Device Tester vs Mobile Master
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Device Tester
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.
- Real-time RAM usage
- Disk usage monitoring
- CPU usage tracking
- Network activity
- Battery status
- System information
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Device Tester: A simple tool for hardware testing with lightweight diagnostic checks for key components. Key Features: • Hardware Test: → Test Camera, Bluetooth, Audio, Microphone, Keyboard Input, Sensors, and other hardware components. • System Info Tools: → View quick device details including RAM, CPU, storage, network, and battery status. • Utilities: → QR Code Generator → Random Selection Tool → Storage Cleaner → Clipboard Cleaner → Flashlight Torch • Thank you for choosing our app!
Mobile Master
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.
- 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
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Quickly and accurately measure real cpu frequency and frequency reduction Mobile Master is a free tool to provide information about your device - cpu , operating system , memory, GPU, network and battery. - CPU : Processor , real frequency, frequency ratio,frequency reduction, etc. - General : Screen resolution, size, density, etc. - Battery : Desigin capacity. - Network : IP , download/upload speed , etc. - GPU : GPU Type , extentions. - RAM : Total ram , used ram , etc. - Sensors: Acceleration,rotation,magnetic field,pressure and distance Terms of Use：https://m.591master.com/m/uiforum/getpage.html?key=cputerms Privacy Policy：https://m.591master.com/m/uiforum/getpage.html?key=cpuprivacy
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Device Tester | Mobile Master |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (231 ratings) | 4.5 (1.2K ratings) — better |
| Positive reviews | 55.1% of reviews | 72.3% of reviews — better |
| Number of ratings | 231 | 1.2K — better |
| Update frequency | Weekly | Every 6 days — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 8 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Phan Nhut | 东海 刘 |
Customer experience
Device Tester
Mobile Master
Bugs and requests
Device Tester
Reported bugs
8 issues- 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
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- Pro version disappears after app updates
- Push notification spam
- Excessive pop-ups preventing app access
Requested features
8 requests- 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
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- Real-time feedback on device performance
- Comparison tool for different phone models
- Better integration with system settings
Mobile Master
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Device Tester
- Pro Version$1.99
Mobile Master
- Pro Monthly$0.491 Month
- Pro Annual$2.991 Year
- Remove ads$1.99
Questions
Is Device Tester free?
Is Mobile Master free?
Which has better reviews, Device Tester or Mobile Master?
Do Device Tester or Mobile Master have ads?
Which is updated more often, Device Tester or Mobile Master?
Other comparisons
