The guiding principle behind the Unix command line lurking underneath the GUI of every Mac you own is a collection of simple programs that co-operate to enable you to achieve complex tasks. That co-operation part is missing from iOS, due to tight app sandboxing, but the idea of simple, small apps that do one thing well is very much alive. The latest from this school of design thought is App Cubby’s $0.99 app, Timer.

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Timer: a single-serving iPhone app for timing stuff