# Hydro CM vs Rolls

Hydro CM and Rolls are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

## The numbers

| Metric | Hydro CM | Rolls |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/hydro-cm/id1132190359/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 days | — |
| Monetization | Free | — |
| Size | 361 MB | 35 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bloc Digital](https://appshunter.io/developer/873078731) | [Rolls-Royce Holdings Plc](https://appshunter.io/developer/501951395) |

## What reviewers say

### Hydro CM

[App page](https://appshunter.io/ios/app/hydro-cm/id1132190359)

Explore a 3D augmented reality model of a hydro turbine to understand condition-monitoring solutions. Visualize optimized sensor installations and discover hardware/software that translates data into maintenance actions, protecting your assets and reducing costs.

**Highlights:** Augmented reality turbine visualization, Optimized sensor installation display, Maintenance action insights, Asset protection and optimization, Cost reduction analysis

**Features:** macOS Compatibility

**In-app purchases:** none


### Rolls

[App page](https://appshunter.io/ios/app/rolls-royce-foundation-service/id1480209713)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Hydro CM free?

Hydro CM is free to download, with no in-app purchases.

### Is Rolls free?

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

### Do Hydro CM or Rolls have ads?

Neither Hydro CM nor Rolls shows ads.

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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.*