# Cortrium C3 vs VELLAP SCAN

The clearest difference is update cadence: VELLAP SCAN at every 3 weeks against Cortrium C3's every 11 months. Cortrium C3's advantage is iOS requirement (12.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Cortrium C3 ships an update every 11 months, VELLAP SCAN every 3 weeks. The most recent releases landed on September 27, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Cortrium C3 | VELLAP SCAN |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 3 weeks** |
| Size | 24 MB | 162 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Cortrium ApS](https://appshunter.io/developer/909412468) | [VELLAP Diagnostics GmbH](https://appshunter.io/developer/1715547198) |

## What reviewers say

### Cortrium C3

[App page](https://appshunter.io/ios/app/cortrium-c3/id1480354424)

**Features:** macOS Compatibility

**In-app purchases:** none


### VELLAP SCAN

[App page](https://appshunter.io/ios/app/vellap-scan/id6471528485)

**In-app purchases:** none


## Frequently asked questions

### Is Cortrium C3 free?

Cortrium C3 is free to download, with no in-app purchases.

### Is VELLAP SCAN free?

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

### Do Cortrium C3 or VELLAP SCAN have ads?

Neither Cortrium C3 nor VELLAP SCAN shows ads.

### Which is updated more often, Cortrium C3 or VELLAP SCAN?

Cortrium C3 ships an update every 11 months, and VELLAP SCAN every 3 weeks. Most recently, Cortrium C3 was updated on September 27, 2026 and VELLAP SCAN 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.*