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GBCal is an independent calculator app you can use on your Apple Watch.O You can enter number by slip and touch gestures. - 1: down slip - 2: 1 touch after down slip - 3: 2 touches after down slipO Clear number from label - slip left: one number - slip right: all numbers O Also number can be inputted by slip and consecutive slip. - 1: slip down - 2: slip right and down consecutively - 3: slip left and down consecutively