# Model Inventory vs Rail Model Calc

The clearest difference is ads: Model Inventory at none against Rail Model Calc's shown. Model Inventory also leads on update cadence (every 4 weeks vs every 14 months) and iOS requirement (9.0 vs 15.4). 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.

Model Inventory ships an update every 4 weeks, Rail Model Calc every 14 months. The most recent releases landed on October 20, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Model Inventory | Rail Model Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (9 ratings)](https://appshunter.io/ios/app/model-inventory/id669218378/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 24.4% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 4 weeks** | Every 14 months |
| Monetization | Free | — |
| Size | 10 MB | 13 MB |
| Requires iOS | **9.0** | 15.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Woodland Scenics](https://appshunter.io/developer/528641487) | [Nobuyuki Kumakura](https://appshunter.io/developer/1529070760) |

## What reviewers say

### Model Inventory

[App page](https://appshunter.io/ios/app/model-inventory/id669218378)

This app helps model railroad enthusiasts organize their collections. Track locomotives, rolling stock, structures, and accessories with custom categories, purchase details, photos, and notes. It's ideal for managing your collection and for use at train shows.

**Highlights:** Track locomotives, rolling stock, structures, scenery, accessories, Create custom categories, Log purchase date and cost, Store photos, Add notes, Useful for train shows and swap meets

**Features:** macOS Compatibility

**In-app purchases:** none


### Rail Model Calc

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Model Inventory free?

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

### Is Rail Model Calc free?

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

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

Rail Model Calc shows ads; Model Inventory does not.

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

Model Inventory ships an update every 4 weeks, and Rail Model Calc every 14 months. Most recently, Model Inventory was updated on October 20, 2026 and Rail Model Calc on October 1, 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.*