Daylio

The most popular mood-tracking app globally, Daylio lets you log your mood and activities without writing a single word — just tap icons. Over time, it builds patterns showing which activities correlate with better or worse moods. Therapists love it because clients actually use it (journaling apps have notoriously low retention). The data exports are clean enough for clinical use, and the year-in-review statistics are genuinely illuminating. Sometimes the simplest tool is the most powerful.