Happify

Happify is a self-guided app that aims to increase positive emotions through exercises and games supported by positive psychology and mindfulness research. An initial questionnaire is used to suggest "tracks" for an individual's use, and subsequent activity content is geared towards various aims such as reducing worry, building relationships, increasing fitness, or coping with chronic pain. Activities are backed up with a blurb about research or scientific rationale that the user is encouraged to read. It is free with paid upgrades.