# C19 vs KiActiv Sync

The clearest difference is in-app purchases: KiActiv Sync at none against C19's 5. KiActiv Sync also leads on iOS requirement (9.0 vs 15.0). C19's advantage is update cadence (every 9 days vs every 9 months). On price, ads and device support there is nothing between them.

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

C19 ships an update every 9 days, KiActiv Sync every 9 months. The most recent releases landed on October 6, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | C19 | KiActiv Sync |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 9 months |
| Monetization | Free with in-app purchases | — |
| Size | 33 MB | 70 MB |
| Requires iOS | 15.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Elaros](https://appshunter.io/developer/1544802505) | [Ki Performance Lifestyle Ltd](https://appshunter.io/developer/1105071460) |

## 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 |


### KiActiv Sync

[App page](https://appshunter.io/ios/app/kiactiv-sync/id1588254661)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is C19 free?

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

### Is KiActiv Sync free?

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

### Do C19 or KiActiv Sync have ads?

Neither C19 nor KiActiv Sync shows ads.

### Which is updated more often, C19 or KiActiv Sync?

C19 ships an update every 9 days, and KiActiv Sync every 9 months. Most recently, C19 was updated on October 6, 2026 and KiActiv Sync on October 10, 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.*