{"app_store_id":1554264761,"slug":"light-meter-lm-3000-1554264761","name":"Light Meter LM-3000","short_name":"Light Meter LM-3000","subtitle":"Simple & accurate measurement!","icon_url":"https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/45/da/96/45da96c6-e229-b444-3f34-52850e9a6e49/AppIcon-0-0-1x_U007emarketing-0-11-0-85-220.png/512x512bb.jpg","icon_tint":"#3a358b","store_url":"https://apps.apple.com/us/app/light-meter-lm-3000/id1554264761?uo=4","price":0,"currency":"USD","rating":4.50556,"rating_count":2601,"rating_worldwide":4.461814919284468,"rating_count_worldwide":4584,"in_app_purchases":true,"recent_rating":null,"recent_review_count":null,"reviews_checked_at":null,"primary_genre":"Utilities","version_date":"2026-10-22T20:13:05Z","updated_at":"2026-11-02T06:31:14.151Z","stale":false,"missing_since":null,"one_liner":"Measures illuminance (lux or foot-candles) and correlated color temperature (Kelvin) using the iPhone's front-facing.","verified_maker":false,"maker_site":null,"file_size_bytes":23421952,"minimum_os":"15.0","content_rating":"4+","language_count":8,"screenshots":["https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/53/8b/3f/538b3f4e-2be4-faf1-5195-e6877c1d44ea/6d77afd6-f51c-4aee-ac02-d56ee26a9ae3_App_Store_5.5__U2013_1.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/d3/25/e6/d325e625-5c22-a79f-d671-de9a2ce218c4/cdd9b80d-b122-4e78-81ca-42a43c736c7f_App_Store_5.5__U2013_2.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/6a/69/16/6a691645-fbc7-9c86-9a5e-73acaea464e3/7a2636e9-3e28-4878-b237-60adedf14c52_App_Store_5.5__U2013_3.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/d4/88/54/d48854c8-ceb8-a445-05dd-f7c47c3f538f/94998735-cb6e-48d5-94da-bb910ec50a4b_App_Store_5.5.png/392x696bb.png"],"developer_name":"Lightray Innovation GmbH","editors_choice":false,"url":"https://apptierlist.com/apps/light-meter-lm-3000-1554264761/","api_url":"https://apptierlist.com/api/v1/apps/light-meter-lm-3000-1554264761","schema_version":"1.0","generated_at":"2026-11-04T11:00:46.981Z","data_as_of":"2026-11-03T16:55:12.952Z","description":"Turn your smartphone into a professional-grade light meter. Measure illuminance (lux/foot-candle) and color temperature (CCT in Kelvin) with unmatched accuracy — trusted by photographers, engineers, and lighting professionals worldwide.\n\nWhy waste money on a hardware meter when you’re already carrying one in your pocket?\n\nThe LM-3000 offers the same quality and usability as a traditional hardware light meter.\nDeveloped by optics scientists at the Zurich University of Applied Sciences, LM-3000 is the only light meter app scientifically validated for accuracy. It achieves professional-grade precision by leveraging your iPhone's front-facing camera sensor with advanced RAW image processing. Unlike relying on estimates like other apps, it adheres to the ISO/CIE 19476 standard, ensuring measurements you can trust for critical applications.\n\nMEASUREMENTS\n\n⎷ Illuminance in lux or foot-candles\n⎷ Correlated color temperature in kelvin\n\nFEATURES\n\n⎷ Industry-leading accuracy, matching professional high-end lux meters\n⎷ Pre-calibrated for your specific device\n⎷ Excellent low light sensitivity to detect light pollution\n⎷ No ads\n⎷ No Bluetooth and location permission required\n⎷ In-app manual\n⎷ Save peak reading\n⎷ HOLD function with acoustic signal\n⎷ Custom calibration option to align readings to another meter\n\nDIFFUSER REQUIRED\n\nLike every real light meter, the LM-3000 requires a diffuser to measure accurately. A diffuser scatters incoming light evenly on the sensor and prevents hotspots. While it may sound complex, the solution is surprisingly easy. You have two options:\n\n1) Easily build a diffuser yourself in less than a minute using standard printer paper. This is accurate enough for most use cases.\n\n2) Get the dedicated Diffuser Accessory (free worldwide shipping) for best accuracy and convenience. More details on https://lightray.io/diffuser/\n\n(!) Avoid apps that don’t require a diffuser! They are inaccurate because they ignore the basic physics of light measurement.\n\nTRY BEFORE YOU BUY\n\nThe LM-3000 is free to download and comes with a free trial period. The trial period lasts for two non-consecutive days, giving you enough time to see if the app fits your needs. The status of your free trial will be shown as the \"battery level\" on the top right of the LM-3000's display and on the \"Battery Status\" screen.\n\nOnce your light meter's \"battery\" is depleted, you may choose a Charging Option to keep using the app. You can pick what works best for you:\n→ Single Charge — top-up for another 48 hours (perfect for occasional use),\n→ Continuous Charging — a monthly subscription (great if you use it regularly),\n→ Unlimited Battery — a one-time purchase for unlimited lifetime access\n\nLM-3000 is the result of over five years of dedicated research and development, ensuring you get a tool that is precise and reliable. Every in-app purchase supports future development and helps keep the app ad-free for everyone.\nAs a member of 1% for the Planet, we donate at least one percent of all revenue to environmental non-profits — this is our way of giving back.\n\nACCURACY\n\nAccuracy is not an afterthought — Apps developed by Lightray Innovation are developed according to the ISO/CIE 19476 standard. Thanks to RAW image processing and a default calibration per device model they’re able to match the performance of high quality traditional hardware light meters. To ensure quality we rigorously test our apps regularly on upcoming devices.\n\nDOWNLOAD FOR FREE. TRUSTED BY MILLIONS.