# Mobile Master vs RDevice Viewer

The clearest difference is review sentiment: Mobile Master at 72% against RDevice Viewer's 0%. Mobile Master also leads on update cadence (every 6 days vs every 2 months) and ratings volume (1.2K vs 15). RDevice Viewer's advantage is in-app purchases (none vs 3) and iOS requirement (13.0 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. Mobile Master sells 3 in-app purchases, starting at $0.49 per month. RDevice Viewer asks for nothing beyond the download.

Mobile Master holds the better App Store score, 4.5 against 4.3. That said, the two scores are not equally well evidenced: Mobile Master has 1.2K ratings behind it against 15, so its average is the more settled of the two. Written reviews point the same way: 72% of Mobile Master's written reviews are positive against 0% of RDevice Viewer's.

Mobile Master ships an update every 6 days, RDevice Viewer every 2 months. The most recent releases landed on October 8, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Mobile Master | RDevice Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (1.2K ratings)](https://appshunter.io/ios/app/mobile-master-cpu-master/id1329937809/reviews)** | [4.3 (15 ratings)](https://appshunter.io/ios/app/rdevice-viewer-clean-storage/id1450504057/reviews) |
| Number of ratings | **1.2K** | 15 |
| Positive reviews | **72.3% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 6 days** | Every 2 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 22 MB | 57 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [东海 刘](https://appshunter.io/developer/1329937808) | [美凤 吴](https://appshunter.io/developer/1512090713) |

## What reviewers say

### Mobile Master

[App page](https://appshunter.io/ios/app/mobile-master-cpu-master/id1329937809)

This free utility app provides detailed information about your device's hardware and software. It measures real CPU frequency, frequency reduction, and offers insights into your screen, battery, network, GPU, RAM, and sensors.

**Highlights:** Measure real CPU frequency, Monitor frequency reduction, View CPU, GPU, and RAM details, Check network speed and IP, Display battery design capacity, Access sensor data

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $0.49 | per month |
| Pro Annual | $2.99 | per year |
| Remove ads | $1.99 | one-time |


### RDevice Viewer

[App page](https://appshunter.io/ios/app/rdevice-viewer-clean-storage/id1450504057)

This utility app helps you free up storage space by intelligently identifying and cleaning duplicate photos, screenshots, large files, and videos. It also provides detailed information about your device's hardware, battery, and network usage.

**Highlights:** Intelligent duplicate photo cleaning, Screenshot and burst photo cleanup, Large file and video removal, Photo and video compression, Device hardware information, Battery status monitoring, Network speed and traffic monitoring

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mobile Master free?

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

### Is RDevice Viewer free?

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

### Which has better reviews, Mobile Master or RDevice Viewer?

Mobile Master is rated higher. Mobile Master averages 4.5 out of 5 from 1.2K ratings, while RDevice Viewer averages 4.3 from 15 ratings.

### Do Mobile Master or RDevice Viewer have ads?

Both Mobile Master and RDevice Viewer show ads.

### Which is updated more often, Mobile Master or RDevice Viewer?

Mobile Master ships an update every 6 days, and RDevice Viewer every 2 months. Most recently, Mobile Master was updated on October 8, 2026 and RDevice Viewer on October 9, 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.*