# Hydro CM vs Rotating Equipment Selector

The clearest difference is rating: Rotating Equipment Selector at 5.0 against Hydro CM's 4.0. Rotating Equipment Selector also leads on ratings volume (5 vs 1). Hydro CM's advantage is update cadence (every 4 days vs every 19 months). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Rotating Equipment Selector holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: Rotating Equipment Selector has 5 ratings behind it against 1, so its average is the more settled of the two.

Hydro CM ships an update every 4 days, Rotating Equipment Selector every 19 months. The most recent releases landed on October 14, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Hydro CM | Rotating Equipment Selector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/hydro-cm/id1132190359/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/rotating-equipment-selector/id1539380211/reviews)** |
| Number of ratings | 1 | **5** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 19 months |
| Monetization | Free | Free |
| Size | 361 MB | 37 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bloc Digital](https://appshunter.io/developer/873078731) | [Siemens Energy](https://appshunter.io/developer/1539380213) |

## 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


### Rotating Equipment Selector

[App page](https://appshunter.io/ios/app/rotating-equipment-selector/id1539380211)

This application assists in selecting centrifugal and reciprocating compressors, gas turbines, and motors. It provides a streamlined process for choosing the right equipment from a leading manufacturer.

**Highlights:** Compressor selection, Gas turbine selection, Motor selection, Equipment specification, Product catalog

**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 Rotating Equipment Selector free?

Rotating Equipment Selector is free to download, with no in-app purchases.

### Which has better reviews, Hydro CM or Rotating Equipment Selector?

Rotating Equipment Selector is rated higher. Hydro CM averages 4.0 out of 5 from 1 ratings, while Rotating Equipment Selector averages 5.0 from 5 ratings.

### Do Hydro CM or Rotating Equipment Selector have ads?

Neither Hydro CM nor Rotating Equipment Selector shows ads.

### Which is updated more often, Hydro CM or Rotating Equipment Selector?

Hydro CM ships an update every 4 days, and Rotating Equipment Selector every 19 months. Most recently, Hydro CM was updated on October 14, 2026 and Rotating Equipment Selector on October 13, 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.*