The mytaxi app does the same and does it for regular cabs. It's also been around Berlin much longer. I never had any problems finding a cab anywhere in Berlin a

The mytaxi app does the same and does it for regular cabs. It's also been around Berlin much longer. I never had any problems finding a cab anywhere in Berlin at any given time. Open app, klick "need a ride", cab arrives a few minutes later. No surge pricing.