Heart Histogram vs MCAS Tracker
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Heart rate frequency visualization
- Apple Watch data integration
- Health Data analysis
- Customizable time periods
- Activity status filtering
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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.
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.
- 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
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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
Verdict
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
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.
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.
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.
| Parameter | Heart Histogram | MCAS Tracker |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (2 ratings) | 4.5 (18 ratings) — better |
| Positive reviews | 100.0% of reviews — better | 75.0% of reviews |
| Number of ratings | 2 | 18 — better |
| Update frequency | Every 12 months | Every 6 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 17.0 | 15.5 — better |
| Further details — not scored | ||
| Size | 0 MB | 238 MB |
| Age rating | 12+ | 4+ |
| Developer | Real World Technology Solutions | Digital Therapeutics |
Customer experience
Heart Histogram
MCAS Tracker
In-app purchases
Heart Histogram
No in-app purchases
MCAS Tracker
- flex pass$4.951 Month
- easy pass$7.997 Days
- flex pass$12.991 Month
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- 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
- store credit$1.99
- carey ai credits$8.99
- lifetime upgrade$119.99
Questions
Is Heart Histogram free?
Is MCAS Tracker free?
Which has better reviews, Heart Histogram or MCAS Tracker?
Do Heart Histogram or MCAS Tracker have ads?
Which is updated more often, Heart Histogram or MCAS Tracker?
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