Decibels

Sound level meter with history

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

Free, with no account, no subscription, no ads and no tracking. Every measurement is saved on your iPhone, and nothing leaves it unless you export it. Decibels is a sound level meter that remembers what you measured. Point it at the noise, press start, press stop — and the reading stays. Average (Leq), maximum, minimum, duration and the full level trace, saved automatically, every time. No account, no subscription, and nothing leaves your phone unless you send it. MEASURE • A-weighted (dBA) or unweighted, per IEC 61672 • Fast (125 ms) and Slow (1 s) time weighting • LCpeak for impulses — alarms, slams, machinery • Live level trace with a ten-second window • Calibration offset for matching a reference meter KEEP • Every measurement saved automatically • History with the full trace of each run • CSV export carrying the settings it was taken under Decibels stores your measurements on your device and nowhere else. It records no audio — only the level — and asks for no location, no account and no identifiers. A note on accuracy: a phone microphone is not a calibrated instrument. Decibels is honest about that. Use the calibration offset against a reference meter for absolute readings, and treat it as an excellent relative instrument otherwise.

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Measurements now keep themselves. Stop the meter and the reading is saved — average, maximum, minimum, duration and the full level trace. There's no Save button to forget: it's already in History, behind the clock in the corner. Export any measurement as a CSV to send to a landlord, a contractor or a colleague, with the calibration and weighting it was taken under included, so the numbers mean something to whoever receives them. Four numbers, not one. The level right now, large, with the running average (Leq), maximum and minimum beneath it, and how long you've been measuring. LCpeak, for alarms and impulses. An average describes a room. It doesn't describe a fire alarm or a slammed door. LCpeak is the true peak, measured the way sound level meters measure impulses — and if the input clips, Decibels says so instead of quietly reporting a number that's really a floor. A clearer graph. Ten seconds of history on a fixed timeline, drawn as a smooth curve that never invents a peak the microphone didn't hear. It no longer flattens out above 100 dB. Fixed: the needle sat off its pivot on larger iPhones, and starting the meter without microphone access could close the app — it now explains what's wrong. If Decibels earns its keep, there's a way to buy me a coffee in Settings.

The developer, Merano Studio Limited, 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.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Seller
    Merano Studio Limited
    Size
    6.5 MB
    Category
    Utilities
    Compatibility
    Requires iOS 18.0 or later.
    • iPhone
      Requires iOS 18.0 or later.
    • iPad
      Requires iPadOS 18.0 or later.
    • Mac
      Requires macOS 15.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 2.0 or later.
    Languages
    English and 10 more
    • English, French, German, Greek, Hindi, Italian, Japanese, Romanian, Spanish, Swedish, Ukrainian
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    © Merano Studio Limited