Log reactions in seconds, uncover hidden patterns, and finally understand what's driving your flares — free, on every device.
Custom severity scales, free-text notes, timestamps, food logs, and environmental factors — all captured the moment it happens, even without signal.
Visual calendar mapping of every logged reaction. Instantly see your best days, your worst, and what changed — then export it all for your next appointment.
Your emergency action plan, medications, allergies, and emergency contacts — always accessible offline. Because MCAS emergencies don't wait for WiFi.
Three screens. Every situation. Designed to be there whenever a reaction hits — wherever you are.
Log reactions in seconds with custom severity scales, free-text notes, and timestamps. Never miss what happened or when.
Visualize your symptom history over days, weeks, and months. Spot trends you'd never catch from memory alone.
Track foods, environments, activities, and medications alongside symptoms to pinpoint what sets off your reactions.
Your full symptom history mapped to a calendar. Instantly understand your good days, your bad days, and what changed.
Export a clean PDF summary of your symptom history formatted for clinical appointments — so every second counts.
One-tap emergency info — medications, allergies, contacts — always available offline. Because reactions don't wait for signal.
Real words from patients, caregivers, and clinicians who use it every day.
"I've tried every health app out there. None of them understood what it's like to live with MCAS — the random triggers, the unpredictable flares. MastCell Tracker is the first one built for us. I finally feel like I have real data to bring to my doctor."
"My daughter has severe MCAS and keeping track of her reactions used to take a spreadsheet, a notebook, and a lot of guesswork. We identified her three worst food triggers within the first month."
"The offline mode is everything. I react in restaurants, parks, gyms — places with no signal. Logging a reaction the moment it happens means my data is actually accurate."
"The PDF reports patients bring to appointments give me a clearer picture in five minutes than months of informal notes. It's made a real difference in how quickly we can refine treatment."