Mental health is a popular topic for smartphone apps, with as many as 20 thousand apps of varying quality on the market. Mental or behavioral health is a broad category, including everything from live online therapy sessions, to coaching and meditation apps, to habit trackers, step counters, and productivity tools. The COVID-19 pandemic increased public attention to mental health, generating even more interest in these tools. But which ones are best? This post will square off several interesting apps against one another. I'll note up front that my list doesn't include any (a) apps like BetterHelp or Talkspace that let the user connect with a live therapist , or (b) apps that include direct biofeedback from a sensor like the MUSE Monitor EEG headband or HeartMath HRV sensor (but see a different post about that type of sensor-integrated app here ). Mental and behavioral health smartphone apps seem to fall into several broad categories, offering different types of support: Ca...