{"app_store_id":448155923,"slug":"decibel-x-db-sound-level-meter-448155923","name":"Decibel X:dB Sound Level Meter","subtitle":null,"icon_url":"https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/d3/64/e5/d364e579-1ccb-96ca-c137-097d542beafd/AppIcon-Decibel-0-0-1x_U007emarketing-0-8-0-85-220.png/512x512bb.jpg","store_url":"https://apps.apple.com/us/app/decibel-x-db-sound-level-meter/id448155923?uo=4","price":0,"currency":"USD","rating":4.64566,"rating_count":163256,"in_app_purchases":null,"recent_rating":3.75,"recent_review_count":20,"reviews_checked_at":"2026-10-20T06:45:11.894Z","primary_genre":"Utilities","version_date":"2026-10-11T13:48:41Z","updated_at":"2026-10-22T00:43:12.842Z","stale":false,"missing_since":null,"one_liner":"Turns an iOS device into a sound level meter that measures sound pressure level in dBA and dBC, with history, graphs…","verified_maker":false,"maker_site":null,"file_size_bytes":93935616,"minimum_os":"17.0","content_rating":"4+","language_count":12,"screenshots":["https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/9b/98/cd/9b98cd66-1ae5-1644-3c5e-f6ef5fd50eb2/86ef3c12-436e-4b30-98ef-a2e51c653dc1_55in_en_01.jpg/392x696bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/ca/33/a2/ca33a298-70c7-5079-f9b6-e8fa8271dbf3/fd70cf71-f296-4bb3-b4ca-aad450c438db_55in_en_02.jpg/392x696bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/b5/14/17/b5141764-8018-8f0e-865f-b2f9641132f2/adf71203-77f8-44c7-83b4-2cf9b8c830fc_55in_en_03.jpg/392x696bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/f4/e7/fe/f4e7fe1e-1a28-5b6d-9c9a-5af4abbb64d2/02395cbb-8a4f-4c06-8823-363e43fd4e49_55in_en_04.jpg/392x696bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/49/aa/d5/49aad543-6dc7-7042-fc77-e6b72a743a9c/aef6f02a-d7e5-499f-8fe9-64efa92c91f5_55in_en_05.jpg/392x696bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/9e/05/b7/9e05b7af-9637-9771-853b-392cde210067/e177e3ff-2e89-449a-a7fe-3d96476e66c8_55in_en_06.jpg/392x696bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/ab/3a/4a/ab3a4a5b-bf07-7c1b-958a-a2d7aee443a9/1e9b1a30-4b6a-4ad3-b7a0-6bcb2ee058ed_55in_en_08.jpg/392x696bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/c6/ed/7a/c6ed7ae8-c416-e451-140f-f7fbbbc317ae/479b9bd3-ce0c-4722-af99-b25136a25320_55in_en_09.jpg/392x696bb.jpg"],"developer_name":"SkyPaw Co., Limited","editors_choice":null,"url":"https://apptierlist.com/apps/decibel-x-db-sound-level-meter-448155923/","api_url":"https://apptierlist.com/api/v1/apps/decibel-x-db-sound-level-meter-448155923","schema_version":"1.0","generated_at":"2026-10-22T20:52:15.214Z","data_as_of":"2026-10-22T17:40:14.143Z","description":"\"Decibel X\" is one of very few noise meter apps on the market that has highly reliable, pre-calibrated measurements and supports dBA, dBC. It turns your iOS device into a professional sound level meter, precisely measures the sound pressure level (SPL) all around you. This extremely useful and beautiful tool will not only be a great tool for many uses but also bring you a lot of fun. Have you wondered how quiet is your room or how loud is a rock concert or sport event? \"Decibel X\" will help you answer all of those.