# Rail Model Calc vs HoustonTX Alerting

The clearest difference is ads: HoustonTX Alerting at none against Rail Model Calc's shown. HoustonTX Alerting also leads on iOS requirement (12.0 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.

## The numbers

| Metric | Rail Model Calc | HoustonTX Alerting |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 14 months | — |
| Size | 13 MB | 68 MB |
| Requires iOS | 15.4 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nobuyuki Kumakura](https://appshunter.io/developer/1529070760) | [Mach Alert Inc.](https://appshunter.io/developer/1472612618) |

## What reviewers say

### Rail Model Calc

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

**Features:** macOS Compatibility

**In-app purchases:** none


### HoustonTX Alerting

[App page](https://appshunter.io/ios/app/houstontx-alerting/id6743223147)

**Features:** macOS Compatibility

**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 HoustonTX Alerting free?

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

### Do Rail Model Calc or HoustonTX Alerting have ads?

Rail Model Calc shows ads; HoustonTX Alerting does not.

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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.*