interval training apps

[CoolC]

Not sure whether to put this here or the gadgets forum, but does anyone use, or can recommend an app I can use for my indoor cycle Training?

Looking through the app store (android) there are loads to choose from, but most seem to be in a format where you can set a number of interval of the same time.

I want to set a number of intervals but of varying times, e.g. 5 minutes warmup then 5 minutes at x cadence, then 1 minute at x cadence in y gear etc.

TIA

[Halb]

GYmboss?

[CoolC]

After looking at what seemed to be every app in the store, i settled on Impetus.

Seems to do what I want, an has pretty good reviews.