# SKF TraX vs Kingpin KP400A Control System

The clearest difference is update cadence: SKF TraX at every 2 months against Kingpin KP400A Control System's every 26 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.

SKF TraX ships an update every 2 months, Kingpin KP400A Control System every 26 months. The most recent releases landed on March 4, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | SKF TraX | Kingpin KP400A Control System |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 26 months |
| Size | 18 MB | 22 MB |
| Requires iOS | 15.4 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [SKF](https://appshunter.io/developer/472922971) | [Kingpin Screens](https://appshunter.io/developer/1754549644) |

## What reviewers say

### SKF TraX

[App page](https://appshunter.io/ios/app/skf-trax/id1566086375)

**In-app purchases:** none


### Kingpin KP400A Control System

[App page](https://appshunter.io/ios/app/kingpin-kp400a-control-system/id6504996688)

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

**In-app purchases:** none


## Frequently asked questions

### Is SKF TraX free?

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

### Is Kingpin KP400A Control System free?

Kingpin KP400A Control System is free to download, with no in-app purchases.

### Do SKF TraX or Kingpin KP400A Control System have ads?

Neither SKF TraX nor Kingpin KP400A Control System shows ads.

### Which is updated more often, SKF TraX or Kingpin KP400A Control System?

SKF TraX ships an update every 2 months, and Kingpin KP400A Control System every 26 months. Most recently, SKF TraX was updated on March 4, 2026 and Kingpin KP400A Control System on September 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.*