Calm

Calm became a $2 billion company by doing one thing exceptionally well: sleep stories narrated by voices like Matthew McConaughey and Stephen Fry. But beyond the celebrity narration, a 2019 randomized controlled trial found Calm reduced stress by 22% and improved sleep quality significantly over 8 weeks. Therapists recommend it specifically for clients with insomnia and anxiety. The Daily Calm feature — a 10-minute daily meditation — has one of the highest retention rates in the app industry.