See the pattern
behind how
you feel.

Mast Cell Activation Syndrome hides in patterns. The MCT-1 wearable biosensor and companion app turn scattered symptoms into something you can finally read — with over 2,000+ downloads on iPhone and Android.

Download the app Meet the MCT-1

The MastCell Tracker MCT-1 wearable biosensor

2,000+Downloads on iOS & Android

7-dayBattery on a single charge

Real-timeContinuous biosignal capture

NonprofitCare over profit, always

01Why it matters

Most people with MCAS spend years without answers. We built the tools to shorten that.

Inside the MCT-1 biosensor — interactive board

The device

A biosensor made for continuous wear.

The MCT-1 sits against the skin and quietly reads your biosignals around the clock — no wires, no fuss, up to a week between charges. Tap a glowing point to look inside.

Tap a component to open the inspector

Explore the MCT-1 →

The back of the MastCell Tracker MCT-1 wearable biosensor

The app

Months of symptoms, one clear picture.

Symptom scores, trigger correlations, and biosignal trends come together in a dashboard designed with patients — so a rough month becomes a readable story.

01 Log symptoms and triggers in seconds
02 See the patterns behind your flares
03 Export clinician-ready reports

See the app →

02Dispatches

01 MastCell Tracker passes 2,000 downloadsTwo thousand people on iPhone and Android are now making the invisible visible. MilestoneAug 27, 2026 02 Heat, humidity, and MCAS: managing summer flaresWhy heat sets off mast cells, and how continuous tracking helps you stay ahead of a flare. EducationAug 22, 2026 03 Inside the MCT-1 sensor stack: from skin to signalHow layered sensors turn faint physiological signals into clean, continuous data. EngineeringAug 18, 2026 04 Building MCT OS: the software behind the sensorThe on-device system that turns raw biosignals into insight — privately. ProductAug 13, 2026

All news & research →

Care, not profit

We answer to patients, not shareholders — and we're building coverage so cost is never the barrier.

See how coverage works

MastCell Tracker is a nonprofit. Any surplus goes back into research, patient assistance, and access.

Get started

Start reading your body's notes.

Join over 2,000 people already tracking their symptoms, triggers, and biosignals with MastCell Tracker — free on iPhone and Android.

App Store Google Play

MastCell Tracker for iPhone & Android

See the patternbehind howyou feel.

A biosensor made for continuous wear.

Months of symptoms, one clear picture.

Start reading your body's notes.

See the pattern
behind how
you feel.