# MCAS Tracker vs Histamine Tracker

The clearest difference is ads: MCAS Tracker at none against Histamine Tracker's shown. Histamine Tracker's advantage is update cadence (every 2 days vs every 6 months) and rating (4.8 vs 4.4). On price, ratings volume, in-app purchases and monetization model there is nothing between them.

Both are free to download. MCAS Tracker sells 10 in-app purchases, starting at $7.99 per 7 days and Histamine Tracker sells 5 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Histamine Tracker holds the better App Store score, 4.8 against 4.4. Both are backed by a comparable volume of ratings — 21 and 44 respectively. Written reviews point the same way: 75% of MCAS Tracker's written reviews are positive against 96% of Histamine Tracker's.

MCAS Tracker ships an update every 6 months, Histamine Tracker every 2 days. The most recent releases landed on November 1, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | MCAS Tracker | Histamine Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (21 ratings)](https://appshunter.io/ios/app/mcas-tracker/id6754931863/reviews) | **[4.8 (44 ratings)](https://appshunter.io/ios/app/histamine-tracker-food-diary/id6758752231/reviews)** |
| Number of ratings | 21 | **44** |
| Positive reviews | 75.0% of reviews | **96.4% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 2 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 238 MB | 70 MB |
| Requires iOS | 15.5 | **15.1** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Digital Therapeutics](https://appshunter.io/developer/1721663167) | [Lion, LLC](https://appshunter.io/developer/1874803480) |

## What reviewers say

### MCAS Tracker

[App page](https://appshunter.io/ios/app/mcas-tracker/id6754931863)

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:** macOS Compatibility, Siri integration, Apple Watch app, iMessage stickers, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| easy pass | $7.99 | per 7 days |
| flex pass | $12.99 | per month |
| carey ai max | $19.99 | per month |
| carey ai ultra | $29.99 | per month |
| plus | $29.99 | per year |
| limited discount | $34.99 | per year |
| yearly access | $39.99 | per year |
| Extended Trial | $39.99 | per year |
| carey ai credits | $8.99 | one-time |
| lifetime upgrade | $119.99 | one-time |


### Histamine Tracker

[App page](https://appshunter.io/ios/app/histamine-tracker-food-diary/id6758752231)

This app helps you identify patterns between your food intake and physical symptoms. It offers features like food scanning, symptom logging, and personalized daily findings to help you understand and manage histamine intolerance.

**Highlights:** Scan food with camera for histamine levels, Log meals, symptoms, supplements, and activities, Personalized daily findings to surface patterns, Browse 1,000+ foods rated by histamine level, Export journal and reports for health practitioners, Low-histamine meal ideas and articles

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $9.99 | per month |
| Monthly | $19.99 | per month |
| Yearly | $49.99 | per year |
| Yearly | $59.99 | per year |
| Lifetime Access | $59.99 | one-time |


## Frequently asked questions

### Is MCAS Tracker free?

MCAS Tracker is free to download, with in-app purchases available.

### Is Histamine Tracker free?

Histamine Tracker is free to download, with in-app purchases available.

### Which has better reviews, MCAS Tracker or Histamine Tracker?

Histamine Tracker is rated higher. MCAS Tracker averages 4.4 out of 5 from 21 ratings, while Histamine Tracker averages 4.8 from 44 ratings.

### Do MCAS Tracker or Histamine Tracker have ads?

Histamine Tracker shows ads; MCAS Tracker does not.

### Which is updated more often, MCAS Tracker or Histamine Tracker?

MCAS Tracker ships an update every 6 months, and Histamine Tracker every 2 days. Most recently, MCAS Tracker was updated on November 1, 2026 and Histamine Tracker on November 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*