MeterWorks Sound Meter: a noise log with a PDF you can hand over.
view on the app store ↗ ios · iphone & ipad
The automatic noise log: measure noise, document incidents, export a log PDF for your landlord, mediator or solicitor. One-time purchase — no ads, no subscription.
A diary, not just a meter
The core of the app is the noise diary: every incident is logged with its time, duration, type and measured level. A recording becomes a diary entry with a tap, and categories such as bass/music, footsteps, a dog, drilling or traffic keep the log readable. Nothing about this is a secret recording — level values only, never audio. The exported log PDF lists date, time, duration, type, level and a note in a table, ready to hand over when you need to back up a noise complaint to a landlord, a tenants' association or a solicitor.
Live measurement
A large reading of loudness in decibels (dB(A)), a Fast/Slow rating and a real-time graph show what's happening right now, alongside Leq, LAFmax and LAFmin. An offset calibration (±25 dB) against a reference device improves accuracy, and Pro adds dB(C)/dB(Z) weighting plus the L10/L50/L90/L95 percentiles used in more formal noise assessments.
Honest about its limits
iPhone microphones reliably measure roughly 30–100 dB(A), accurate to about ±2–3 dB once calibrated. That's genuinely useful for documenting neighbourhood noise, dialling in a home cinema or rehearsal room, or comparing machine and fan noise before and after a fix — but it is explicitly not a calibrated sound level meter (SPL) and not admissible in court.
- PNG overview export, free; CSV export of second-by-second values (Pro)
- Multi-page PDF report with statistics, level graph and event table (Pro)
- Auto-events on threshold exceedance, with start, duration, Leq and max level (Pro)
- Free tier: unlimited live measurement, three recordings up to 10 seconds each, three manual diary entries a day
MeterWorks Sound Meter is not a calibrated measuring instrument and must not be used for safety-critical, occupational-safety, or court-evidentiary purposes. It documents; it does not certify. Digitalbucht is the sole proprietorship of Emil Deak, based in Wülfrath, Germany.
Data and privacy
The app uses the microphone. Level values are processed and stored only on your device — no audio recordings are ever created or transmitted. On start, it anonymously checks with Apple whether the sibling MeterWorks apps are available in your storefront; no personal data is sent. Exporting or sharing a log only happens on your own action. No adverts, no tracking.
Full terms of use and privacy policy for all apps: Apps: terms & privacy.
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Last updated: August 2026
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