# Sound Level Meter: Decibel — Decibel meter: graph, report > Decibel meter: graph, report (iPhone/iPad app by Raphael Goupille.) - Source: https://appshunter.io/ios/app/sound-level-meter-decibel/id6745488403 (this page in markdown: same URL + `.md`) - Developer: [Raphael Goupille](https://appshunter.io/developer/1650597250) - Category: Utilities, Health & Fitness - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 16 · 35 MB - Languages: English, French, German, Italian, Japanese, Chinese, Spanish - Released: 2025-06-03 - Data updated: 2026-06-05 - User reviews in markdown: https://appshunter.io/ios/app/sound-level-meter-decibel/id6745488403/reviews.md ## What is Sound Level Meter? Measure noise like a pro — straight from your iPhone. Sound Level Meter: Decibel turns your iPhone into a precision SPL meter, engineered to the IEC 61672-1 international standard. Protect your hearing, document a noise complaint, tune a studio, or pre-check a workplace - reliable readings in seconds, clean A4 PDF reports in one tap. KEY FEATURES • Real-time dB readings with A, C and Z weighting — switch on the fly • Fast (125 ms), Slow (1 s) and Impulse time integration — the modes pros use • 1/3-octave frequency analysis • Multiple live visualizations: histogram, gauge, circle meter, applause meter, basic graph • All metrics in one place: LAeq, Min, Max, Avg, Peak • Save full measurement sessions with timeline, location and notes • Calibration screen for fine-tuning against any reference meter • Available in English, French, German, Spanish, Italian, Japanese, Chinese • Distraction-free dark interface focused entirely on your data DESIGNED FOR ACCURACY Sound Level Meter: Decibel follows the IEC 61672-1 sound level meter specification: • True biquad-cascade A and C weighting filters — not generic high/low-pass approximations • Exponential averaging on squared pressure (the correct method) • Per-device calibration based on the iPhone hardware actually in use • User-adjustable offset to align with any reference meter or calibrator IDEAL FOR • Audio engineers tuning studios, venues and rehearsal spaces • Workplace safety pre-checks before a formal acoustic survey • Musicians, DJs and podcasters watching their hearing exposure • Parents monitoring nursery or kids' bedroom noise levels • Tenants documenting noise from neighbors, traffic or construction • Anyone serious about long-term hearing health FAQ How accurate is it? After one-time calibration against a known reference, expect 2–3 dB of typical accuracy in the 40–95 dB range. Maximum measurable level is bounded by your iPhone hardware (around 104–110 dB). Does it replace a certified sound level meter? For monitoring, awareness and personal documentation: yes. For legally certified acoustic measurements, dedicated class 1/2 hardware remains the reference. Can I export my measurements? Every saved session generates an A4 PDF with full stats and the timeline graph. Print it, email it, AirDrop it — anywhere PDFs work. Why do I see different values than another decibel app? iPhone microphone sensitivity varies between models, and each app handles calibration differently. Use the built-in calibration screen to align with a trusted reference. How is my data handled? Sessions are stored locally on your iPhone. Nothing is uploaded — your acoustic data stays yours. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy: https://sonometredecibelmeter.blogspot.com ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Annual subscription | $24.99 | per year | | Weekly Subscription | $1.99 | per 7 days | | Monthly subscription | $5.99 | per month | ## Version history (last 2 releases) ### 1.1 — 2026-05-26 Use the widget to view the latest measurements. ### 1.0 — 2025-06-03 No release notes. ## Apps similar to Sound Level Meter | App | Rating | Price | Category | | --- | --- | --- | --- | | [Decibel Meter - Sound Level dB](https://appshunter.io/ios/app/decibel-meter-sound-level-db/id1624503658) | 4.7 (1,242) | Free | Utilities | | [Light Meter LM-3000](https://appshunter.io/ios/app/light-meter-lm-3000/id1554264761) | 4.5 (2,424) | Free | Utilities | | [Sound Meter - Simple Detector](https://appshunter.io/ios/app/sound-meter-simple-detector/id1452030239) | 3.9 (35) | Free | Utilities | | [Decibel : dB sound level meter](https://appshunter.io/ios/app/decibel-db-sound-level-meter/id1227650795) | 4.6 (36,014) | Free | Utilities | | [Decibel Metre (Sound Meter)](https://appshunter.io/ios/app/decibel-metre-sound-meter/id1590659820) | 4.5 (577) | Free | Utilities | | [Sound Meter HQ](https://appshunter.io/ios/app/sound-meter-hq/id1093419762) | 4.8 (327) | Free | Utilities | ## More apps by Raphael Goupille - [Daily Facts: General Knowledge](https://appshunter.io/ios/app/daily-facts-general-knowledge/id1669986922) - [Fabula](https://appshunter.io/ios/app/fabula/id6443920494) - [TimeSort - history game](https://appshunter.io/ios/app/timesort-history-game/id6479203877) - [Tic Tac Toe: XO No Draw Duel](https://appshunter.io/ios/app/tic-tac-toe-xo-no-draw-duel/id6593659647) - [Toilets Paris: WC Restroom Map](https://appshunter.io/ios/app/toilets-paris-wc-restroom-map/id6738012871) - [Hangman: Word Puzzle Game](https://appshunter.io/ios/app/hangman-word-puzzle-game/id6741486763) All apps by Raphael Goupille: https://appshunter.io/developer/1650597250 ## Related topics [raphael goupille](https://appshunter.io/ios/topics/raphael-goupille) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*