# Rail Model Track Calc vs Starlight Clock

The clearest difference is in-app purchases: Rail Model Track Calc at none against Starlight Clock's 1. Starlight Clock's advantage is update cadence (every 3 months vs every 18 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Starlight Clock sells 1 one-off in-app purchase. Rail Model Track Calc asks for nothing beyond the download.

Rail Model Track Calc ships an update every 18 months, Starlight Clock every 3 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | Rail Model Track Calc | Starlight Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (2 ratings)](https://appshunter.io/ios/app/rail-model-track-calc/id1529070758/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 18 months | **Every 3 months** |
| Monetization | Ad-supported | — |
| Size | 9 MB | 14 MB |
| Requires iOS | 15.4 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nobuyuki Kumakura](https://appshunter.io/developer/1529070760) | [Mihoko Araki](https://appshunter.io/developer/1476136915) |

## What reviewers say

### Rail Model Track Calc

[App page](https://appshunter.io/ios/app/rail-model-track-calc/id1529070758)

Easily calculate horizontal and vertical dimensions for diagonal railroad model track layouts. Input track length and angle to get precise measurements for combining different track pieces. Avoid guesswork and ensure accurate model railway construction.

**Highlights:** Calculate horizontal and vertical track lengths, Input track length and angle, Precise measurements in 0.5 mm increments, Error margin less than 0.5mm, Reset function for calculations, Designed for railroad modeling hobbyists

**Features:** macOS Compatibility

**In-app purchases:** none


### Starlight Clock

[App page](https://appshunter.io/ios/app/starlight-clock/id6470951164)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Starlight Clock with no ads | $2.99 | one-time |


## Frequently asked questions

### Is Rail Model Track Calc free?

Rail Model Track Calc is free to download, with no in-app purchases.

### Is Starlight Clock free?

Starlight Clock is free to download, with in-app purchases available.

### Do Rail Model Track Calc or Starlight Clock have ads?

Both Rail Model Track Calc and Starlight Clock show ads.

### Which is updated more often, Rail Model Track Calc or Starlight Clock?

Rail Model Track Calc ships an update every 18 months, and Starlight Clock every 3 months. Most recently, Rail Model Track Calc was updated on October 24, 2026 and Starlight Clock on October 24, 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.*