Science-backed sleep music that adapts to your body. Seamless crossfades, heart rate tuning, and offline playback. Fall asleep faster, stay asleep longer.
Dual-player audio engine crossfades between tracks so music never stops or startles you awake. Eight-second blends, zero silence gaps.
Syncs with Apple Watch to read your resting heart rate and selects tracks with BPM below your baseline, naturally guiding your body toward deeper relaxation.
Moves through awake, light, deep, and REM phases on scientifically-timed intervals. The music adapts to where you are in your sleep cycle.
Set a fade duration from 15 to 90 minutes. Volume decreases imperceptibly so the music is gone by the time you're deep asleep.
Save tracks for offline playback. No WiFi needed, no buffering mid-dream. Your sleep session works even in airplane mode.
Heart tracks during sessions to build a personal library. Rate, search, sort, and rediscover the sounds that work best for you.
Pick a length from 25 to 400 tracks. Set your bedtime, fade duration, and orb visual style.
The engine handles everything. Crossfades, phase transitions, and volume fade all happen automatically.
Review your session stats, rate your sleep quality, and watch your sleep patterns improve over time.
Every feature is grounded in sleep research
Free to download. No subscription. No ads. Just sleep.
Download for iOS