# RailRes vs PrimalThenics Studio

The clearest difference is update cadence: RailRes at monthly against PrimalThenics Studio's every 4 months. RailRes also leads on iOS requirement (9.0 vs 15.1). 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.

RailRes ships an update monthly, PrimalThenics Studio every 4 months. The most recent releases landed on October 5, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | RailRes | PrimalThenics Studio |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 4 months |
| Size | 49 MB | 70 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [TrackSAFE Foundation Limited](https://appshunter.io/developer/1100518506) | [Xoda Pty Ltd](https://appshunter.io/developer/1662306656) |

## What reviewers say

### RailRes

[App page](https://appshunter.io/ios/app/railres/id1100518507)

**Features:** macOS Compatibility

**In-app purchases:** none


### PrimalThenics Studio

[App page](https://appshunter.io/ios/app/primalthenics-studio/id6471898084)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RailRes free?

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

### Is PrimalThenics Studio free?

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

### Do RailRes or PrimalThenics Studio have ads?

Neither RailRes nor PrimalThenics Studio shows ads.

### Which is updated more often, RailRes or PrimalThenics Studio?

RailRes ships an update monthly, and PrimalThenics Studio every 4 months. Most recently, RailRes was updated on October 5, 2026 and PrimalThenics Studio on October 6, 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.*