{"appstoreID":6745488403,"title":"Sound Level Meter: Decibel","subtitle":"Noise Analyzer · SPL & dBA Leq","developerName":"Raphael Goupille","description":"Measure noise like a pro — straight from your iPhone.\n\nSound 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.                                  \n\nKEY FEATURES\n\n  • Real-time dB readings with A, C and Z weighting — switch on the fly\n  • Fast (125 ms), Slow (1 s) and Impulse time integration — the modes pros use\n  • 1/3-octave frequency analysis                                                                          \n  • Multiple live visualizations: histogram, gauge, circle meter, applause meter, basic graph\n  • All metrics in one place: LAeq, Min, Max, Avg, Peak                                                    \n  • Save full measurement sessions with timeline, location and notes\n  • Calibration screen for fine-tuning against any reference meter                                         \n  • Available in English, French, German, Spanish, Italian, Japanese, Chinese\n  • Distraction-free dark interface focused entirely on your data                                          \n                                                                 \nDESIGNED FOR ACCURACY\nSound Level Meter: Decibel follows the IEC 61672-1 sound level meter specification:\n  • True biquad-cascade A and C weighting filters — not generic high/low-pass approximations               \n  • Exponential averaging on squared pressure (the correct method)                          \n  • Per-device calibration based on the iPhone hardware actually in use                                    \n  • User-adjustable offset to align with any reference meter or calibrator                                 \n\nIDEAL FOR                                                                                                \n  • Audio engineers tuning studios, venues and rehearsal spaces\n  • Workplace safety pre-checks before a formal acoustic survey                                            \n  • Musicians, DJs and podcasters watching their hearing exposure\n  • Parents monitoring nursery or kids' bedroom noise levels                                               \n  • Tenants documenting noise from neighbors, traffic or construction\n  • Anyone serious about long-term hearing health                                                          \n\nFAQ                                                 \nHow accurate is it?\nAfter 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).\n\nDoes it replace a certified sound level meter?\nFor monitoring, awareness and personal documentation: yes. For legally certified acoustic measurements, dedicated class 1/2 hardware remains the reference.\n\nCan I export my measurements?\nEvery saved session generates an A4 PDF with full stats and the timeline graph. Print it, email it, AirDrop it — anywhere PDFs work. \n\nWhy do I see different values than another decibel app?\niPhone microphone sensitivity varies between models, and each app handles calibration differently. Use the built-in calibration screen to align with a trusted reference.\n                                                                                                       \nHow is my data handled?\nSessions are stored locally on your iPhone. Nothing is uploaded — your acoustic data stays yours.\n\nTerms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/\nPrivacy: https://sonometredecibelmeter.blogspot.com","bundleID":"squirel.SonoMeter","appiconURL":"https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/2d/ed/58/2ded5886-90b5-5401-e05a-5e0052dc79d3/Placeholder.mill/1024x1024w.webp","formattedPrice":"Free","appUpdated":"2026-05-26T19:28:20.000Z","appReleased":"2025-06-03T07:00:00.000Z","version":"1.1","platforms":["iphone","ipad"],"minOS":{"iphone":"Requires iOS 16 or later.","ipad":"Requires iPadOS 16 or later.","mac":"Requires macOS 13.0 or later and a Mac with Apple M1 chip or later.","vision":"Requires visionOS 1.0 or later."},"languages":["EN","FR","DE","IT","JA","ZH","ES"],"size":"35 MB","category":"Utilities","developerWebsite":"https://sonometredecibelmeter.blogspot.com","screenshots":[{"platform":"ipad","url":"https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/b1/06/e4/b106e43c-277d-763b-f3ab-27a857cacd6f/Sound_level_meter.jpg/2048x2732w.webp"},{"platform":"ipad","url":"https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/b9/81/4d/b9814de7-9741-6604-7c49-3807832e8f87/Sound_level_meter_graphs.jpg/2048x2732w.webp"},{"platform":"ipad","url":"https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/75/e2/d9/75e2d975-f4d0-bca6-ecde-b952c84a70b9/Sound_level_meter_backup.jpg/2048x2732w.webp"},{"platform":"ipad","url":"https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/e8/52/b9/e852b971-6402-323b-8966-860d91d530d3/Sound_level_meter_Applausemeter.jpg/2048x2732w.webp"},{"platform":"ipad","url":"https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/f0/a1/92/f0a19258-3b8d-1451-0c03-1d67fbbc6423/Sound_level_meter_calibration.jpg/2048x2732w.webp"},{"platform":"iphone","url":"https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/d1/ee/b5/d1eeb5bb-e724-a2c2-15e0-f52c332bea60/Sonometre1.jpg/1284x2778w.webp"},{"platform":"iphone","url":"https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/3f/c5/d2/3fc5d2c5-672a-2904-fadf-a0c8f98c69c6/sonome_U0300tre_rapport.jpg/1284x2778w.webp"},{"platform":"iphone","url":"https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/67/1c/df/671cdf5c-c103-eb6f-1527-b1cf0bc3acab/sound_level_meter3.jpg/1284x2778w.webp"},{"platform":"iphone","url":"https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/99/5f/3d/995f3dae-4e08-52d1-87f9-5ccb7771943e/sound_level_meter2.jpg/1284x2778w.webp"},{"platform":"iphone","url":"https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/85/b2/a9/85b2a970-5959-6e6a-eb6b-2278d42beb17/sound_level_meter4.jpg/1284x2778w.webp"}]}