# C19 vs Pacing

The clearest difference is in-app purchases: Pacing at none against C19's 5. Pacing also leads on update cadence (every 4 days vs every 9 days). C19's advantage is review sentiment (25% vs 0%). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. C19 sells 5 in-app purchases, starting at $2.99 per month. Pacing asks for nothing beyond the download.

C19 ships an update every 9 days, Pacing every 4 days. The most recent releases landed on September 18, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | C19 | Pacing |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **25.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 4 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 33 MB | 1 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Elaros](https://appshunter.io/developer/1544802505) | [Q_PERIOR AG](https://appshunter.io/developer/532082988) |

## What reviewers say

### C19

[App page](https://appshunter.io/ios/app/c19-yrs/id1558489041)

This NHS-approved application allows clinical teams and universities to manage patient conditions remotely, conduct research, and access support resources. Public-facing versions offer optional subscription services for enhanced features.

**Highlights:** Remote condition management, Clinical service integration, University research participation, Public-facing applications, Optional subscription services, Health and wellbeing resources

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MEA-CAT Self Reporting | $2.99 | per month |
| C19-YRS Self Reporting | $2.99 | per month |
| Self-Reporting Subscription | $2.99 | per year |
| MEA-CAT Self Reporting | $19.99 | per year |
| C19-YRS Self Reporting | $19.99 | per year |


### Pacing

[App page](https://appshunter.io/ios/app/pacing/id6448513970)

This app helps individuals with ME/CFS manage their activity levels by monitoring heart rate against personalized thresholds. It provides visual cues and alerts to prevent overexertion and potential relapses, integrating with Apple Health for comprehensive tracking.

**Highlights:** Activity management for ME/CFS, Personalized heart rate thresholds, Relapse prevention alerts, Visual heart rate zone indicators, Apple Health integration, Apple Watch exclusive

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is C19 free?

C19 is free to download, with in-app purchases available.

### Is Pacing free?

Pacing is free to download, with no in-app purchases.

### Do C19 or Pacing have ads?

Neither C19 nor Pacing shows ads.

### Which is updated more often, C19 or Pacing?

C19 ships an update every 9 days, and Pacing every 4 days. Most recently, C19 was updated on September 18, 2026 and Pacing on September 29, 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.*