# Smart iMeters vs RailControl Unit

The clearest difference is in-app purchases: Smart iMeters at none against RailControl Unit's 1. Smart iMeters also leads on iOS requirement (15.0 vs 18.5). On price, ads and device support there is nothing between them.

Both are free to download. RailControl Unit sells 1 one-off in-app purchase. Smart iMeters asks for nothing beyond the download.

## The numbers

| Metric | Smart iMeters | RailControl Unit |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 20 months | — |
| Size | 29 MB | 5 MB |
| Requires iOS | **15.0** | 18.5 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Changzhou Haoyi Technology Co.,Ltd.](https://appshunter.io/developer/6775329697) | [Boterham](https://appshunter.io/developer/552486731) |

## What reviewers say

### Smart iMeters

[App page](https://appshunter.io/ios/app/smart-imeters/id6450159159)

**Features:** macOS Compatibility

**In-app purchases:** none


### RailControl Unit

[App page](https://appshunter.io/ios/app/railcontrol-unit/id6755979312)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Modules | $2.99 | one-time |


## Frequently asked questions

### Is Smart iMeters free?

Smart iMeters is free to download, with no in-app purchases.

### Is RailControl Unit free?

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

### Do Smart iMeters or RailControl Unit have ads?

Neither Smart iMeters nor RailControl Unit shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*