In 2012 I developed an app for the Dutch dating website Paiq.nl with a very early Sony Smartwatch and Android. It matched up users that were close to each other if they had fitting online profiles. It was a trial to bring online dating in the physical world. Users were guided with vibrations from the watch and could share their heartbeat.
Redesign of the interface for a mirrorless camera. Usability Evaluation in multiple iterations. Test subjects were significantly better with solving the tasks and enjoyed the improved interface in this A-B test.