Comparison

Model Inventory vs Rail Model Calc

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Model Inventory

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
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Easy-to-use inventory system for tracking your model railroad locomotives, rolling stock, structures, scenery and accessories. Create custom categories, log item purchase date and cost, store photos, and make notes. Perfect to take to train shows and swap meets.

About

Rail Model Calc

Features
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Overview This is a calculator app that includes calculation functions necessary when playing with railroad model. How to use After launching the app,the first screen that appears is the Home screen, which also serves as a menu. Swipe and tap the menu on the Home screen to transition to various calculation modes. You can use various calculation modes to perform calculations necessary for railway model track length and railway model production. This App offer the following calculation modes. •Home mode Home is available simple calculations. Set F1-F10 memory on this screen. •Normal mode It is a normal calculator. •Straight mode This mode calculates horizontal and vertical lengths when laying a straight rail diagonally. •Curve mode This mode calculates the vertical, horizontal, and diagonal lengths when laying a curve rail. •S-Curve mode This mode calculates the vertical, horizontal, and diagonal lengths when laying a s-curve rail. •Scale X/Y mode This mode calculates the scale. •Inch to MM mode This mode converts yards and inches to millimeters. For details on how to use it, there is a manual on "?" button. Disclaimer This calculator is for the railroad modeling hobby. The calculation results is the numerical value which be calculated by the developer. It may be different from the numerical value by model manufacturer. In particular, commercially available railroad model rails allow for dimensional errors. Therefore, the calculation results do not necessarily represent what the track layout cannot or can be done. This application is subject to change without notice. The developer assumes no responsibility for any loss or claims by third parties which may arise from the use of this application.

Screenshots

Model Inventory4 screens
Rail Model Calc4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
Model Inventory versus Rail Model Calc: the parameters behind the verdict, then further details
ParameterModel InventoryRail Model Calc
PriceFreeFree
Rating3.1 (9 ratings) — better—
Positive reviews24.4% of reviews—
Number of ratings9 — better—
Update frequencyEvery 4 weeks — betterEvery 14 months
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better15.4
Further details — not scored
Size10 MB13 MB
Age rating4+4+
DeveloperWoodland ScenicsNobuyuki Kumakura

In-app purchases

None

Model Inventory

No in-app purchases

None

Rail Model Calc

No in-app purchases

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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