# SD401 vs CDR Pro

The clearest difference is update cadence: CDR Pro at monthly against SD401's every 5 months. 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.

SD401 ships an update every 5 months, CDR Pro monthly. The most recent releases landed on October 9, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | SD401 | CDR Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Monthly** |
| Size | 25 MB | 47 MB |
| Requires iOS | **15.5** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Owen Brown](https://appshunter.io/developer/979499266) | [aircargobook GmbH](https://appshunter.io/developer/903808293) |

## What reviewers say

### SD401

[App page](https://appshunter.io/ios/app/sd401/id979499267)

**Features:** macOS Compatibility

**In-app purchases:** none


### CDR Pro

[App page](https://appshunter.io/ios/app/cdr-pro/id1488124338)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SD401 free?

SD401 is free to download, with no in-app purchases.

### Is CDR Pro free?

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

### Do SD401 or CDR Pro have ads?

Neither SD401 nor CDR Pro shows ads.

### Which is updated more often, SD401 or CDR Pro?

SD401 ships an update every 5 months, and CDR Pro monthly. Most recently, SD401 was updated on October 9, 2026 and CDR Pro on October 2, 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.*