{"app_store_id":1515811220,"slug":"units-converter-calculator-1515811220","name":"Units Converter & Calculator","short_name":"Units Converter & Calculator","subtitle":"200+ Units, Physics Constants","icon_url":"https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/d8/96/c3/d896c318-4de7-fa13-5381-2b28f5c2d129/AppIcon-0-0-1x_U007emarketing-0-11-0-85-220.png/512x512bb.jpg","icon_tint":null,"store_url":"https://apps.apple.com/us/app/units-converter-calculator/id1515811220?uo=4","price":0,"currency":"USD","rating":4.71875,"rating_count":32,"rating_worldwide":4.71875,"rating_count_worldwide":32,"in_app_purchases":true,"recent_rating":null,"recent_review_count":null,"reviews_checked_at":null,"primary_genre":"Productivity","version_date":"2026-07-08T02:32:25Z","updated_at":"2026-11-02T01:22:12.857Z","stale":false,"missing_since":null,"one_liner":"Converts units across 30+ categories and includes a reference of 180+ physical constants, offline and ad-free.","verified_maker":false,"maker_site":null,"file_size_bytes":180563968,"minimum_os":"16.0","content_rating":"4+","language_count":95,"screenshots":["https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/01/16/82/0116823d-02ca-0911-a540-fa7044eabd45/iphone_01.png/320x480bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/22/2a/31/222a3158-70f2-4129-5e57-dbe15de3c6b2/iphone_02.png/320x480bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/31/53/3f/31533f59-98cd-30c9-78a8-90afdc7318a6/iphone_03.png/320x480bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/91/d9/e9/91d9e9eb-cdf9-0895-d4e7-837ccc465561/iphone_04.png/320x480bb.jpg"],"developer_name":"Alok Singh","editors_choice":false,"url":"https://apptierlist.com/apps/units-converter-calculator-1515811220/","api_url":"https://apptierlist.com/api/v1/apps/units-converter-calculator-1515811220","schema_version":"1.0","generated_at":"2026-11-04T11:07:04.468Z","data_as_of":"2026-11-04T09:25:13.014Z","description":"The Ultimate Unit Converter, Physics Constants & Learning App\n\nConvert 200+ units across 30+ categories instantly — completely offline and ad-free. Master physics with 180+ constants, interactive learning modes, and challenge games. Perfect for students, engineers, scientists, and professionals.\n\nKEY FEATURES:\n\nCOMPREHENSIVE CONVERSIONS\n• 30+ conversion categories including Weight, Temperature, Distance, Speed, Volume, Energy, Pressure, and more\n• 200+ units across all categories\n• Real-time conversions with instant results\n\nPHYSICAL CONSTANTS LIBRARY\n• 180+ physical constants with detailed explanations\n• Search functionality to quickly find any constant\n• Each constant includes:\n  - What it is: Clear explanation\n  - Why it's important: Significance in physics\n  - How it's used: Practical applications\n  - Interesting facts: Fascinating insights\n• Covers fundamental constants, particle physics, thermodynamics, astronomy, and more\n\nLEARNING MODES\n• Quick Convert: Instant results for fast conversions\n• Learn Mode: Guided discovery with progressive hints\n• Challenge Mode: Test your estimation skills\n• Track your progress across all categories\n\nPROGRESS TRACKING\n• Monitor your learning progress\n• View hint usage statistics\n• Track challenge scores\n• See completion across all 30 categories\n\nPREMIUM DESIGN\n• Beautiful, modern interface\n• Smooth animations and transitions\n• Intuitive navigation\n• Professional look and feel\n\nCONVERSION HISTORY\n• Automatic saving of all conversions\n• Easy access to past calculations\n• Organized by category\n• Clean, readable format\n\nSMART FEATURES\n• Auto-save conversions\n• Keyboard-friendly interface\n• Search and filter constants\n• Real-world reference examples\n\nPerfect for:\n• Students learning physics and chemistry\n• Engineers and scientists\n• Professionals needing quick conversions\n• Anyone working with units and constants\n\nDownload now and experience the most comprehensive unit converter with an extensive physical constants reference!","facts":{"developer_id":1508795536,"developer_url":"https://bestlatestapps.com/apps/units-converter/","first_released":"2020-05-30T07:00:00Z","support_url":"https://bestlatestapps.com/apps/units-converter/contact","privacy_url":"https://bestlatestapps.com/apps/units-converter/privacy","website_url":"https://bestlatestapps.com/apps/units-converter/","app_version":"2026.07.06","release_notes":"Bug