# CP vs RTB BLX

The clearest difference is iOS requirement: CP at 12.0 against RTB BLX's 16.6. On price, update cadence, ads and in-app purchases there is nothing between them.

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

CP ships an update every 6 months, RTB BLX every 7 months. The most recent releases landed on October 3, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | CP | RTB BLX |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 7 months |
| Size | 3 MB | 35 MB |
| Requires iOS | **12.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Steffel KKS GmbH](https://appshunter.io/developer/786166712) | [RTB Elektronik](https://appshunter.io/developer/1033533477) |

## What reviewers say

### CP

[App page](https://appshunter.io/ios/app/cp-compact/id1016796623)

**Features:** macOS Compatibility

**In-app purchases:** none


### RTB BLX

[App page](https://appshunter.io/ios/app/rtb-blx/id1524448175)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is CP free?

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

### Is RTB BLX free?

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

### Do CP or RTB BLX have ads?

Neither CP nor RTB BLX shows ads.

### Which is updated more often, CP or RTB BLX?

CP ships an update every 6 months, and RTB BLX every 7 months. Most recently, CP was updated on October 3, 2026 and RTB BLX on October 11, 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.*