Halcyon / Sleep sounds and wind-down
A little sound.
A softer evening.
Mix rain, a fan, or a low wash of noise to suit the room. Set a fade-out timer, settle into a story, or follow a breathing exercise. Halcyon leaves the evening yours.
For iPhone · Halcyon Premium is an auto-renewing subscription. The annual plan offers a 7-day free trial, subject to eligibility. Cancel at least 24 hours before the trial or subscription ends to avoid renewal; manage it in your App Store account settings.
Getting started
One step at a time.
Choose your layers
Select available sounds and set the volume of each one. Free mixes can hold up to three layers; Premium opens the complete 39-sound library with unlimited layers.
Choose how the evening ends
Set a timer that fades the mix to silence, or try a wind-down program. Save a timer with a mix or set a default for when you press play.
Return to something familiar
Save up to two mixes for free. Keep sounds playing with the screen locked, or take a quiet moment with breathing exercises, an available guide, or a story.
Made to be useful.
A mix with room to adjust
Nature, water, noise, comfort, ambience, pulses, and binaural tones make up the full library. Adjust individual sound levels instead of accepting one fixed recording.
More than a sound loop
The full collection includes 10 guides, 20 original stories, and three wind-down programs. Eighteen stories have narration in four voices; The Riverboat includes all four voices without Premium.
Playback that fits your evening
Use background playback, Siri Shortcuts, and optional playback alongside another app. When alongside playback is enabled, Halcyon turns off its Lock Screen controls.
What you get
A clear place to begin.
Included to start
- Available free sounds, up to 3 layers, and 2 saved mixes
- Fade-out sleep timer and background playback
- Breathing exercises and a free selection of guides and stories
- The Riverboat narration in all four voices; file backup and restore
Paid options
- All 39 sounds, unlimited mix layers, and unlimited saved mixes
- All 10 guides and 20 stories; four read-aloud voices for narrated stories beyond The Riverboat
- Deep Descent and Long Night wind-down programs
- Adaptive soundscapes across the whole library
Halcyon Premium is an auto-renewing subscription. The annual plan offers a 7-day free trial, subject to eligibility. Cancel at least 24 hours before the trial or subscription ends to avoid renewal; manage it in your App Store account settings. Local prices and purchase terms are shown in the app before purchase.
Your data, considered
Privacy, in practice.
Mixes, favorites, and settings can be backed up to a file you save or share yourself.
Purchases and entitlement checks use Apple and RevenueCat. App updates use Expo; local activity storage does not mean the app never connects to the internet.
A file backup is a manual action, not a promise of automatic cloud sync.
Read Halcyon’s privacy policyA few things to know.
- Halcyon is for general relaxation and everyday wind-down, not diagnosis or treatment for insomnia or any other condition. Sleep and focus outcomes are not guaranteed.
- Not every story has narration: the released version has 18 narrated stories out of 20. Headphones are recommended for binaural tones, not required for ordinary sound mixes.
- Use a comfortable listening volume. Optional alongside playback changes which app provides Lock Screen controls.