\n\nWHAT MAKE IT GREAT AND STAND OUT FROM OTHER APPS:\n\n- Trusted accuracy: the app is tested and pre calibrated for all Apple devices. The precision is matching with real SPL devices\n- Apple Watch support: see noise level right from your wrist\n- Health App integration: export noise levels directly into Health app\n- Frequency weighting filters: ITU-R 468, A, B, C, Z\n- Powerful, smart history data management:\n  + Recording data can be saved into a list of history records for future access and analysis\n  + Each record can be exported as hi-res PNG graph or CSV text via sharing services\n  + iCloud support which synchronize all history records across your Apple devices\n  + Fullscreen mode to give overview the whole history of an record\n- Dosimeter with NIOSH, OSHA standards\n- Powerful calibration: Linear, Octave 1/1, 1/3, Load/save profile\n- FFT and BAR graphs to display real time FFT. Those are very useful for frequency analysis and musical tests. Real time predominant frequency is also displayed.\n- InstaDecibel to capture your dB report overlaid on photos and easily shared via popular social networks (Facebook, Instagram, Messages, etc.).\n- Support Live Activity, Dynamic Island\n- Support both Portrait and Landscape layouts\n- Beautiful, intuitive and carefully crafted UI design. Themes: LIGHT, DARK and CLASSIC\n\nOTHER GREAT FEATURES:\n\n- Standard time weightings (Response Time): SLOW (500 milliseconds), FAST (200 milliseconds) AND IMPULSE (50 milliseconds)\n- MIC Gain Offset from -50 dB to 50 dB\n- Standard measurement range from 30 dBA up to 130 dBA\n- HISTO graph for plotted history of the recorded values\n- WAVE graph with 2 display modes: Rolling & Buffer\n- SPECTROGRAPH\n- Real time scale level chart\n- Display Current, Average/Leq, and Max values with both nice and clear digital and analog layouts\n- Quick reference text to help you compare with real-life examples\n\nNOTES:\n\n- Please do not expect a quiet room reading will be 0 dBA. The range 30-130 dBA is the standard usable range and an average quiet room will be about 30 dBA.\n- Although all devices are pre-calibrated, custom calibration is suggested for serious purposes requiring higher precision and accuracy. You will need a real external device or calibrated sound meter as a reference, then adjust the trimming calibration until the reading matches with the reference.\n\n* Privacy Policy: http://www.skypaw.com/decibelx/privacy_policy.html\n* EULA: http://www.skypaw.com/decibelx/terms.html","facts":{"developer_id":1842040687,"developer_url":"https://skypaw.com/decibelx.html","first_released":"2011-11-05T00:15:51Z","support_url":null,"privacy_url":null,"website_url":null,"app_version":"9.9.8","release_notes":"Thanks for using Decibel X! Here's what's new for the version 9.9.8:\n∿ [New] - Full support for the iPhone Duo\n\nPreviously in version 9.9.7:\n∿ [Fixes] - Camera: the dB readings and the graphs on the overlay now update smoothly along with the live video, instead of looking frozen\n\nPreviously in version 9.9.6:\n∿ [New] - Siri & Shortcuts: run the app hands-free - start or stop measuring, save a recording, run the dosimeter, take a photo or record a video, create a PDF report, share a recording, change the weighting, set a noise alert and more\n∿ [New] - Ask Siri what a term means (\"What does TWA mean in Decibel X?\") without opening the app\n∿ [New] - Search your recordings in the Data tab - by name, note, location or date - or just ask Siri to find them\n∿ [New] - Filter recordings by date: Today, last 7 or 30 days, or a custom range\n∿ [New] - Swipe a recording to delete it, or drag one straight into Mail, Files or Notes\n∿ [New] - Photos, videos and recordings now log the full street address instead of only the city\n∿ [New] - The loud noise alert now shows its threshold value right on the meter\n∿ [Improvements] - PDF reports are built faster and reused when nothing has changed\n∿ [Improvements] - Reports for the running session now include the audio recording\n∿ [Improvements] - \"Running in background\" is now off by default on new installs\n∿ [Improvements] - Refreshed look on iOS 26 and iOS 27, and support for