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Decibel Meter

Help & frequently asked questions

Decibel Meter shows an approximate sound level from your phone’s microphone: the level in dB on a large dial, minimum, average and maximum, the last minute as a chart and a scale of everyday sounds. It works with no connection and no account. It is not a calibrated sound level meter and cannot replace one for legal, workplace or medical measurements.

How to measure

  1. Tap Start. The first time, iOS asks for the microphone; the app asks only then.
  2. Hold the phone still with the microphone (bottom edge) free, pointing at the sound. A case or a hand over the microphone lowers the reading.
  3. Read the dial. MIN, AVG and MAX build up while you measure; the chart shows the last minute.
  4. Tap Stop to end. The reset arrow starts the numbers over.

The line under the dial says what the level sounds like. Tap it for the full noise scale, with your current level placed on it.

Questions

How accurate is it?

The microphone reports digital levels (dBFS). The app adds a fixed offset of 123 dB to turn them into an approximate sound pressure level, and uses iOS’s measurement mode so no automatic gain changes the signal. Phone models, cases and how you hold the phone change the reading by several decibels. With Pro you can set a calibration offset: put the phone next to a calibrated meter or a 94 dB calibrator and adjust until both agree.

Readings around 30–35 dB are close to the phone microphone’s own noise floor and are not reliable: a very quiet room reads higher than it is.

dB or dBA?

dB is the flat, unweighted level: every frequency counts the same. dBA (Pro) applies the A-weighting of IEC 61672, which follows the ear’s lower sensitivity to bass and very high notes. Noise rules and hearing guidance are written in dBA. Changing the weighting keeps the running measurement in the history and starts a new one.

What are MIN, AVG, MAX and Leq?

The dial uses the standard Fast time weighting (125 ms), like a hand-held meter; MIN, AVG and MAX are taken from it. Leq (Pro) is the energy average: the steady level that carries the same sound energy as the whole measurement. Loud moments count for more, so Leq is always at or above the plain average. Noise limits are often given as a Leq over a set time, such as one minute or one hour.

Korean floor-noise limits

On a phone set to Korean or the Korean region, the noise scale also lists Korea’s apartment floor-noise limits for direct impact noise: 1-minute Leq 39 dB(A) by day and 34 dB(A) at night, maximum 57 dB(A) by day and 52 dB(A) at night (day 06:00–22:00, night 22:00–06:00). A maximum limit counts as exceeded only when it is passed 3 or more times in an hour. A phone reading is a reference only, not an official measurement.

What is free, and what is Decibel Meter Pro?

Free: the live level in dB, minimum, average and maximum, the last-minute chart and the noise scale. Decibel Meter Pro (one payment, no subscription) adds dBA, Leq, the history of your measurements with PDF and CSV export, an in-app level alert and the calibration offset. Pro options are on the More screen (… at the top right) and show a PRO badge while locked.

Does the alert work in the background?

No. The level alert turns the dial red and vibrates while the app is open. The app stops measuring when it goes to the background and sends no notifications.

I paid but it is still locked

Open Settings (the gear at the top left) and tap Restore Purchase, signed in with the Apple Account you bought with.

Can I get a refund?

Refunds are handled by Apple: reportaproblem.apple.com.

What data is collected?

None. The microphone is used only while you measure; audio is analysed live and never recorded, stored or sent. Measurements are kept only on your device and are removed with the app or with Delete all measurements in Settings. See the Privacy Policy.

Still stuck?

Email hayriodabas@gmail.com with your device model and what you were doing.

데시벨 측정기

도움말 및 자주 묻는 질문

데시벨 측정기는 휴대폰 마이크로 소리의 크기를 대략적으로 보여 줍니다. 교정된 소음계가 아니므로 법적 분쟁, 작업장, 의료 등 공식적인 측정을 대신할 수 없습니다.

측정 방법

  1. 측정 시작을 누르세요. 처음 한 번만 iOS가 마이크 권한을 묻습니다.
  2. 마이크(휴대폰 아래쪽)를 가리지 말고 소리 나는 쪽으로 향한 채 가만히 드세요. 케이스나 손이 마이크를 막으면 값이 낮아집니다.
  3. 게이지를 읽으세요. 측정하는 동안 최소·평균·최대가 쌓이고, 그래프는 최근 1분을 보여 줍니다.
  4. 정지를 누르면 측정이 끝납니다. 초기화 버튼은 값을 처음부터 다시 셉니다.

