# Rail Model Calc vs Trainventory

The clearest difference is ads: Trainventory at none against Rail Model Calc's shown. Trainventory also leads on update cadence (every 4 months vs every 14 months). Rail Model 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.

Rail Model Calc ships an update every 14 months, Trainventory every 4 months. The most recent releases landed on September 13, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Rail Model Calc | Trainventory |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (20 ratings)](https://appshunter.io/ios/app/trainventory/id6738597502/reviews)** |
| Number of ratings | — | **20** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 14 months | **Every 4 months** |
| Monetization | — | Free |
| Size | 13 MB | 29 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 Calc

[App page](https://appshunter.io/ios/app/rail-model-calc/id6474500872)

**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 Calc free?

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

### Is Trainventory free?

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

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

Rail Model Calc shows ads; Trainventory does not.

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

Rail Model Calc ships an update every 14 months, and Trainventory every 4 months. Most recently, Rail Model Calc was updated on September 13, 2026 and Trainventory 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.*