Decibels: Sound Level dB Meter
Noise, SPL & Spectrum Analyzer
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Loud neighbor? Noisy workshop? Decibels is a calibrated sound level meter with night mode, evidence clips and a spectrum analyzer. No ads, no tracking, nothing uploaded.
How loud is it, really? The neighbor's bass at 2 a.m. The workshop that leaves your ears ringing. Decibels gives you a number you can trust — and, when you need it, the evidence to back it up.
Decibels is a precision sound level meter built like a real instrument: the IEC 61672 mathematics professionals use, per-device calibration verified against a laboratory-validated reference, and a design that shows what the noise is doing, not just how loud it is.
A · C · Z WEIGHTING · FAST · SLOW · IMPULSE · Leq · LCpeak · SEL
THE REAL MATHS, IN A REAL METER.
MEASURE LIKE AN INSTRUMENT
Every reading is a true IEC-weighted level. Choose A, C or Z weighting and Fast, Slow or Impulse response. Sessions record the energy-averaged Leq, the loudest moment, the C-weighted peak, sound exposure level (SEL) and the L10, L50 and L90 statistical levels used in environmental noise reports. An overload lamp shows when the microphone is clipping, and readings below the microphone's own floor are flagged, not faked. Fine-tune against any reference meter with the built-in guide.
SEE WHAT THE NOISE IS
A number says it's loud; the spectrum says it's a fridge compressor, a bass line or a siren. Switch the meter to a live FFT spectrum analyzer, 1/3-octave bands, or a scrolling spectrogram waterfall that paints frequency against time and identifies a sound by its shape.
NIGHT MODE
Start it at bedtime, set your wake-up time, and put the phone down. In the morning a quiet-hours report shows your night hour by hour: how quiet it was, when the loud moments happened, and how loud they were. Light on battery.
KEEP THE EVIDENCE
Set a threshold and get notified when noise crosses it. Turn on Evidence Clips and Decibels saves a 30-second recording around each event — 10 seconds before, 20 after — stored only on your phone, playable from the session, and shared only when you choose. Built for noise complaints.
PROTECT YOUR HEARING
An exposure dosimeter tracks your daily noise dose against NIOSH, OSHA and EU 2003/10/EC limits: dose percentage, time-weighted average and safe time remaining at the current level. Export sessions to Apple Health as environmental audio exposure.
ALWAYS WITHIN REACH
A Live Activity keeps the meter on your Lock Screen and in the Dynamic Island while you record, Stop button included. Widgets show your last reading and today's dose. Share a session card in one tap, or export CSV data and PDF reports.
PRIVATE BY DESIGN
No ads. No tracking. No analytics. Audio is analysed on your device and never leaves it unless you share a clip or card yourself. Evidence Clips are off by default and require explicit consent.
FREE
- Live meter with A/C/Z weighting, Fast/Slow/Impulse response
- Leq, Max, Min, C-weighted peak and overload indicator
- Calibration trim and reference-meter guide
- Sessions with chart, notes, tags and location (last 10)
- One threshold alert
- Live Activity, widgets, light and dark themes
DECIBELS PRO
- Unlimited session history
- Spectrum analyzer, 1/3-octave bands and spectrogram waterfall
- Night mode with quiet-hours reports
- Evidence Clips
- Exposure dosimeter (NIOSH · OSHA · EU) and Apple Health export
- CSV and PDF export, share cards
Decibels Pro is available as a yearly subscription or a one-time lifetime purchase.
Payment is charged to your Apple ID account at confirmation of purchase. Subscriptions automatically renew unless cancelled 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 subscriptions in your Apple ID account settings. Any unused portion of a free trial period will be forfeited when purchasing a subscription.
Privacy Policy: https://realvision.app/privacy-policy/
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
Decibels 2.0 is a ground-up rebuild.
- A real instrument: A/C/Z weighting, Fast/Slow/Impulse response, Leq, C-weighted peak, SEL and L10/L50/L90
- Per-device calibration, verified against a laboratory-validated reference
- Spectrum analyzer, 1/3-octave bands and a spectrogram waterfall
- Night mode with a morning quiet-hours report
- Threshold alerts and opt-in Evidence Clips
- Exposure dosimeter (NIOSH · OSHA · EU) with Apple Health export
- Live Activity, widgets, share cards, CSV and PDF export
- No ads, no tracking — audio never leaves your phone
Existing subscribers keep full access. Earlier saved readings from version 1 aren't carried over.
The developer, Real Vision Ltd, 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
- Real Vision Ltd
- Size
- 21.4 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 15 more
- English, Arabic, Dutch, French, German, Indonesian, Italian, Japanese, Korean, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Traditional Chinese, Turkish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- dB Meter Full App Access $3.99
- Decibels Pro — Lifetime $34.99
- Decibels Pro — Annual $19.99
- Copyright
- © 2025
