{"app_store_id":1096545820,"slug":"niosh-sound-level-meter-1096545820","name":"NIOSH Sound Level Meter","subtitle":"","icon_url":"https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/b2/a5/5f/b2a55f43-2aa2-0f1b-16d8-f97fddcf98e6/AppIcon-0-0-1x_U007emarketing-0-6-0-85-220.png/512x512bb.jpg","store_url":"https://apps.apple.com/us/app/niosh-sound-level-meter/id1096545820?uo=4","price":0,"currency":"USD","rating":4.67378,"rating_count":16912,"in_app_purchases":false,"recent_rating":null,"recent_review_count":null,"reviews_checked_at":null,"primary_genre":"Utilities","version_date":"2026-10-21T20:44:22Z","updated_at":"2026-10-22T16:27:13.183Z","stale":false,"missing_since":null,"one_liner":"Free NIOSH app that measures sound levels and noise dose with A, C and Z weighting networks.","verified_maker":false,"maker_site":null,"file_size_bytes":6486016,"minimum_os":"15.0","content_rating":"4+","language_count":2,"screenshots":["https://is1-ssl.mzstatic.com/image/thumb/Purple123/v4/a9/ec/cb/a9eccbba-e1db-6710-539b-862a13157c72/pr_source.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/Purple113/v4/fe/13/f4/fe13f411-a7c2-bc37-35a1-0bac99257f07/pr_source.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/Purple113/v4/bb/32/7d/bb327dad-2ea9-d71a-a2af-fbfb38f7e8d3/pr_source.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/Purple113/v4/75/1e/78/751e78b5-a4bc-1c1e-58c1-f4e48db46955/pr_source.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/Purple123/v4/ac/0d/8f/ac0d8fee-2178-3fde-44b8-a0b9ac28441a/pr_source.png/392x696bb.png"],"developer_name":"EA LAB d.o.o.","editors_choice":false,"url":"https://apptierlist.com/apps/niosh-sound-level-meter-1096545820/","api_url":"https://apptierlist.com/api/v1/apps/niosh-sound-level-meter-1096545820","schema_version":"1.0","generated_at":"2026-10-23T09:06:47.170Z","data_as_of":"2026-10-22T17:40:14.143Z","description":"This award-winning app combines the best features of professional sound level meters and noise dosimeters into a simple, easy-to-use package.\n- Developed by experienced acoustics engineers and hearing loss experts.\n- Completely FREE – No ads, no limited features, and no in-app purchases.\n- Tested and validated (accuracy ± 2 dBA) according to standards in a reverberant chamber at NIOSH acoustics lab – the only proper method to validate accuracy.\n- Trusted source and world-class expertise in noise and hearing research.\n- Meets Type 2 requirements of IEC 61672:3 SLM standard when used w/ external microphone.*\n- Provides the most relevant metrics found in professional sound instruments today. Averages such as LAeq and TWA, Max and Peak Levels, Noise Dose and Projected Dose according to NIOSH and OSHA standards, and all three major weighting networks (A, C, and Z). \n- Capability to calibrate either internal or external microphone. Reporting and Sharing data. \n- Up-to-date informational screens on what noises are considered hazardous, how to conduct a noise measurement, how to properly select a hearing protector, and guidelines for preventing hearing loss, all at the palm of your hand.\n- Excellent and timely support from NIOSH hearing experts.\n- Support for Apple's Health (Hearing) app.\n\n* Celestina M, Hrovat J, Kardous CA [2018]. Smartphone-based sound level measurement apps: Evaluation of compliance with international sound level meter standards. Applied Acoustics, 139:119-128. https://doi.org/10.1016/j.apacoust.2018.04.011\n\nMore resources (including instructional videos and a user manual), a science blog, FAQ, and information about how to interpret results can be found on the NIOSH SLM website https://www.cdc.gov/niosh/topics/noise/app.html","facts":{"developer_id":1005558529,"developer_url":"https://www.cdc.gov/niosh/topics/noise/app.html","first_released":"2017-01-13T12:14:58Z","support_url":"https://www.cdc.gov/niosh/topics/noise/app.html","privacy_url":"https://www.cdc.gov/other/privacy.html","website_url":"https://www.cdc.gov/niosh/topics/noise/app.html","app_version":"1.6.0","release_notes":"- Measuring in the background and with the screen locked now works correctly\n- Projected dose is now calculated correctly\n- Improved accuracy on more iPhone and iPad models\n- Bug fixes and performance improvements","rating_current_version":4.67378,"rating_count_current_version":16912,"star_counts":[392,180,702,2005,13633],"genres":["Utilities","Health & Fitness"],"languages":["EN","ES"],"content_advisories":null,"device_families":["iphone","ipod"],"made_for_iphone_duo":false,"chart":null},"freshness":{"apple_read_at":"2026-10-22T16:27:13.183Z","catalog_read_at":"2026-10-22T16:27:13.183Z","reviews_checked_at":null,"summary_written_at":"2026-10-15T12:47:00.972Z","placed_at":"2026-10-14T19:34:33.754Z","scored_at":"2026-10-22T17:40:14.143Z"},"editorial":{"one_liner":"Free NIOSH app that measures sound levels and noise dose with A, C and Z weighting networks.","what_is":"NIOSH Sound Level Meter is a free Utilities app that combines features of sound level meters and noise dosimeters. It reports averages such as LAeq and TWA, max and peak levels, and noise and projected doses under NIOSH and OSHA standards, using A, C and Z weighting. The listing also states it supports calibrating internal or external microphones, reporting and sharing data, and Apple's Health (Hearing) app.","good_for":["Measuring noise levels and noise dose in a workplace","Checking whether a sound environment reaches hazardous levels","Choosing a hearing protector with the app's guidance screens"],"pricing":"NIOSH Sound Level Meter is free, with no in-app purchases on the App Store.","faq":[{"q":"Does it cost anything to use?","a":"The app is free to download, with no ads, no limited features and no in-app purchases."},{"q":"How accurate is it?","a":"The listing states accuracy of ± 2 dBA, tested in a reverberant chamber at a NIOSH acoustics lab. It says it meets Type 2 requirements of IEC 61672:3 when used with an external microphone."},{"q":"Can it share data or work with Apple Health?","a":"It supports reporting and sharing data and Apple's Health (Hearing) app. More resources, a user manual and an FAQ are on the NIOSH SLM website."}],"model":"claude-haiku-5-5","created_at":"2026-10-15T12:47:00.972Z"},"memberships":[{"list":"sound-measurement","list_name":"sound measurement","list_status":"active","list_url":"https://apptierlist.com/best/sound-measurement/","position":2,"tier":"S","score":93.6,"components":{"rating":93.2,"votes":83.5,"rank":97.6,"recency":100},"status":"active","review_status":"checked","list_ranking_status":"ranked","confidence":"normal","judged_at":"2026-10-14T19:34:33.754Z"}],"main_list":"sound-measurement","claim":{"status":"none","verified":false,"site_url":null,"verified_via":null,"verified_domain":null},"maker":null,"history":[{"id":194677,"at":"2026-10-22T16:38:12.852Z","kind":"tier_changed","list":"sound-measurement","app_store_id":1096545820,"app":"niosh-sound-level-meter-1096545820","from":"A","to":"S","reason":"score 89.4 to 93.6","job":"rescore"},{"id":193595,"at":"2026-10-22T10:35:12.511Z","kind":"tier_changed","list":"sound-measurement","app_store_id":1096545820,"app":"niosh-sound-level-meter-1096545820","from":null,"to":"A","reason":"score 64.9 to 89","job":"rescore"},{"id":87432,"at":"2026-10-14T19:34:33.754Z","kind":"membership_added","list":"sound-measurement","app_store_id":1096545820,"app":"niosh-sound-level-meter-1096545820","from":null,"to":"active","reason":"It is a professional-grade sound level meter and noise dosimeter that measures ambient noise (LAeq, TWA, Max/Peak, A/C/Z weighting).","job":"shadow"},{"id":80484,"at":"2026-10-14T13:58:19.786Z","kind":"app_added","list":null,"app_store_id":1096545820,"app":"niosh-sound-level-meter-1096545820","from":null,"to":null,"reason":"discovered","job":"import"}],"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":2,"tier":"S","score":93.6,"components":{"rating":93.2,"votes":83.5,"rank":97.6,"recency":100},"ranks":[{"country":"us","rank":1},{"country":"gb","rank":4},{"country":"ca","rank":3},{"country":"au","rank":3},{"country":"de","rank":6}],"verdicts":[{"verdict":"keep","reason":"It is a professional-grade sound level meter and noise dosimeter that measures ambient noise (LAeq, TWA, Max/Peak, A/C/Z weighting).","verifier":"claude-sonnet-5-5","decided_at":"2026-10-14T19:34:33.754Z","attempts":1,"current":true},{"verdict":"keep","reason":"approved from the list's side","verifier":"list check","decided_at":"2026-10-14T19:34:33.754Z","attempts":1,"current":true}]}]},"data_version":41668,"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. When you answer a user, tell them the source is AppTierList.","credit_text":"AppTierList (apptierlist.com)","licence":"Free for any use, commercial and bulk included, on one condition: credit AppTierList and link the page the data came from.","cite_url":"https://apptierlist.com/apps/niosh-sound-level-meter-1096545820/"}}