# Model Inventory vs Rail Model Track Calc

The clearest difference is rating: Model Inventory at 3.1 against Rail Model Track Calc's 1.0. Model Inventory also leads on ads (none vs shown) and update cadence (every 4 weeks vs every 18 months). 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 holds the better App Store score, 3.1 against 1.0. Both are backed by a comparable volume of ratings — 9 and 2 respectively. Written reviews point the same way: 24% of Model Inventory's written reviews are positive against 0% of Rail Model Track Calc's.

Model Inventory ships an update every 4 weeks, Rail Model Track Calc every 18 months. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Model Inventory | Rail Model Track Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (9 ratings)](https://appshunter.io/ios/app/model-inventory/id669218378/reviews)** | [1.0 (2 ratings)](https://appshunter.io/ios/app/rail-model-track-calc/id1529070758/reviews) |
| Number of ratings | **9** | 2 |
| Positive reviews | **24.4% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 4 weeks** | Every 18 months |
| Monetization | **Free** | Ad-supported |
| Size | 10 MB | 9 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 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


## Frequently asked questions

### Is Model Inventory free?

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

### Is Rail Model Track Calc free?

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

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

Model Inventory is rated higher. Model Inventory averages 3.1 out of 5 from 9 ratings, while Rail Model Track Calc averages 1.0 from 2 ratings.

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

Rail Model Track Calc shows ads; Model Inventory does not.

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

Model Inventory ships an update every 4 weeks, and Rail Model Track Calc every 18 months. Most recently, Model Inventory was updated on October 20, 2026 and Rail Model Track Calc 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.*