# Device Tester vs Mobile Master

The clearest difference is rating: Mobile Master at 4.5 against Device Tester's 4.0. Mobile Master also leads on review sentiment (72% vs 55%) and ratings volume (1.2K vs 231). Device Tester's advantage is ads (none vs shown). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. Device Tester sells 1 one-off in-app purchase and Mobile Master sells 3 in-app purchases, starting at $0.49 per month. Whichever you choose, the download price is not the number that matters.

Mobile Master holds the better App Store score, 4.5 against 4.0. That said, the two scores are not equally well evidenced: Mobile Master has 1.2K ratings behind it against 231, so its average is the more settled of the two. Written reviews point the same way: 55% of Device Tester's written reviews are positive against 72% of Mobile Master's.

Device Tester ships an update weekly, Mobile Master every 6 days. The most recent releases landed on September 21, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Device Tester | Mobile Master |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (231 ratings)](https://appshunter.io/ios/app/device-tester-system-checker/id873671623/reviews) | **[4.5 (1.2K ratings)](https://appshunter.io/ios/app/mobile-master-cpu-master/id1329937809/reviews)** |
| Number of ratings | 231 | **1.2K** |
| Positive reviews | 55.1% of reviews | **72.3% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Weekly | **Every 6 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 8 MB | 47 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Phan Nhut](https://appshunter.io/developer/849063753) | [东海 刘](https://appshunter.io/developer/1329937808) |

## What reviewers say

### Device Tester

[App page](https://appshunter.io/ios/app/device-tester-system-checker/id873671623)

Monitor your device's real-time system information, including RAM, disk, and CPU usage. Track network activity, battery status, and other system details to understand your device's performance.

**Highlights:** Real-time RAM usage, Disk usage monitoring, CPU usage tracking, Network activity, Battery status, System information

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $1.99 | one-time |

**What reviewers like**

- 👍 User-friendly and intuitive design
- 🚀 Effective RAM memory cleaning and freeing
- 💰 Affordable one-time pro version purchase
- 📊 Detailed device analysis and performance monitoring
- ⏱️ Quick and simple to use

**What reviewers complain about**

- 🐛 Frequent app crashes on newer iOS versions
- 📢 Excessive and intrusive advertisements
- ❌ Limited functionality in free version
- 😞 Degraded performance after updates
- 🔄 Inconsistent results and reliability issues

**Reported bugs**

- App crashes during memory scan on newer iOS versions
- Crashes on iPhone 16 and iPhone 17 Pro models
- App fails to open or closes immediately
- Memory cleaning returns 0.0MB results
- Incompatibility with iOS 14 and later versions

**Requested features**

- Landscape view support for device rotation
- Deeper cleaning of junk files and cache
- More transparent proof of app actions and results
- Ability to keep pro version after updates
- Instruction guide on optimal app usage


### 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

**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 |


## Frequently asked questions

### Is Device Tester free?

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

### Is Mobile Master free?

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

### Which has better reviews, Device Tester or Mobile Master?

Mobile Master is rated higher. Device Tester averages 4.0 out of 5 from 231 ratings, while Mobile Master averages 4.5 from 1.2K ratings.

### Do Device Tester or Mobile Master have ads?

Mobile Master shows ads; Device Tester does not.

### Which is updated more often, Device Tester or Mobile Master?

Device Tester ships an update weekly, and Mobile Master every 6 days. Most recently, Device Tester was updated on September 21, 2026 and Mobile Master on September 24, 2026.

---

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