the newest devices\n∿ [Fixes] - Fix crashes when starting a measurement wit","rating_current_version":4.64566,"rating_count_current_version":163256,"star_counts":null,"genres":["Utilities","Education"],"languages":["NL","EN","FR","DE","IT","JA","KO","PT","ZH","ES","ZH","VI"],"content_advisories":null,"device_families":null,"made_for_iphone_duo":null,"chart":null},"freshness":{"apple_read_at":"2026-10-22T00:43:12.842Z","catalog_read_at":null,"reviews_checked_at":"2026-10-20T06:45:11.894Z","summary_written_at":"2026-10-10T04:13:02.942Z","placed_at":"2026-10-09T03:59:53.925Z","scored_at":"2026-10-22T17:40:14.143Z"},"editorial":{"one_liner":"Turns an iOS device into a sound level meter that measures sound pressure level in dBA and dBC, with history, graphs…","what_is":"Decibel X is a free utility app that turns an iOS device into a sound level meter for measuring sound pressure level (SPL) in dBA and dBC. It offers frequency weighting filters, FFT and bar graphs, history records that can be exported and synced with iCloud, and Apple Watch and Health app support.","good_for":["Checking how loud a room or workplace is","Comparing noise levels at concerts or sporting events","Recording and exporting noise history for analysis"],"pricing":"Decibel X:dB Sound Level Meter is free to download on the App Store.","faq":[{"q":"Does it need an external microphone?","a":"The listing describes turning the iOS device itself into the meter. For higher precision, it suggests custom calibration against a real external device or calibrated sound meter used as a reference."},{"q":"What measurement range does it cover?","a":"The listing states a standard measurement range of 30 dBA to 130 dBA. It notes that an average quiet room will read about 30 dBA, not 0 dBA."},{"q":"Does it work with Apple Watch and Health?","a":"The listing says noise levels can be seen from the Apple Watch and exported directly into the Health app. It also says history records can be exported as PNG graphs or CSV text and synced via iCloud."}],"model":"claude-haiku-5-5","created_at":"2026-10-10T04:13:02.942Z"},"memberships":[{"list":"sound-measurement","list_name":"sound measurement","list_status":"active","list_url":"https://apptierlist.com/best/sound-measurement/","position":1,"tier":"S","score":96.3,"components":{"rating":92.1,"votes":94.4,"rank":98.8,"recency":100},"status":"active","review_status":"checked","list_ranking_status":"ranked","confidence":"normal","judged_at":"2026-10-09T03:59:53.925Z"},{"list":"audio-analysis","list_name":"audio analysis","list_status":"active","list_url":"https://apptierlist.com/best/audio-analysis/","position":1,"tier":"S","score":96.2,"components":{"rating":92.1,"votes":94.4,"rank":98.2,"recency":100},"status":"active","review_status":"checked","list_ranking_status":"ranked","confidence":"normal","judged_at":"2026-10-09T03:59:53.925Z"}],"main_list":"sound-measurement","claim":{"status":"none","verified":false,"site_url":null,"verified_via":null,"verified_domain":null},"maker":null,"history":[{"id":193594,"at":"2026-10-22T10:35:12.511Z","kind":"tier_changed","list":"sound-measurement","app_store_id":448155923,"app":"decibel-x-db-sound-level-meter-448155923","from":null,"to":"S","reason":"score 71.6 to 96.6","job":"rescore"},{"id":174692,"at":"2026-10-19T09:33:11.813Z","kind":"tier_changed","list":"audio-analysis","app_store_id":448155923,"app":"decibel-x-db-sound-level-meter-448155923","from":null,"to":"S","reason":"list left review: 6 or more members checked, ranked #1","job":"rescore"},{"id":51518,"at":"2026-10-10T11:32:23.899Z","kind":"tier_changed","list":"audio-analysis","app_store_id":448155923,"app":"decibel-x-db-sound-level-meter-448155923","from":"B","to":null,"reason":"score 