--- title: "Tether - MCAS Tracker - Reviews, Revenue and Downloads in United States | Apple App Store" description: "Tether - MCAS Tracker is the mast cell activation syndrome (MCAS) tracker built for real life with this condition. Log flares, identify food and environmental triggers, track medications, and generate" --- # Tether - MCAS Tracker — United States > Know your triggers ![Tether App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/8e/a8/3e/8ea83ec8-65eb-fa13-270d-916005976ce1/AppIcon-0-0-1x_U007epad-0-1-85-220.png/434x0w.png) **Developer:** [WILLIAM BARRY AGNEW](https://apptail.io/developer/william-barry-agnew-anROsc) **Category:** Medical **Rating:** 5.0/5 (1 ratings) **Price:** Free **Bundle ID:** Barry.Tether **Store:** Apple App Store **Country:** United States **Version:** 1.0 (released 2026-06-24) **Original Release:** 2026-06-23 **Languages:** English **App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id6781950891) **AppTail Page:** [https://apptail.io/app/tether-mcas-tracker-pdaB/united-states](https://apptail.io/app/tether-mcas-tracker-pdaB/united-states) ## Tether Description Tether - MCAS Tracker is the mast cell activation syndrome (MCAS) tracker built for real life with this condition. Log flares, identify food and environmental triggers, track medications, and generate doctor-ready reports — all in a calm, private app designed for the daily reality of living with MCAS, POTS, EDS, and related chronic illness. Your data stays on your device. No third-party analytics. No ads. No accounts. WHAT YOU CAN DO FOR FREE • Log flares with severity, body systems affected, and notes • Track foods, environmental triggers, and medications • Daily check-in and 30-day flare calendar • Search and filter your full history • Saved lists for medications, known triggers, and safe foods • Daily reminders • Emergency contact info • Export all your data as JSON anytime TETHER PREMIUM — separate in-app subscription required Premium unlocks deeper insights: • AI trigger correlation — surface what's most likely setting off your flares • Pattern dashboard with frequency, time-of-day, and severity charts • Doctor-ready PDF report you can share at appointments • Food label scanner for spotting risky ingredients before you eat • Weather and pollen tracking with daily environmental snapshots • Comorbidity panel for POTS, EDS, Long COVID, and Fibromyalgia • Apple Health sync for heart rate, HRV, sleep, and steps All Premium features are clearly marked in the app and require a separate in-app subscription. You can use Tether's core logging features without subscribing. SUBSCRIPTION PRICING • Tether Premium Monthly — $5.99 per month • Tether Premium Annual — $39.99 per year (save 44%) • New subscribers get a 7-day free trial on the monthly plan Payment is charged to your Apple ID at confirmation of purchase. Subscriptions auto-renew unless cancelled at least 24 hours before the end of the current period (or before the free trial ends). Manage or cancel anytime in your App Store account settings. BUILT FOR YOUR REALITY Tether - MCAS Tracker is designed for people who live with chronic illness. The interface is calm, low-stimulus, and built to be usable on bad-pain or low-energy days. No streaks, no gamification, no judgment — just a tool that respects your time and energy. PRIVACY-FIRST Everything you log stays on your device. We don't run servers. We don't share your data with anyone. Apple Health data is read on-device only. Your location is only used to fetch local weather data and is never stored. Privacy Policy: Terms of Use (EULA): DISCLAIMER Tether - MCAS Tracker is a personal health tracking tool. It is not a medical device and does not provide medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for medical concerns. ## Tether Screenshots - [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/05/78/91/05789189-5c56-994c-8fc3-03c359ad75b5/image1.png/1284x2778.png) - [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/c5/05/c3/c505c35f-8e80-147f-1966-d2f8836d1faf/image2.png/1284x2778.png) - [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/fe/d3/cf/fed3cfdc-5e47-3816-dbab-d23322085ff9/image3.png/1284x2778.png) - [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/6f/b8/57/6fb857fa-328a-ee84-bb5e-cc38e3d2396b/image4.png/1284x2778.png) ## Tether Rating Breakdown in United States - 5 stars: 1 (100%) - 4 stars: 0 (0%) - 3 stars: 0 (0%) - 2 stars: 0 (0%) - 1 stars: 0 (0%) ## Tether In-App Purchases | Item | Price | |------|-------| | Tether Premium Annual | $39.99 | | Tether Premium Monthly | $5.99 | ## Apps Similar to Tether - [POTS Care Package](https://apptail.io/app/pots-care-package-taBc/united-states) - [Days Since Goal Tracking](https://apptail.io/app/days-since-goal-tracking-ESGm/united-states) - [IngrediCheck: Food Scanner AI](https://apptail.io/app/ingredicheck-food-scanner-ai-Jiaq/united-states) - [BloodTrends: Bloodwork tracker](https://apptail.io/app/bloodtrends-bloodwork-tracker-ZnGw/united-states) - [MCAS Tracker](https://apptail.io/app/mcas-tracker-hRYx/united-states) - [Histamine Tracker: Food Diary](https://apptail.io/app/histamine-tracker-food-diary-MkMy/united-states) - [MastCell Tracker](https://apptail.io/app/mastcell-tracker-Tcdz/united-states) - [Histamine Food List & Scanner](https://apptail.io/app/histamine-food-list-scanner-peIz/united-states) - [MyPace App](https://apptail.io/app/mypace-app-CZhA/united-states) - [Glycemic Index & Load Scan: GG](https://apptail.io/app/glycemic-index-load-scan-gg-cYMA/united-states) ## Tether Available In - [United States](https://apptail.io/app/tether-mcas-tracker-pdaB/united-states) - [Canada](https://apptail.io/app/tether-mcas-tracker-pdaB/canada) - [Switzerland](https://apptail.io/app/tether-mcas-tracker-pdaB/switzerland) - [Germany](https://apptail.io/app/tether-mcas-tracker-pdaB/germany) - [Denmark](https://apptail.io/app/tether-mcas-tracker-pdaB/denmark) - [Egypt](https://apptail.io/app/tether-mcas-tracker-pdaB/egypt) - [Finland](https://apptail.io/app/tether-mcas-tracker-pdaB/finland) - [United Kingdom](https://apptail.io/app/tether-mcas-tracker-pdaB/united-kingdom) - [Ghana](https://apptail.io/app/tether-mcas-tracker-pdaB/ghana) - [Hong Kong SAR China](https://apptail.io/app/tether-mcas-tracker-pdaB/hong-kong) - [Indonesia](https://apptail.io/app/tether-mcas-tracker-pdaB/indonesia) - [Israel](https://apptail.io/app/tether-mcas-tracker-pdaB/israel) - [Sri Lanka](https://apptail.io/app/tether-mcas-tracker-pdaB/sri-lanka) - [Nigeria](https://apptail.io/app/tether-mcas-tracker-pdaB/nigeria) - [New Zealand](https://apptail.io/app/tether-mcas-tracker-pdaB/new-zealand) - [Oman](https://apptail.io/app/tether-mcas-tracker-pdaB/oman) - [Singapore](https://apptail.io/app/tether-mcas-tracker-pdaB/singapore) - [Australia](https://apptail.io/app/tether-mcas-tracker-pdaB/australia) - [South Africa](https://apptail.io/app/tether-mcas-tracker-pdaB/south-africa) --- ## About AppTail [AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. Track your app's performance, discover ranking keywords, monitor competitors, and analyze market trends. - [Search Apps](https://apptail.io) - [Top Charts](https://apptail.io/top-iphone-apps) - [Sign Up for Full Access](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=footer) *Data provided by [AppTail](https://apptail.io) - Mobile App Intelligence Platform*