The DelFFi mission is a formation flying demonstration of two triple-unit CubeSats in Low Earth Orbit. It will be part of QB50; 50 CubeSats launched at once to measure the thermosphere between 150 and 300 km.

The DelFFi satellites, called 'Delta' and 'Phi', are based on the Delfi-n3Xt bus platform which will be enhanced by an improved propulsion system, relative navigation and onboard algorithms. Mission analysis is currently being performed and the real development will start soon after Delfi-n3Xt is completed for launch.