{"app_store_id":1441365703,"slug":"key-to-health-metabolic-ai-1441365703","name":"Key to Health: Metabolic AI","subtitle":null,"icon_url":"https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/ee/7e/16/ee7e1663-206e-12b9-60f8-ee86ef967504/AppIcon-0-0-1x_U007epad-0-1-0-sRGB-85-220.png/512x512bb.jpg","store_url":"https://apps.apple.com/us/app/key-to-health-metabolic-ai/id1441365703?uo=4","price":0,"currency":"USD","rating":4.75298,"rating_count":2255,"in_app_purchases":null,"recent_rating":null,"recent_review_count":null,"reviews_checked_at":null,"primary_genre":"Health & Fitness","version_date":"2026-10-05T16:54:16Z","updated_at":"2026-10-23T04:37:17.911Z","stale":false,"missing_since":null,"one_liner":"Health app that tracks fat metabolism with a breath acetone sensor and coaches daily habits with an AI guide named Key.","verified_maker":false,"maker_site":null,"file_size_bytes":52229120,"minimum_os":"15.6","content_rating":"17+","language_count":1,"screenshots":["https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/90/c3/69/90c369d3-3bd2-9dc2-d831-fcf89cba71a2/iPhone_17_Pro_Max-01Dashboard.png/320x480bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/3e/3e/44/3e3e44e7-584d-73ca-4e47-49cdd09bc504/iPhone_17_Pro_Max-02Journal.png/320x480bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/c1/e3/f8/c1e3f8e1-8f90-8712-ebc0-390062fe2aa1/iPhone_17_Pro_Max-03Journey.png/320x480bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/4e/4a/90/4e4a904c-6cf0-ac37-ddd5-00fa780bbcba/iPhone_17_Pro_Max-04Measuring.png/320x480bb.jpg"],"developer_name":"Keyto, Inc.","editors_choice":null,"url":"https://apptierlist.com/apps/key-to-health-metabolic-ai-1441365703/","api_url":"https://apptierlist.com/api/v1/apps/key-to-health-metabolic-ai-1441365703","schema_version":"1.0","generated_at":"2026-10-24T01:40:50.626Z","data_as_of":"2026-10-23T20:57:13.247Z","description":"Finally understand what's working for your body—no guesswork, no gimmicks.\n\nKey to Health is designed for high-achieving, busy people who want to look better, feel better, and optimize their long-term health without spending hours on complex routines.\n\nBacked by science. Guided by AI. Built for real life.\n\nOur breath sensor gives you real-time feedback on your body's fat metabolism—so you can see what your daily choices are actually doing, not just hope for the best. Pair that with smart AI coaching, and you have a system that adapts to you.\n\nWhat you'll get:\n• Real-time fat metabolism tracking with our breath acetone sensor\n• Personalized coaching from Key, your AI health guide\n• Clear, science-based goals and progress tracking\n• Tools to build strength and support long-term health\n• Eat what you love—no restricted foods, no keto required\n\nMeet Key: Your 24/7 AI Coach\nKey learns from your habits, adjusts your plan, and guides you every step of the way. Instant support and personalized guidance, whenever you need it.\n\nGrounded in clinical evidence. In a published clinical trial, participants following the Key to Health program lost an average of 10% total body weight over 48 weeks.\n\nNo fad diets. No extreme routines. No forbidden foods. Just real progress, made easy.\n\nThis app and breath monitor are for adults 18 years and older.\n\nSubscription pricing and terms:\nKey to Health offers an auto-renewing monthly subscription at $49.99/month to provide you with unlimited access to the Key to Health Premium collection while you maintain an active subscription.\n\nPayment will be charged to your Apple Account when you confirm the initial subscription purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current subscription period. Your account will be charged for renewal within 24 hours prior to the end of the current period at the current subscription price. You may manage your subscription and turn off auto-renewal by going to Settings > Manage Subscription on your device after purchase. Any unused portion of a free trial period, if offered, will be forfeited when you purchase a subscription, where applicable.\n\nRead more about our terms and conditions here:\nTerms of service: https://keytohealth.ai/terms\nPrivacy policy: https://keytohealth.ai/privacy","facts":{"developer_id":1441274260,"developer_url":"https://keytohealth.ai","first_released":"2019-02-08T05:09:57Z","support_url":null,"privacy_url":null,"website_url":null,"app_version":"4.0.10","release_notes":"• Bug fixes and performance improvements","rating_current_version":4.75298,"rating_count_current_version":2255,"star_counts":null,"genres":["Health & Fitness"],"languages":["EN"],"content_advisories":null,"device_families":null,"made_for_iphone_duo":null,"chart":null},"freshness":{"apple_read_at":"2026-10-23T04:37:17.911Z","catalog_read_at":null,"reviews_checked_at":null,"summary_written_at":"2026-10-21T03:17:13.085Z","placed_at":"2026-10-20T00:49:11.525Z","scored_at":"2026-10-23T20:57:13.247Z"},"editorial":{"one_liner":"Health app that tracks fat metabolism with a breath acetone sensor and coaches daily habits with an AI guide named Key.","what_is":"Key to Health is a Health & Fitness app that gives real-time feedback on fat metabolism using a breath acetone sensor. It includes personalized coaching from Key, an AI health guide, along with goal setting, progress tracking, and tools to build strength. The app and breath monitor are for adults 18 and older.","good_for":["Seeing how daily food choices affect fat metabolism","Following a plan without restricted or forbidden foods","Getting AI coaching that adjusts to your habits"],"pricing":"Key to Health: Metabolic AI is free to download on the App Store.","faq":[{"q":"Is the breath sensor included with the app?","a":"The listing describes a breath acetone sensor that provides real-time fat metabolism feedback. It does not state whether the breath monitor is included with the app or sold separately."},{"q":"How much does it cost?","a":"The app is free to download. The listing states an auto-renewing monthly subscription at $49.99/month for unlimited access to the Premium collection. Subscriptions renew unless auto-renew is turned off at least 24 hours before the period."},{"q":"Who is it for, and what results does the listing cite?","a":"The app and breath monitor are for adults 18 and older. The listing cites a published clinical trial in which participants lost an average of 10% total body weight over 48 weeks."}],"model":"claude-haiku-5-5","created_at":"2026-10-21T03:17:13.085Z"},"memberships":[{"list":"health-coaching","list_name":"health coaching","list_status":"active","list_url":"https://apptierlist.com/best/health-coaching/","position":16,"tier":"B","score":79.3,"components":{"rating":94.9,"votes":73.7,"rank":48.6,"recency":100},"status":"active","review_status":"checked","list_ranking_status":"ranked","confidence":"normal","judged_at":"2026-10-20T00:49:11.525Z"},{"list":"biohacking","list_name":"biohacking","list_status":"draft","list_url":null,"position":null,"tier":null,"score":67.1,"components":{"rating":94.9,"votes":73.7,"rank":0,"recency":100},"status":"active","review_status":"checked","list_ranking_status":"under_review","confidence":"provisional","judged_at":"2026-10-20T00:49:11.525Z"}],"main_list":"health-coaching","claim":{"status":"none","verified":false,"site_url":null,"verified_via":null,"verified_domain":null},"maker":null,"history":[{"id":187950,"at":"2026-10-21T02:46:12.731Z","kind":"tier_changed","list":"health-coaching","app_store_id":1441365703,"app":"key-to-health-metabolic-ai-1441365703","from":"D","to":"B","reason":"score 67.1 to 79.3","job":"rescore"},{"id":179511,"at":"2026-10-20T00:55:11.536Z","kind":"tier_changed","list":"health-coaching","app_store_id":1441365703,"app":"key-to-health-metabolic-ai-1441365703","from":null,"to":"D","reason":"score 67.1","job":"rescore"},{"id":179201,"at":"2026-10-20T00:49:11.525Z","kind":"membership_added","list":"health-coaching","app_store_id":1441365703,"app":"key-to-health-metabolic-ai-1441365703","from":null,"to":"active","reason":"Key, the 24/7 AI coach, learns habits, adjusts the plan and guides users toward long-term health goals.","job":"shadow"},{"id":179200,"at":"2026-10-20T00:49:11.525Z","kind":"membership_added","list":"biohacking","app_store_id":1441365703,"app":"key-to-health-metabolic-ai-1441365703","from":null,"to":"active","reason":"A breath acetone sensor gives real-time fat metabolism feedback to optimize long-term health, which fits metabolic optimization and tracking.","job":"shadow"},{"id":172790,"at":"2026-10-19T07:20:12.528Z","kind":"app_added","list":null,"app_store_id":1441365703,"app":"key-to-health-metabolic-ai-1441365703","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":"biohacking","list_name":"biohacking","status":"active","review_status":"checked","position":null,"tier":null,"score":67.1,"components":{"rating":94.9,"votes":73.7,"rank":0,"recency":100},"ranks":[],"verdicts":[{"verdict":"keep","reason":"A breath acetone sensor gives real-time fat metabolism feedback to optimize long-term health, which fits metabolic optimization and tracking.","verifier":"claude-sonnet-5-5","decided_at":"2026-10-20T00:49:11.525Z","attempts":1,"current":true},{"verdict":"keep","reason":"Breath acetone sensor tracking fat metabolism, plus AI coaching to optimize long-term health. That is a biohacking-style tracking and optimization tool, comparable to Bevel and HUMANITY.","verifier":"list check","decided_at":"2026-10-20T00:49:11.525Z","attempts":1,"current":true}]},{"list":"health-coaching","list_name":"health coaching","status":"active","review_status":"checked","position":16,"tier":"B","score":79.3,"components":{"rating":94.9,"votes":73.7,"rank":48.6,"recency":100},"ranks":[{"country":"us","rank":18}],"verdicts":[{"verdict":"keep","reason":"Key, the 24/7 AI coach, learns habits, adjusts the plan and guides users toward long-term health goals.","verifier":"claude-sonnet-5-5","decided_at":"2026-10-20T00:49:11.525Z","attempts":1,"current":true},{"verdict":"keep","reason":"Its core is an AI coach that adapts plans and guides health habits over time, with weight loss, strength and long-term health in scope. 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