{"app_store_id":833728910,"slug":"diagnosaurus-ddx-833728910","name":"Diagnosaurus® DDx","short_name":"Diagnosaurus® DDx","subtitle":"Best-selling DDx app worldwide","icon_url":"https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/de/fa/70/defa7061-f313-8183-712a-d2156316b201/AppIcon-0-0-1x_U007epad-0-1-0-85-220.png/512x512bb.jpg","icon_tint":"#242770","store_url":"https://apps.apple.com/us/app/diagnosaurus-ddx/id833728910?uo=4","price":0,"currency":"USD","rating":4.8308,"rating_count":2506,"rating_worldwide":4.815,"rating_count_worldwide":3824,"in_app_purchases":true,"recent_rating":null,"recent_review_count":null,"reviews_checked_at":"2026-11-12T21:04:12.997Z","primary_genre":"Medical","version_date":"2026-10-17T18:51:01Z","updated_at":"2026-11-11T01:29:12.610Z","stale":false,"missing_since":null,"one_liner":"Quick-reference app that lets healthcare professionals search over 1,000 differential diagnoses by organ system.","verified_maker":false,"maker_site":null,"file_size_bytes":19995648,"minimum_os":"15.0","content_rating":"17+","language_count":1,"screenshots":["https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/6c/b4/2e/6cb42e6c-f21d-cfed-c242-023990960742/d806e087-3ebb-408b-9d16-4948112185ba_diagno_iphone_5.5_1.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/33/e9/33/33e9332f-9a83-11fe-8a7a-aa25809f1c15/a378e41b-0e57-42cd-986a-bf9a210a004b_diagno_iphone_5.5_2.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/42/94/79/4294795b-b959-5763-ac06-ab248f2c3ddb/c179624e-8df6-4b21-8ad2-f63d4077255b_diagno_iphone_5.5_3.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/7c/cd/d1/7ccdd1ad-9d58-cae3-14b2-aedb51ee3eba/4eb49948-7e49-4b95-b95a-e4b7f7563924_diagno_iphone_5.5_4.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/50/87/8f/50878f20-68cc-37b6-1f01-07073165531e/2f904fed-5801-43e7-9a98-eb32f7d5bf28_diagno_iphone_5.5_5.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/f9/6a/cf/f96acfaf-c7f0-176b-b0cb-df5bdd4181a4/fa008598-1e5d-4d27-8209-af0511376f2c_diagno_iphone_5.5_6.png/392x696bb.png"],"developer_name":"Unbound Medicine, Inc.","editors_choice":false,"url":"https://apptierlist.com/apps/diagnosaurus-ddx-833728910/","api_url":"https://apptierlist.com/api/v1/apps/diagnosaurus-ddx-833728910","schema_version":"1.0","generated_at":"2026-11-14T19:29:38.759Z","data_as_of":"2026-11-14T05:31:12.669Z","description":"** Top-Selling App Used by Tens of Thousands of Health Professionals, Worldwide ** \n\nABOUT DIAGNOSAURUS DDX\nThis quick-reference tool helps healthcare professionals perform differential diagnosis with speed and confidence at the point of care. With Diagnosaurus you can quickly search over 1,000 diagnoses by organ system, symptom, or disease, or you can view all entries. Use the valuable “See Related DDx” feature within each entry to consider alternative diagnoses and quickly link to those entries. The convenient “Favorites” feature allows you to save specific searches and bookmark in your personal archive. \n\nFEATURES \n• More than 1,000 differential diagnoses\n• Highlight and make custom notes within entries\n• Entries organized in quick-read format\n• “See Related DDx” links to other potential diagnoses\n• Disease, symptom, and organ system indexes\n• “Favorites” for bookmarking important entries\n• Universal Index Search to help find answers fast\n\nAuthor: Roni F. Zeiger, MD \nPublisher: McGraw-Hill Medical\nPowered by: Unbound Medicine","facts":{"developer_id":300420400,"developer_url":"https://www.unboundmedicine.com/products/iphone","first_released":"2014-03-19T00:30:54Z","support_url":"https://www.unboundmedicine.com/support/iphone","privacy_url":"http://www.unboundmedicine.com/privacy","website_url":"https://www.unboundmedicine.com/products/iphone","app_version":"1.15","release_notes":"This update adds support for iPhone Duo and ensures full compatibility with the latest iOS 27 release, delivering a more reliable experience with improved performance and stability.