Smartphones have become fundamental in our everyday lives. Thanks to the enormous technological advancements of the last twenty years, we can perform a variety of tasks that would be much more complex, if not unfeasible, without them. Unfortunately, this led people to use those devices much more than needed, losing control over them. To contrast this phenomenon, researchers introduced the notion of digital wellbeing and tried to improve it with Digital Self-Control Tools. Those tools guide the user toward more conscious and healthier behaviors, but if not properly calibrated, they may cause reactance, leading to their abandonment. This document will analyze previous research on this field and End-User Development.