DroneLull - Fan Sleep
Fan & AC Background Sound
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Procedurally generated fan and AC background sounds. 6 presets, layered mixer, sleep timer, fully offline.
DroneLull procedurally generates the warm, mechanical hum of a fan, AC, refrigerator and other household appliances for background masking, relaxation, and steady room ambience. Keep volume low, especially around infants, children, or anyone with hearing sensitivity.
KEY FEATURES
• Procedurally generated audio (no audio files, tiny app size)
• Background playback for longer sessions
• Adjustable master volume
• Live spinning fan blade visualization
• Fully offline — no streaming, no ads, no account
INCLUDED SOUNDS
Free:
• Desk Fan — warm mid-frequency hum
Pro (6 sounds total):
• Stand Fan — slower, deeper rotation
• AC Unit — low-frequency mechanical hum
• Refrigerator — distant kitchen drone
• Vacuum — high-frequency white-pink rush
• Dryer — rhythmic tumbling drone
PRO FEATURES (optional subscription)
• All 6 procedural sounds unlocked
• Multi-layer mixer: blend any combination with independent volume sliders
• Low-pass cutoff fine-tuning (200–3000 Hz) for warmth control
• Sleep timer with smooth fade-out (5/10/15/30/45/60 minutes)
• Background playback can continue during screen lock
• Zero ads forever
HOW IT WORKS
DroneLull synthesizes brown noise (integrated white noise) in real time, applies a one-pole low-pass filter for warmth, and modulates amplitude with a slow LFO to mimic rotating blades. Different presets use different cutoffs and rates to recreate distinct appliance characters. No samples, no recording, no streaming.
PRIVACY
All audio is generated locally. No microphone, no recording, no network. No analytics, no ads, no account.
SUBSCRIPTION INFO
• Payment will be charged to your Apple ID account at confirmation of purchase.
• Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period.
• Your account will be charged for renewal within 24 hours prior to the end of the current period.
• You can manage and cancel your subscriptions by going to App Store → Account → Subscriptions.
Privacy Policy: https://frexx.top/dronelull/privacy.html
Terms of Use: https://frexx.top/dronelull/terms.html
SUPPORT
jie.xiang.jm@gmail.com
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
This update keeps DroneLull focused on calm background sound rather than promised sleep outcomes. The home screen now includes clearer low-volume and safety guidance, fan/AC descriptions are more neutral, and the playback, mixer, sleep timer, and purchase flows have stronger test coverage.
The developer, 杰 向, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 杰 向
- Size
- 597 KB
- Category
- Health & Fitness
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Simplified Chinese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- DroneLull Pro Yearly $29.99
- DroneLull Pro Weekly $4.99
- Copyright
- © 2026 Clawbot