# WatchME vs MCAS Tracker

The clearest difference is in-app purchases: WatchME at none against MCAS Tracker's 16. WatchME also leads on update cadence (every 6 weeks vs every 6 months) and review sentiment (88% vs 75%). MCAS Tracker's advantage is device support (4 vs 2) and iOS requirement (15.5 vs 18.6). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.5 for WatchME against 4.4 for MCAS Tracker. Both are backed by a comparable volume of ratings — 17 and 21 respectively. Written reviews are what separate them: 88% of WatchME's written reviews are positive against 75% of MCAS Tracker's.

WatchME ships an update every 6 weeks, MCAS Tracker every 6 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | WatchME | MCAS Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (17 ratings)](https://appshunter.io/ios/app/watchme/id1583153009/reviews)** | [4.4 (21 ratings)](https://appshunter.io/ios/app/mcas-tracker/id6754931863/reviews) |
| Number of ratings | 17 | **21** |
| Positive reviews | **88.5% of reviews** | 75.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 6 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 14 MB | 238 MB |
| Requires iOS | 18.6 | **15.5** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 12+ | 4+ |
| Developer | [David Davies-Payne](https://appshunter.io/developer/1583153011) | [Digital Therapeutics](https://appshunter.io/developer/1721663167) |

## What reviewers say

### WatchME

[App page](https://appshunter.io/ios/app/watchme/id1583153009)

This app assists individuals diagnosed with ME/CFS in managing their energy levels by monitoring daily heart rate, stand time, steps, and distance. It integrates with HealthKit to track various health metrics and allows users to set personalized thresholds for alerts on their phone and watch.

**Highlights:** Pacing within capacity envelope, Heart rate monitoring, Stand time tracking, Step and distance tracking, HealthKit integration, Customizable alert thresholds, Watch face complications for alerts

**Features:** Apple Watch app

**In-app purchases:** none


### 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 (16)**

| Purchase | Price | Billing |
| --- | --- | --- |
| flex pass | $4.95 | per month |
| easy pass | $7.99 | per 7 days |
| flex pass | $12.99 | per month |
| carey ai max | $19.99 | per month |
| yearly access | $19.99 | per year |
| smart pass | $19.99 | per year |
| carey ai ultra | $29.99 | per month |
| plus | $29.99 | per year |
| limited discount | $34.99 | per year |
| Premium Yearly | $34.99 | per year |
| yearly access | $39.99 | per year |
| Extended Trial | $39.99 | per year |
| full access | $49.99 | per year |
| store credit | $1.99 | one-time |
| carey ai credits | $8.99 | one-time |
| lifetime upgrade | $119.99 | one-time |


## Frequently asked questions

### Is WatchME free?

WatchME 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, WatchME or MCAS Tracker?

WatchME is rated higher. WatchME averages 4.5 out of 5 from 17 ratings, while MCAS Tracker averages 4.4 from 21 ratings.

### Do WatchME or MCAS Tracker have ads?

Neither WatchME nor MCAS Tracker shows ads.

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

WatchME ships an update every 6 weeks, and MCAS Tracker every 6 months. Most recently, WatchME was updated on October 24, 2026 and MCAS Tracker on October 24, 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.*