We like this timer when playing Rummikub. The fact that each person uses his/her device rather than pass one around is a great feature.
However, the app is called "Mattel clock" at the App Store, but if you forget its name--and you will need its name if a new player joins your game--you won't find it in the app. The app is labeled "timer" on an iPhone, and inside the app it is called "game clock" at the top of the screen. Searching either of these names in the App Store won't get you there.
SO, write "Mattle clock" somewhere on your game.
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