층간소음 기준과 비교하려면

휴대폰이 한국어나 한국 지역으로 설정되어 있으면 소음 기준표에 층간소음(직접충격소음) 기준이 함께 나옵니다: 1분 등가소음도 주간 39 dB(A)·야간 34 dB(A), 최고소음도 주간 57 dB(A)·야간 52 dB(A) (주간 06~22시, 야간 22~06시). 최고소음도 기준은 1시간에 3회 이상 넘을 때 초과로 봅니다. 기준이 A 가중 값이므로 Pro의 dBA와 1분 Leq로 비교하세요. 휴대폰 측정값은 참고용이며 공식 측정이나 분쟁 조정의 근거가 될 수 없습니다. 특히 30~35 dB 안팎의 값은 휴대폰 마이크 자체의 잡음 수준에 가까워 믿기 어렵습니다(야간 기준 34 dB 부근).

dB와 dBA, Leq는 무엇인가요?

dB는 가중하지 않은 평탄한 값이고, dBA(Pro)는 사람의 귀에 가까운 IEC 61672 A 가중입니다. Leq(등가소음도, Pro)는 측정 전체와 같은 소리 에너지를 가진 일정한 레벨로, 큰 소리가 더 크게 반영됩니다.

무료 기능과 Pro

무료: 실시간 dB, 최소·평균·최대, 최근 1분 그래프, 소음 기준표. Pro(한 번 결제, 구독 없음): dBA, Leq, 측정 기록과 PDF·CSV 내보내기, 앱 안 소음 경고, 보정값. Pro 항목은 오른쪽 위 더 보기(…) 화면에 있으며 잠겨 있는 동안 PRO 배지가 붙습니다.

결제했는데 잠겨 있어요

왼쪽 위 톱니바퀴(설정)에서 구입 복원을 누르세요. 구입한 Apple 계정으로 로그인되어 있어야 합니다.

개인정보

수집하는 정보가 없습니다. 마이크는 측정하는 동안에만 쓰이며 소리는 녹음·저장·전송되지 않습니다. 개인정보 처리방침. 문의: hayriodabas@gmail.com (한국어 또는 영어).

Decibel Meter

Hulp en veelgestelde vragen

Decibel Meter toont een benadering van het geluidsniveau via de microfoon van je telefoon. Het is geen gekalibreerde geluidsmeter en vervangt die niet bij juridische, arbeids- of medische metingen.

Meten

  1. Tik op Start. De eerste keer vraagt iOS om de microfoon; de app vraagt het alleen dan.
  2. Houd de telefoon stil met de microfoon (onderkant) vrij, gericht op het geluid.
  3. Lees de wijzer af. MIN, GEM en MAX lopen mee; de grafiek toont de laatste minuut.
  4. Tik op Stop om te stoppen. Wissen (de pijl) zet de waarden terug.

dB, dBA en Leq

dB is het ongewogen niveau. dBA (Pro) gebruikt de A-weging van IEC 61672, zoals geluidsregels. Leq (Pro) is het energetisch gemiddelde: harde momenten tellen zwaarder. Geluidsgrenzen worden vaak gegeven als Leq over een vaste tijd, zoals een minuut of een uur.

Waarden rond 30–35 dB liggen dicht bij de eigen ruis van de telefoonmicrofoon en zijn onbetrouwbaar.

Gratis en Pro

Gratis: live niveau in dB, minimum, gemiddelde en maximum, de grafiek van de laatste minuut en de geluidsschaal. Pro (eenmalige betaling, geen abonnement) voegt dBA, Leq, de geschiedenis met pdf- en csv-export, een niveaualarm in de app en een kalibratiecorrectie toe. Je vindt ze onder Meer (… rechtsboven), met een PRO-label zolang ze op slot zijn.

Betaald maar nog op slot?

Open Instellingen (tandwiel linksboven) en tik op Herstel aankoop, ingelogd met het Apple-account waarmee je hebt betaald.

Privacy

Er wordt niets verzameld. De microfoon wordt alleen tijdens het meten gebruikt en er wordt nooit iets opgenomen of verstuurd. Zie het privacybeleid. Vragen: hayriodabas@gmail.com (Nederlands of Engels).