Sorry to have missed this in a quick search. The Apple App Store does not list a product for a chess or go clock for the iPad or iPhone. Seems odd. I must have missed something obvious.

Oh.
Nevermind. I found dozens of chess clocks at the iTunes App Store. Searching the stores for "Go clocks" returns weird results but I suppose one or more of the chess utilities will adapt to go rules.

Silly me.

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David Bogie, Boise ID
I play go, I ride a recumbent, of course I use Macintosh.

For IPhone, Game Timer has free "Canadian Overtime" while GameClock seems to have the most complete selection of modes (including Fischer and bronstein). Both have paid Japanese byo-yomi.

I haven't paid for either upgrade or used either in a real game. So I don't know How either handles move counts in overtime or multiple overtime. Both can be downloaded and tested in "sudden death" mode.

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Founder, Central Mississippi Go Club
Free tips and resources for clubs and teaching
Go Kit Club Pack - pack of 13x13 go sets for clubs
Go Tin - very portable go