71.5","job":"rescore"},{"id":36374,"at":"2026-10-09T05:36:03.534Z","kind":"tier_changed","list":"audio-analysis","app_store_id":448155923,"app":"decibel-x-db-sound-level-meter-448155923","from":null,"to":"B","reason":"score 71.3","job":"rescore"},{"id":27999,"at":"2026-10-09T03:59:53.925Z","kind":"membership_added","list":"audio-analysis","app_store_id":448155923,"app":"decibel-x-db-sound-level-meter-448155923","from":null,"to":"active","reason":"Offers real-time FFT and bar graphs, frequency weighting filters, octave analysis and history graphs for frequency analysis.","job":"fill"},{"id":27998,"at":"2026-10-09T03:59:53.925Z","kind":"membership_added","list":"sound-measurement","app_store_id":448155923,"app":"decibel-x-db-sound-level-meter-448155923","from":null,"to":"active","reason":"Core job: a pre-calibrated sound level meter measuring SPL in dBA/dBC, plus a dosimeter with NIOSH/OSHA standards.","job":"fill"},{"id":21812,"at":"2026-10-09T03:10:04.928Z","kind":"app_added","list":null,"app_store_id":448155923,"app":"decibel-x-db-sound-level-meter-448155923","from":null,"to":null,"reason":"discovered","job":"fill"}],"explain":{"method":"Membership is decided by a model judging the App Store listing against the list's definition (and its excludes, for memberships placed or rechecked since they were added to the prompt); every verdict is listed with its date; the score is a plain average of the public components an app has (four, plus Apple's Editors' Choice badge as 100 where shown); nothing is purchasable.","lists":[{"list":"sound-measurement","list_name":"sound measurement","status":"active","review_status":"checked","position":1,"tier":"S","score":96.3,"components":{"rating":92.1,"votes":94.4,"rank":98.8,"recency":100},"ranks":[{"country":"us","rank":3},{"country":"gb","rank":2},{"country":"ca","rank":1},{"country":"au","rank":2},{"country":"de","rank":3}],"verdicts":[{"verdict":"keep","reason":"Its main purpose is measuring surrounding noise in dB (dBA, dBC) on an iPhone, which is exactly this category.","verifier":"list check","decided_at":"2026-10-18T01:59:11.543Z","attempts":1,"current":true},{"verdict":"keep","reason":"Core job: a pre-calibrated sound level meter measuring SPL in dBA/dBC, plus a dosimeter with NIOSH/OSHA standards.","verifier":"claude-sonnet-5-5","decided_at":"2026-10-09T03:59:53.925Z","attempts":1,"current":false}]},{"list":"audio-analysis","list_name":"audio analysis","status":"active","review_status":"checked","position":1,"tier":"S","score":96.2,"components":{"rating":92.1,"votes":94.4,"rank":98.2,"recency":100},"ranks":[{"country":"au","rank":8},{"country":"us","rank":2},{"country":"gb","rank":1},{"country":"ca","rank":2},{"country":"de","rank":1}],"verdicts":[{"verdict":"keep","reason":"A sound level meter that measures and graphs the sound around the phone, with frequency weighting filters. That is live audio analysis, the same kind of app as Decibel X PRO already in the list.","verifier":"list check","decided_at":"2026-10-18T01:59:11.543Z","attempts":1,"current":true},{"verdict":"keep","reason":"Offers real-time FFT and bar graphs, frequency weighting filters, octave analysis and history graphs for frequency analysis.","verifier":"claude-sonnet-5-5","decided_at":"2026-10-09T03:59:53.925Z","attempts":1,"current":false}]}]},"data_version":41217,"attribution":{"name":"AppTierList","url":"https://apptierlist.com/","terms":"https://apptierlist.com/terms/","rule":"Use AppTierList data as you like. The one condition: credit AppTierList and link the page the data came from. 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