Comparison

Heart Histogram vs MCAS Tracker

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Heart Histogram

Visualize your heart rate patterns with detailed histograms. This app analyzes data from your Apple Watch and Health Data to show heart beat frequency at various rates. Customize the time period and filter by activity status.

Highlights
  • Heart rate frequency visualization
  • Apple Watch data integration
  • Health Data analysis
  • Customizable time periods
  • Activity status filtering
Features
Read full description

The app makes it easy to see how frequently your heart beats at different rates, making use of the data gathered by your Apple Watch and stored in your Health Data. You can select the period from which the data is drawn, and, depending on the model of the Apple Watch you have, you may be able to choose to display any combination of the data that your Watch marked as corresponding to periods where you were sedentary or active.

About

MCAS Tracker

This app helps individuals manage Mast Cell Activation Syndrome by tracking symptoms, food intake, and environmental triggers. It offers advanced analytics to identify patterns and provides secure, exportable reports for healthcare providers. The app aims to offer clarity and actionable insights for better health management.

Highlights
  • Symptom tracking (hives, itching, flushing)
  • Food and supplement logging
  • Trigger identification (environmental, emotional)
  • Advanced analytics and correlation analysis
  • Medication tracking
  • Daily health journal
  • Secure, exportable reports
Features
Read full description

This MCAS Tracker helps you manage mast cell activation symptoms through structured tracking, advanced analytics, and personalized insights. Designed for people living with Mast Cell Activation Syndrome, it provides clarity around reactions, histamine triggers, and symptom cycles, helping you understand what causes flare-ups and how to prevent them. With precise tools for daily tracking, it transforms complex data into actionable health insights. Track and Understand Your Reactions - Quick symptom tracking - Record hives, itching, flushing, headaches, GI distress, or breathing issues in seconds to capture your full experience. - Food and supplement logs - Track meals, ingredients, and supplements to uncover patterns that cause histamine intolerance or trigger mast cell reactions. - Trigger identification - Log environmental, emotional, and seasonal factors to discover what contributes to your flare-ups. - Advanced analytics - View charts and correlations linking food, stress, sleep, and reactions to pinpoint your top triggers and patterns over time. - Medication tracking - Log antihistamines, mast cell stabilizers, or EpiPen use to monitor effectiveness and consistency. - Daily health journal - Combine symptom notes, mood, and activity levels for a complete picture of your condition each day. - Secure, exportable reports - Generate PDF or CSV summaries to share with allergists, immunologists, or healthcare providers for data-driven care. - Encrypted storage - Protect sensitive health data with strong encryption and optional Face ID or Touch ID authentication. Built for Daily Use - Simple, user-friendly design - Quickly record symptoms and insights without extra effort. - Apple Health integration - Sync metrics like heart rate, sleep, and activity to understand how physical health impacts mast cell responses. - Personalized reminders - Stay on track with alerts for medications, hydration, meals, or journaling. - Goal tracking - Set goals like reducing flare frequency or improving sleep quality and visualize progress through trend charts. - Correlation analysis - Identify which foods, times, or environments consistently cause flare-ups or relief. - Offline and cloud backup - Log entries anytime with automatic syncing when reconnected. - Regular updates - Access new tools and refinements designed to make symptom tracking effortless and accurate. Go Beyond Reaction Tracking - Custom MCAS tracker plan - Follow guided steps to monitor symptoms, medications, and triggers across days or weeks. - Comprehensive health record - Track everything from diet, supplements, sleep, and bowel patterns to stress and emotional states in one connected system. - Educational insights - Learn about mast cell activation, low-histamine diets, and lifestyle adjustments that support stability. - Lab and test logging - Record lab results and notes from medical appointments to maintain a complete personal health record. - Activity and wellness tracking - Track rest, exercise, and stress to balance recovery and prevent overexertion. Start Managing MCAS with Confidence Setup is fast - start logging symptoms, tracking reactions, and uncovering your personal triggers in minutes. Choose a flexible subscription plan and manage it directly through the Apple Store. Every feature in this tracker is built to help you identify patterns, reduce uncertainty, and feel more in control of your health. Transform data into understanding and find the balance your body needs. Start tracking today to uncover your triggers and take the next step toward stability and better quality of life. Any insights provided by this MCAS Tracker do not constitute medical advice. The app is designed for tracking purposes only and is not intended to diagnose, treat, cure, or prevent any disease or condition. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Heart Histogram3 screens
MCAS Tracker4 screens

Verdict

The call

The clearest difference is rating: MCAS Tracker at 4.5 against Heart Histogram's 4.0. MCAS Tracker also leads on ratings volume (18 vs 2) and device support (4 vs 1). Heart Histogram's advantage is in-app purchases (none vs 16) and review sentiment (100% vs 75%). On price, update cadence and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. MCAS Tracker sells 16 in-app purchases, starting at $4.95 per month. Heart Histogram asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

MCAS Tracker holds the better App Store score, 4.5 against 4.0. That said, the two scores are not equally well evidenced: MCAS Tracker has 18 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 100% of Heart Histogram's written reviews are positive against 75% of MCAS Tracker's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Heart Histogram ships an update every 12 months, MCAS Tracker every 6 months. The most recent releases landed on August 20, 2026 and September 20, 2026 respectively.

Scorecard7 real differences · 3 level
Heart Histogram versus MCAS Tracker: the parameters behind the verdict, then further details
ParameterHeart HistogramMCAS Tracker
PriceFreeFree
Rating4.0 (2 ratings)4.5 (18 ratings) — better
Positive reviews100.0% of reviews — better75.0% of reviews
Number of ratings218 — better
Update frequencyEvery 12 monthsEvery 6 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhoneiPhone, iPad, iPod, Apple Watch — better
Requires iOS17.015.5 — better
Further details — not scored
Size0 MB238 MB
Age rating12+4+
DeveloperReal World Technology SolutionsDigital Therapeutics

Customer experience

Heart Histogram

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

MCAS Tracker

All ratings18 ratings
Positive83.3%
Neutral11.1%
Negative5.6%
Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

In-app purchases

None

Heart Histogram

No in-app purchases

16 purchases

MCAS Tracker

Subscriptions13
  • flex pass$4.951 Month
  • easy pass$7.997 Days
  • flex pass$12.991 Month
Show 10 more
  • carey ai max$19.991 Month
  • yearly access$19.991 Year
  • smart pass$19.991 Year
  • carey ai ultra$29.991 Month
  • plus$29.991 Year
  • limited discount$34.991 Year
  • Premium Yearly$34.991 Year
  • yearly access3 Days trial$39.991 Year
  • Extended Trial3 Days trial$39.991 Year
  • full access7 Days trial$49.991 Year
One-time3
  • store credit$1.99
  • carey ai credits$8.99
  • lifetime upgrade$119.99

Questions

Is Heart Histogram free?
Heart Histogram is free to download, with no in-app purchases.
Is MCAS Tracker free?
MCAS Tracker is free to download, with in-app purchases available.
Which has better reviews, Heart Histogram or MCAS Tracker?
MCAS Tracker is rated higher. Heart Histogram averages 4.0 out of 5 from 2 ratings, while MCAS Tracker averages 4.5 from 18 ratings.
Do Heart Histogram or MCAS Tracker have ads?
Neither Heart Histogram nor MCAS Tracker shows ads.
Which is updated more often, Heart Histogram or MCAS Tracker?
Heart Histogram ships an update every 12 months, and MCAS Tracker every 6 months. Most recently, Heart Histogram was updated on August 20, 2026 and MCAS Tracker on September 20, 2026.

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