Fan sounds and a sleep timer, built to feel like a real fan.
Lull is a fan-noise sleep aid for iPhone. Every sound is generated live on your device rather than played from a recording, so nothing loops and nothing repeats over an eight-hour night — the sound keeps drifting the way real moving air does.
Turning the fan up brightens and speeds its character the way a real fan's pitch shifts as the motor works harder. Most fan-noise apps put a fan icon on a volume slider. This one actually changes the timbre — you can hear it at a fixed volume.
There are no audio files in the app. Each sound is synthesized in real time, so there's no seam to notice at the two-minute mark and no download before you can sleep.
Set it and the sound eases out instead of cutting to silence mid-breath. The timer is armed against a fixed end time, so it survives your phone locking, the screen sleeping, or your headphones dozing off first.
Glass surfaces, ambient light that responds to fan speed, and a dim mode — designed for the minute before you close your eyes rather than for browsing. Playback works from the Lock Screen and Control Center, with the remaining timer visible.
Twenty-five and growing. The catalog updates on its own, so new sounds arrive without waiting for an app update.
Fans and machines — Box Fan, Ceiling Fan, Desk Fan, Oscillating Fan, Vintage Fan, Industrial Fan, Turbo Fan, Air Tower, Air Vent, Air Conditioner, Server Room, Deep Hum, Soft Air, Cabin, Sleep Breeze, Open Window
Nature and weather — Distant Rain, Thunderstorm, Storm Wind, Ocean Waves, Night Tide, Waterfall, Mountain Stream, Forest Breeze, Prairie Wind
Two sounds are always free, and the pair rotates on its own, so the catalog isn't a locked wall. Any sound can be unlocked for eight hours by watching a short ad.
Pro unlocks every sound and removes every ad, available as a subscription or a one-time purchase — your choice. There's also a Remove Ads purchase for anyone who just wants the banner gone. Current prices are shown in the app.
No account, ever. There is no sign-in anywhere in Lull, including for purchases.
iPhone running iOS 26 or later. Playback works offline; an internet connection is only used to check for new sounds.
Email davit.ghushchyan@gmail.com, or use "Contact Us" in the app's Settings — it pre-fills your app version, device, and iOS version so we can help faster.
See the Privacy Policy, Terms of Service, and Support & FAQ.