Decibly: Noise Log & dB Meter
Noisy Neighbor Complaint Diary
$0.29 · Designed for iPad. Not verified for macOS.
Noisy neighbors? Measure in dB, log every spike through the night and export a one-page PDF noise report as proof. Pay once — no ads, no subscription.
Decibly turns your iPhone into a sound level meter that looks and feels like a real instrument: a large analog gauge with an amber needle, the live reading in crisp numerals, and color zones for quiet, moderate and loud.
MEASURE
• Live A-weighted decibel reading (dBA), updated 20 times a second
• Min, average (Leq) and max for the running session
• Scrolling chart of the last 60 seconds
• Reference points: 30 whisper · 60 conversation · 80 traffic · 100 danger
KEEP THE PROOF
• Start/Stop sessions with time, duration, min / avg / max and an optional note ("neighbors drilling", "night shift, hall 3")
• History with mini stats and a full chart for every session
• Export any session as a one-page PDF report or a CSV file
UNDERSTAND
• Exposure indicator with NIOSH-style guidance computed from the session average (e.g. about 8 h at 85 dB, about 15 min at 100 dB) — informational only
• Calibration slider (−15 … +15 dB) to match a reference meter
LIVE, EVERYWHERE
• Live Activity: the current level, zone color and elapsed time in the Dynamic Island and on the Lock Screen while a session runs
• Lock Screen "Measure" widget that starts a session with one tap; Home Screen widget with your last peak
NOISE ALARM & SCENES
• Set a threshold (default 70 dBA) — every excursion gets a haptic pulse and is logged with time and peak
• Scenes: Baby room ≤ 40, Bedroom ≤ 35, Office ≤ 55, Street, Concert — one tap sets the alarm and gives a verdict such as "OK for sleep" or "Too loud"
• "Sounds like…" under the readout: whisper, quiet library, rain, conversation, vacuum cleaner, city traffic, lawn mower, motorcycle, concert, siren
EVIDENCE REPORT
• One-page Noise Report PDF with device model, iOS version, calibration, start/end, min / avg / max, the strip chart with alarm markers, every event and your note
• Shareable summary card image with the peak, date and note
PRIVATE BY DESIGN
• Audio is never recorded, stored or transmitted — the microphone signal becomes a number and is discarded instantly
• No accounts, no analytics, no ads, no location, no network
• Everything stays on your iPhone
PAY ONCE
• Every feature is included. No subscriptions, no in-app purchases, no "Pro" version.
Also: two alternate app icons, 8 languages, light and dark theme.
Decibly is not a certified measuring instrument; readings are approximate and depend on your device's microphone. The exposure indicator is general guidance, not medical advice.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Minor fixes. “Rate Decibly” in Settings now opens the App Store review page.
The developer, Denys Khomenko, 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
- Denys Khomenko
- Size
- 5.4 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 7 more
- English, French, German, Italian, Korean, Portuguese, Spanish, Ukrainian
- Age Rating
4+
- 4+
- Copyright
- © 2026 Denys Khomenko
