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AmorphousDiskMark

github.com

Free plan macOS
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Spec score 7.9 #8 of 29 in Disk Benchmark Software

What it is

AmorphousDiskMark is a free, open-source macOS utility for measuring storage read and write performance. It reports scores in megabytes per second or IOPS, with both units available in result tooltips. Sequential measurements use 1 MiB blocks, while random measurements use 4 KiB blocks; either type can run at queue depths from 1 through 1024. You can select random or zero test data, choose test sizes from 16 MiB to 64 GiB, and set intervals from 0 seconds to 10 minutes. Results can be copied as plain text, and the app can save a screenshot of its window. The product page lists macOS 10.9.5 or later, and the App Store describes it as Mac-only. The maker says an internet connection is unnecessary after downloading. The GitHub repository identifies an MIT license. The listed plan is free. Repeating read/write measurements may shorten storage-device lifespan.

Spec sheet

Purpose
AmorphousDiskMark measures storage read/write performance in MB/s and IOPS.Read 9 Oct 2026 · katsurashareware.com
Privacy
Apple's App Store listing says the developer indicates that the app does not collect data; Apple says this information has not been verified by Apple.Read 9 Oct 2026 · apps.apple.com
Support
The maker lists [email protected] as a contact and directs users to its forum for tips and usage examples.Read 9 Oct 2026 · katsurashareware.com
License
The maker describes the app as free and open source.Read 9 Oct 2026 · katsurashareware.com
Maker
Katsura Shareware says it was founded in 2004 to create shareware that makes Macs more useful and fun to use.Read 9 Oct 2026 · katsurashareware.com
Offline use
The maker's help page says an internet connection is not needed after the app is downloaded.Read 9 Oct 2026 · katsurashareware.com
Platform
The product page lists macOS 10.9.5 or later, and the App Store describes the app as only for Mac.Read 9 Oct 2026 · katsurashareware.com
Random tests
It measures random sequence 4 KiB block reads and writes at queue depths from 1 through 1024.Read 9 Oct 2026 · katsurashareware.com
Result sharing
Measurements can be copied and pasted as plain text, and the app can save a screenshot of its window.Read 9 Oct 2026 · katsurashareware.com
Result units
Read and write scores are shown in MB/s or IOPS, with both units available in tooltips.Read 9 Oct 2026 · katsurashareware.com
Sequential tests
It measures sequential 1 MiB block reads and writes at queue depths from 1 through 1024.Read 9 Oct 2026 · katsurashareware.com
Source license
The GitHub repository identifies the project license as MIT.Read 9 Oct 2026 · github.com
Storage wear
The maker warns that repeating read/write measurements may shorten the lifespan of the storage device.Read 9 Oct 2026 · katsurashareware.com
Test configuration
Users can choose random or zero measurement data, test sizes from 16 MiB to 64 GiB, and intervals from 0 seconds to 10 minutes.Read 9 Oct 2026 · katsurashareware.com

Plans and prices

AmorphousDiskMark Free Mac only · macOS 10.9.5 or later Read 9 Oct 2026 · katsurashareware.com

Every AmorphousDiskMark plan and price →

Strong points and limits

Strong points

  • Measures sequential and random storage performance
  • Reports both MB/s and IOPS
  • Queue depths range from 1 through 1024
  • Test sizes span 16 MiB to 64 GiB
  • Free and MIT-licensed

Limits

  • Available only for macOS
  • Repeated tests may shorten storage lifespan
  • macOS 10.9.5 or later is required

Who it suits

It suits Mac users who need configurable sequential and random storage benchmarks with MB/s and IOPS results. It is also suitable for users wanting a free, open-source tool that works offline after download.

Verdict

AmorphousDiskMark offers detailed storage read/write measurements with adjustable data, sizes, intervals, and queue depths. Its Mac-only availability and warning about repeated writes are the main constraints. The software costs nothing.

Where Specifiction places it

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