\n\nWe're always here to help—if you have any questions or feedback, please contact Unbound Medicine Support at support@unboundmedicine.com","rating_current_version":4.8308,"rating_count_current_version":2506,"star_counts":[37,18,40,142,2269],"genres":["Medical","Health & Fitness"],"languages":["EN"],"content_advisories":["Frequent/Intense Medical/Treatment Information"],"device_families":["mac","iphone","ipad","ipod"],"made_for_iphone_duo":false,"chart":null},"freshness":{"apple_read_at":"2026-11-11T01:29:12.610Z","catalog_read_at":"2026-11-03T20:06:12.704Z","reviews_checked_at":"2026-11-12T21:04:12.997Z","summary_written_at":"2026-11-03T06:36:12.917Z","placed_at":"2026-10-19T09:13:11.601Z","scored_at":"2026-11-14T05:31:12.669Z"},"editorial":{"one_liner":"Quick-reference app that lets healthcare professionals search over 1,000 differential diagnoses by organ system.","what_is":"Diagnosaurus DDx is a medical reference app for differential diagnosis. Entries are in a quick-read format and can be searched by disease, symptom, or organ system, or browsed in full. Users can save favorites, make custom notes, and follow related diagnosis links.","good_for":["Looking up possible diagnoses for a symptom","Browsing differential diagnoses by organ system","Saving and annotating frequently used diagnosis entries"],"pricing":"Diagnosaurus® DDx is free to download, with in-app purchases on the App Store.","faq":[{"q":"How many diagnoses does the app cover?","a":"The listing states more than 1,000 differential diagnoses, which can be searched by organ system, symptom, or disease, or viewed as a full list."},{"q":"Who is the app intended for?","a":"The listing describes it as a quick-reference tool for healthcare professionals performing differential diagnosis at the point of care."}],"model":"claude-haiku-5-5","created_at":"2026-11-03T06:36:12.917Z"},"memberships":[{"list":"medical-diagnosis","list_name":"medical diagnosis","list_status":"active","list_url":"https://apptierlist.com/best/medical-diagnosis/","position":1,"tier":"S","score":91.1,"components":{"rating":96.3,"votes":75.8,"rank":92.2,"recency":100},"status":"active","review_status":"checked","list_ranking_status":"ranked","confidence":"normal","judged_at":"2026-10-19T09:13:11.601Z"}],"main_list":"medical-diagnosis","claim":{"status":"none","verified":false,"site_url":null,"verified_via":null,"verified_domain":null},"maker":null,"history":[{"id":288656,"at":"2026-11-11T00:30:12.853Z","kind":"tier_changed","list":"medical-diagnosis","app_store_id":833728910,"app":"diagnosaurus-ddx-833728910","from":null,"to":"S","reason":"list left review: 6 or more members checked, ranked #1","job":"rescore"},{"id":174020,"at":"2026-10-19T09:13:11.601Z","kind":"membership_added","list":"medical-diagnosis","app_store_id":833728910,"app":"diagnosaurus-ddx-833728910","from":null,"to":"active","reason":"Differential diagnosis reference for clinicians with 1,000+ diagnoses searchable by symptom, organ system, or disease, with related DDx links.","job":"shadow"},{"id":169500,"at":"2026-10-19T05:08:11.787Z","kind":"app_added","list":null,"app_store_id":833728910,"app":"diagnosaurus-ddx-833728910","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":"medical-diagnosis","list_name":"medical diagnosis","status":"active","review_status":"checked","position":1,"tier":"S","score":91.1,"components":{"rating":96.3,"votes":75.8,"rank":92.2,"recency":100},"ranks":[{"country":"us","rank":5},{"country":"gb","rank":11},{"country":"ca","rank":8},{"country":"au","rank":10},{"country":"de","rank":10}],"verdicts":[{"verdict":"keep","reason":"Differential diagnosis reference for clinicians with 1,000+ diagnoses searchable by symptom, organ system, or disease, with related DDx links.","verifier":"claude-sonnet-5-5","decided_at":"2026-10-19T09:13:11.601Z","attempts":1,"current":true},{"verdict":"keep","reason":"A differential diagnosis tool for clinicians. You search by symptom or organ system and get a list of possible conditions, which matches the intent of working out what could be causing health problems. It is a structured diagnostic aid, not just health articles.","verifier":"list check","decided_at":"2026-10-19T09:13:11.601Z","attempts":1,"current":true}]}]},"data_version":62750,"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/diagnosaurus-ddx-833728910/"}}