange Server. that runs on both the macOS desktop operating system and the iOS mobile operating system. Calendar is a personal calendar app made by Apple Inc.
