# Rail Model Track Calc vs Trainventory

The clearest difference is review sentiment: Trainventory at 100% against Rail Model Track Calc's 0%. Trainventory also leads on rating (4.6 vs 1.0) and ads (none vs shown). Rail Model Track Calc's advantage is iOS requirement (15.4 vs 18.6). On price, 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.

Trainventory holds the better App Store score, 4.6 against 1.0. That said, the two scores are not equally well evidenced: Trainventory has 27 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 0% of Rail Model Track Calc's written reviews are positive against 100% of Trainventory's.

Rail Model Track Calc ships an update every 18 months, Trainventory every 3 months. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Rail Model Track Calc | Trainventory |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (2 ratings)](https://appshunter.io/ios/app/rail-model-track-calc/id1529070758/reviews) | **[4.6 (27 ratings)](https://appshunter.io/ios/app/trainventory/id6738597502/reviews)** |
| Number of ratings | 2 | **27** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 18 months | **Every 3 months** |
| Monetization | Ad-supported | **Free** |
| Size | 9 MB | 30 MB |
| Requires iOS | **15.4** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nobuyuki Kumakura](https://appshunter.io/developer/1529070760) | [Nicholas Eby](https://appshunter.io/developer/380053295) |

## 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


### Trainventory

[App page](https://appshunter.io/ios/app/trainventory/id6738597502)

Organize, track the value of, and create wishlists for your model train collection. Get reminders for new releases and manage your hobby efficiently.

**Highlights:** Organize train collection, Track costs and value, Create wishlists, Wishlist reminders, User-friendly design

**In-app purchases:** none


## Frequently asked questions

### Is Rail Model Track Calc free?

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

### Is Trainventory free?

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

### Which has better reviews, Rail Model Track Calc or Trainventory?

Trainventory is rated higher. Rail Model Track Calc averages 1.0 out of 5 from 2 ratings, while Trainventory averages 4.6 from 27 ratings.

### Do Rail Model Track Calc or Trainventory have ads?

Rail Model Track Calc shows ads; Trainventory does not.

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

Rail Model Track Calc ships an update every 18 months, and Trainventory every 3 months. Most recently, Rail Model Track Calc was updated on October 24, 2026 and Trainventory on October 27, 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.*