\n\nLM-3000 is the go-to light meter for photographers, professionals, engineers, and lighting enthusiasts who rely on accurate measurements — not estimates or guesswork. Download for free today and experience the difference!\n\n\nSee the app in action: https://youtu.be/EJW7NfE2qCk\n\n\nTerms and Conditions: https://lightray.io/lightmeter/terms/","facts":{"developer_id":1031383431,"developer_url":"https://lightray.io/lightmeter/","first_released":"2021-03-09T08:00:00Z","support_url":"https://lightray.io/lightmeter/#faq","privacy_url":"https://www.lightray.io/lightmeter/privacy","website_url":"https://lightray.io/lightmeter/","app_version":"4.4.7","release_notes":"Fixed low light measurements for the latest iPhone 18 Pro.","rating_current_version":4.50556,"rating_count_current_version":2601,"star_counts":[176,43,99,255,2028],"genres":["Utilities"],"languages":["EN","FR","DE","IT","JA","ZH","ES","ZH"],"content_advisories":null,"device_families":["iphone","ipad","ipod"],"made_for_iphone_duo":false,"chart":null},"freshness":{"apple_read_at":"2026-11-02T06:31:14.151Z","catalog_read_at":"2026-11-02T06:31:14.151Z","reviews_checked_at":null,"summary_written_at":"2026-11-03T07:46:12.901Z","placed_at":"2026-10-19T07:24:11.993Z","scored_at":"2026-11-03T16:55:12.952Z"},"editorial":{"one_liner":"Measures illuminance (lux or foot-candles) and correlated color temperature (Kelvin) using the iPhone's front-facing.","what_is":"The LM-3000 is a light meter app for iPhone that measures illuminance in lux or foot-candles and correlated color temperature in kelvin. It uses the front-facing camera sensor with RAW image processing and requires a diffuser, which can be built from printer paper or bought as a dedicated accessory. The app is free to download and offers a two-day trial, after which in-app purchases are available.","good_for":["Checking lux levels for photography or film lighting","Detecting light pollution in low light conditions","Aligning readings to another meter with custom calibration"],"pricing":"Light Meter LM-3000 is free to download, with in-app purchases on the App Store.","faq":[{"q":"Do I need a separate diffuser?","a":"Yes, the listing says a diffuser is required for accurate measurement. You can build one from standard printer paper in under a minute, or buy the Diffuser Accessory, which the listing says ships free worldwide."},{"q":"Does the app need Bluetooth or location access?","a":"No. The app requires no Bluetooth and no location permission. It also states that the app has no ads."},{"q":"How does the free trial work?","a":"The trial lasts two non-consecutive days and is shown as the battery level on the display and on the Battery Status screen. Once it is depleted, you can choose a paid charging option to keep using the app."}],"model":"claude-haiku-5-5","created_at":"2026-11-03T07:46:12.901Z"},"memberships":[{"list":"light-metering","list_name":"light metering","list_status":"active","list_url":"https://apptierlist.com/best/light-metering/","position":2,"tier":"A","score":89.2,"components":{"rating":80.3,"votes":76.6,"rank":99.8,"recency":100},"status":"active","review_status":"checked","list_ranking_status":"ranked","confidence":"normal","judged_at":"2026-10-19T07:24:11.993Z"}],"main_list":"light-metering","claim":{"status":"none","verified":false,"site_url":null,"verified_via":null,"verified_domain":null},"maker":null,"history":[{"id":259482,"at":"2026-11-03T14:32:12.808Z","kind":"tier_changed","list":"light-metering","app_store_id":1554264761,"app":"light-meter-lm-3000-1554264761","from":null,"to":"A","reason":"list left review: 6 or more members checked, ranked #2","job":"rescore"},{"id":172838,"at":"2026-10-19T07:24:11.993Z","kind":"membership_added","list":"light-metering","app_store_id":1554264761,"app":"light-meter-lm-3000-1554264761","from":null,"to":"active","reason":"The app is a light meter that measures lux/foot-candles and color temperature, aimed at photographers and lighting professionals.","job":"shadow"},{"id":168364,"at":"2026-10-19T04:05:11.796Z","kind":"app_added","list":null,"app_store_id":1554264761,"app":"light-meter-lm-3000-1554264761","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 an average of the components an app has (four public App Store signals, plus Apple's Editors' Choice badge as 100 where shown, plus ownership as 100 where the maker has verified it with our badge: it shows in components as ownership_verified); nothing is purchasable. Apps whose maker has verified ownership get a small score component, because an active maker is a sign the app is kept up to date. It never decides a tier on its own. Updated daily.","lists":[{"list":"light-metering","list_name":"light metering","status":"active","review_status":"checked","position":2,"tier":"A","score":89.2,"components":{"rating":80.3,"votes":76.6,"rank":99.8,"recency":100},"ranks":[{"country":"us","rank":1},{"country":"gb","rank":1},{"country":"ca","rank":1},{"country":"au","rank":2},{"country":"de","rank":1}],"verdicts":[{"verdict":"keep","reason":"The app is a light meter that measures lux/foot-candles and color temperature, aimed at photographers and lighting professionals.","verifier":"claude-sonnet-5-5","decided_at":"2026-10-19T07:24:11.993Z","attempts":1,"current":true},{"verdict":"keep","reason":"Its main purpose is light metering. It measures illuminance in lux or foot-candles and color temperature with the phone, the same job as Lux Light Meter Pro and the others already in the list.","verifier":"list check","decided_at":"2026-10-19T07:24:11.993Z","attempts":1,"current":true}]}]},"data_version":52837,"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/light-meter-lm-3000-1554264761/"}}