# Rail Model Calc vs CloudClear

The clearest difference is in-app purchases: Rail Model Calc at none against CloudClear's 2. Rail Model Calc also leads on iOS requirement (15.4 vs 17.0). CloudClear's advantage is ads (none vs shown) and update cadence (fortnightly vs every 14 months). On price and device support there is nothing between them.

Both are free to download. CloudClear sells 2 in-app purchases, starting at $4.99 per month. Rail Model Calc asks for nothing beyond the download.

Rail Model Calc ships an update every 14 months, CloudClear fortnightly. Both last shipped on November 4, 2026.

## The numbers

| Metric | Rail Model Calc | CloudClear |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 14 months | **Fortnightly** |
| Size | 13 MB | 1 MB |
| Requires iOS | **15.4** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nobuyuki Kumakura](https://appshunter.io/developer/1529070760) | [Dana Sima](https://appshunter.io/developer/1724090003) |

## What reviewers say

### Rail Model Calc

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

**Features:** macOS Compatibility

**In-app purchases:** none


### CloudClear

[App page](https://appshunter.io/ios/app/cloudclear/id6475635312)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cloud Clear Pro Monthly | $4.99 | per month |
| Cloud Clear Pro Yearly | $49.99 | per year |


## Frequently asked questions

### Is Rail Model Calc free?

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

### Is CloudClear free?

CloudClear is free to download, with in-app purchases available.

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

Rail Model Calc shows ads; CloudClear does not.

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

Rail Model Calc ships an update every 14 months, and CloudClear fortnightly. Most recently, Rail Model Calc was updated on November 4, 2026 and CloudClear on November 4, 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.*