PerformanceTest Mobile vs Diskio
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PerformanceTest Mobile
Objectively benchmark your mobile device's speed and performance with a suite of tests. Analyze CPU, disk, memory, and graphics capabilities to ensure your device is performing optimally. Track results online and make informed purchasing decisions.
- CPU speed tests
- Disk read/write tests
- Memory speed tests
- 2D graphics rendering
- 3D graphics rendering
- Online result tracking
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PassMark Software, the leader in PC benchmarks, now brings you benchmarks for mobile devices. Fast, easy to use, mobile device speed testing and benchmarking. PassMark PerformanceTest™ Mobile allows you to objectively benchmark a mobile device using a variety of different speed tests. *Find out if your device is performing at its best. *View past results online at http://www.iphonebenchmark.net. *Measure the effect of configuration changes and upgrades. *Make objective independent measurements on which to base your purchasing decision. Seventeen standard benchmark tests are available in five test suites! Test Suites: *CPU Tests - Mathematical operations, compression, encryption and more *Disk Tests - Reading and writing files to internal storage *Memory Tests - Read and Write tests *2D Graphics Tests - Simple & Complex Vectors and image rendering and filters tests *3D Graphics Tests - Simple bouncing ball test, a more complex scenes, and a Space Battle Test using Unity.
Diskio
This utility app provides precise speed tests for all your storage devices, from internal iPhone storage to external USB drives. Customize test parameters for detailed insights and identify performance bottlenecks. It offers a simple three-step process to analyze your storage's true capabilities.
- Precise disk speed testing
- Tests internal and external storage
- Customizable test parameters
- Simple three-step process
- Universally compatible with iOS devices
- Identifies performance bottlenecks
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How fast is your storage? Measure sequential read and write speeds on your iPhone or a compatible external drive. Go beyond one number with repeat runs and a detailed report. SEE THE WHOLE RESULT Choose 1, 3 or 6 runs. With 3 or 6 runs, see median read and write speeds, minimum and maximum values, and the result of every run. CHECK CONSISTENCY Choose 6 runs to assess read and write stability separately over the last five. See whether results are stable or vary, with the criteria explained in the app. TEST YOUR SETUP Use your iPhone's internal storage or select a compatible, writable external drive through Files. Choose a test file from 1 to 5 GiB and a block size of 1, 2, 4, 8 or 16 MiB. The defaults are 6 runs, a 1 GiB file and a 2 MiB block. UNDERSTAND THE MEASUREMENT Speeds are shown in MB/s, and write timing includes final filesystem synchronization. Follow each write and read phase as the test runs. SHARE THE DETAILS Send a result card with the full report, test settings and, after 6 runs, the stability assessment. The interface supports light and dark appearances, larger text and Reduce Motion. ADAPTS TO YOUR DISPLAY On iPhone Duo, an expanded layout gives controls and results their own space. Your report stays available as the layout changes, and narrow windows use a compact view. GET STARTED 1. Select your storage and test settings. 2. Start the test and keep Diskio open. 3. Review the report or share your results. A test needs enough free space for a temporary file. External storage must be accessible and writable through Files. Results depend on the device, storage, connection, free space and test settings. The stability assessment adapts numerical criteria from SNIA SSS PTS. It is not a full SNIA-compliant benchmark, a drive-health check or a sustained-performance rating. Results from version 3.0 onward may differ from older versions because the measurement method was revised.
Screenshots
Verdict
The clearest difference is price: PerformanceTest Mobile at Free against Diskio's $5.99. PerformanceTest Mobile also leads on ads (none vs shown) and review sentiment (53% vs 44%). Diskio's advantage is rating (3.9 vs 3.3) and update cadence (weekly vs every 6 weeks). On in-app purchases 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
PerformanceTest Mobile is free to download; Diskio costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Diskio holds the better App Store score, 3.9 against 3.3. Both are backed by a comparable volume of ratings — 56 and 17 respectively. Written reviews complicate that: 53% of PerformanceTest Mobile's written reviews are positive against 44% of Diskio's, so the app with the better star average is not the one people write more warmly about.
PerformanceTest Mobile ships an update every 6 weeks, Diskio weekly. The most recent releases landed on October 6, 2026 and October 21, 2026 respectively.
| Parameter | PerformanceTest Mobile | Diskio |
|---|---|---|
| Price | Free — better | $5.99 |
| Rating | 3.3 (56 ratings) | 3.9 (17 ratings) — better |
| Positive reviews | 52.8% of reviews — better | 44.4% of reviews |
| Number of ratings | 56 — better | 17 |
| Update frequency | Every 6 weeks | Weekly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 11.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 88 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | PassMark Software Inc | Sergii Khliustin |
Customer experience
PerformanceTest Mobile
Diskio
Bugs and requests
PerformanceTest Mobile
Reported bugs
25 issues- Crashes after graphics tests on iOS 18
- Auto-rotate orientation bug after benchmark
- Phone model reported incorrectly
- Tests not strenuous enough (limited 60FPS)
- App crashes on iOS 15.5
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- App crashes on A12 devices
- Benchmark does not continue on graphics tests with older iOS versions
- App crashes on iOS 7.1.2
- App crashes during 2D SIMPLE testing
- App crashes during 2D testing on iPhone 12 mini
- App crashes on iPhone 11
- App crashes on iPhone XS with iOS 13.4.1
- App freezes at the start of the “Memory” suite
- App crashes at the 2D complex vectors test
- App crashes on iPhone XR
- App force quits during graphics test
- App crashes on launch on iPhone 7 (iOS 13.3)
- App crashes on launch on iPhone 6s Plus
- Crashes on the last test, clearing results
- Submit results error on multiple iOS devices
- 2D and 3D tests are choppy on new iPad pros
- Graphic 3D test limited to 60FPS and doesn't fluctuate
- Memory read test shows blank or wildly different numbers
- Inconsistencies in online vs. phone results (Memory Read missing, CPU/Memory off)
- 2D transparent vector test gives highly variable results
Requested features
9 requests- Update for newer iOS versions and devices
- Fix auto-rotate orientation bug
- Add more tests (like Android counterpart)
- Add comparison list/option to compare with common devices
- Add option to compare personal previous tests
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- Update UI and design
- Support for larger screens and 64-bit processors
- Add dark mode option
- Add advanced analytics dashboard
Diskio
Not enough reviews yet to summarise bugs or requests.
In-app purchases
PerformanceTest Mobile
No in-app purchases
Diskio
No in-app purchases
Questions
Is PerformanceTest Mobile free?
Is Diskio free?
Which has better reviews, PerformanceTest Mobile or Diskio?
Do PerformanceTest Mobile or Diskio have ads?
Which is updated more often, PerformanceTest Mobile or Diskio?
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