fixes and performance improvement","rating_current_version":4.71875,"rating_count_current_version":32,"star_counts":[1,0,1,3,27],"genres":["Productivity","Education"],"languages":["AF","SQ","AM","AR","HY","AZ","EU","BN","BS","BG","MY","KM","CA","NY","HR","CS","DA","NL","EN","FI","FR","FY","GD","GL","KA","DE","EL","GU","HA","HE","HI","HU","IS","IG","ID","GA","IT","JA","JV","KN","KK","RW","KO","KU","KY","LO","LT","LB","MK","MG","MS","ML","MT","MR","MN","NE","NB","OR","OM","PS","FA","PL","PT","PA","RO","RU","SR","ST","SN","ZH","SD","SI","SK","SL","SO","ES","SU","SW","SV","TG","TA","TT","TE","TH","ZH","TR","TK","UK","UR","UZ","VI","CY","XH","YO","ZU"],"content_advisories":null,"device_families":["mac","iphone","ipad"],"made_for_iphone_duo":false,"chart":null},"freshness":{"apple_read_at":"2026-11-02T01:22:12.857Z","catalog_read_at":"2026-10-30T01:02:13.223Z","reviews_checked_at":null,"summary_written_at":"2026-10-30T01:54:12.903Z","placed_at":"2026-10-30T01:31:12.634Z","scored_at":"2026-11-04T09:25:13.014Z"},"editorial":{"one_liner":"Converts units across 30+ categories and includes a reference of 180+ physical constants, offline and ad-free.","what_is":"Units Converter & Calculator is a productivity app for converting 200+ units across 30+ categories, such as weight, temperature, distance, speed, and energy. It also includes a physical constants library with 180+ entries, learning modes, and progress tracking.","good_for":["Students learning physics or chemistry","Engineers and scientists needing unit conversions","Looking up physical constants with explanations"],"pricing":"Units Converter & Calculator is free to download, with in-app purchases on the App Store.","faq":[{"q":"Does it work offline?","a":"The app converts units completely offline and is ad-free. It also states that all conversions are saved automatically in a history organized by category."},{"q":"Is it free to install?","a":"It is free to download. The App Store lists in-app purchases, but the listing does not state their prices or what they unlock."},{"q":"What does the constants library include?","a":"It lists 180+ physical constants. Each entry has an explanation, its importance in physics, how it is used, and interesting facts, and a search function helps find a specific constant."}],"model":"claude-haiku-5-5","created_at":"2026-10-30T01:54:12.903Z"},"memberships":[{"list":"unit-conversion","list_name":"unit conversion","list_status":"active","list_url":"https://apptierlist.com/best/unit-conversion/","position":17,"tier":"C","score":60,"components":{"rating":94.4,"votes":55.1,"rank":0,"recency":90.7},"status":"active","review_status":"checked","list_ranking_status":"ranked","confidence":"provisional","judged_at":"2026-10-30T01:31:12.634Z"}],"main_list":"unit-conversion","claim":{"status":"none","verified":false,"site_url":null,"verified_via":null,"verified_domain":null},"maker":null,"history":[{"id":249680,"at":"2026-10-30T01:42:13.259Z","kind":"tier_changed","list":"unit-conversion","app_store_id":1515811220,"app":"units-converter-calculator-1515811220","from":null,"to":"C","reason":"score 60.2","job":"rescore"},{"id":249612,"at":"2026-10-30T01:31:12.634Z","kind":"membership_added","list":"unit-conversion","app_store_id":1515811220,"app":"units-converter-calculator-1515811220","from":null,"to":"active","reason":"Converts 200+ units across 30+ categories instantly and offline, which is the core job named in the title and subtitle.","job":"shadow"}],"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":"unit-conversion","list_name":"unit conversion","status":"active","review_status":"checked","position":17,"tier":"C","score":60,"components":{"rating":94.4,"votes":55.1,"rank":0,"recency":90.7},"ranks":[],"verdicts":[{"verdict":"keep","reason":"Converts 200+ units across 30+ categories instantly and offline, which is the core job named in the title and subtitle.","verifier":"claude-sonnet-5-5","decided_at":"2026-10-30T01:31:12.634Z","attempts":1,"current":true},{"verdict":"keep","reason":"Its core purpose is converting 200+ units across 30+ categories. 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