and its appearance was designed, in part, by Steve Jobs when Espinosa, flustered by Jobs's dissatisfaction with all of his prototype designs, conceived an application called The Steve Jobs Roll Your Own Calculator Construction Set that allowed Jobs to tailor the look of the calculator to his liking. Its design was maintained with the same basic math operations until the final release of classic Mac OS in 2002. A Dashboard Calculator widget is included in all versions of macOS from Mac OS X Tiger onwards. It only has the basic mode of its desktop counterpart. Since the release of OS X Yosemite, there is also a simple calculator widget available in the notifications area. Since the release of Mac OS X Leopard, simple arithmetic functions can be calculated from Spotlight feature. They include the standard addition, subtraction, division, multiplication, exponentiation and the use of the percent sign to denote percentage. Calendar Calendar is a personal calendar app made by Apple Inc. that runs on both the macOS desktop operating system and the iOS mobile operating system. 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. Chess Apple Chess is a 3D chess game for macOS, developed by Apple Inc. as a fork of GNOME Chess (formerly "glChess"). Its history dates back to OpenStep and Mac OS X 10.2. It supports chess variants such as crazyhouse and suicide chess. Apple redistributes the source code under its own Apple Sample Code License, after a special permission has been granted from the original authors of GNOME Chess (which is licensed under GPL3). Apple ships with the game also the Sjeng chess engine (GPL). Contacts Contacts, called Address Book before OS X Mountain Lion, is a computerized address book included with Apple Inc.'s macOS. It includes various synchronizing capabilities and integrates with other macOS applications and features. Dictionary Dictionary is an application that includes an in-built dictionary and thesaurus. FaceTime FaceTime is a video calling app released by Apple to replace iChat on Mac. Find My First available in macOS Catalina, it tracks location of compatible devices connected via iCloud. Font Book Home Home is the front-end for Apple's HomeKit software framework providing integration with other smart devices. Image Capture Image Capture is an application program from Apple that enables users to upload pictures from digital cameras or