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AmorphousDiskMark
What it is
AmorphousDiskMark is a free, open-source Mac app for measuring storage read and write performance in MB/s and IOPS. It runs sequential tests with 1 MiB blocks and random tests with 4 KiB blocks; both test types offer queue depths from 1 through 1024. Users can choose random or zero measurement data, select test sizes from 16 MiB to 64 GiB, and set intervals from 0 seconds to 10 minutes. Results display read and write scores in MB/s or IOPS, with both units also available in tooltips. Measurements can be copied as plain text, and the app can save a screenshot of its window. The listed plan costs nothing, and the product page lists macOS 10.9.5 or later. The maker says internet access is not needed after download. Repeating read/write measurements may shorten a storage device’s lifespan. The GitHub repository identifies the project’s license as MIT. Apple’s App Store listing says the developer indicates that the app does not collect data, but Apple notes that this information has not been verified.
For and against
For
- Measures results in both MB/s and IOPS.
- Supports sequential and random I/O tests.
- Test sizes range from 16 MiB to 64 GiB.
- Measurements can be copied as plain text.
Against
- Available only for Mac.
- Repeated measurements may shorten storage lifespan.
- Requires macOS 10.9.5 or later.
The verdict
AmorphousDiskMark offers configurable storage benchmarks and simple ways to keep or share results. Its Mac-only availability and the maker’s storage-wear warning are worth considering before repeated testing.
Who it suits
This app suits Mac users who want to measure storage performance using sequential or random reads and writes. It is also useful for people who need adjustable test sizes and intervals or exportable results.
Plans and prices
AmorphousDiskMark
Mac only · macOS 10.9.5 or later
Read 9 Oct 2026 · katsurashareware.com
On the record
- License
- The maker describes the app as free and open source.katsurashareware.com · read 9 Oct 2026
- Maker
- Katsura Shareware says it was founded in 2004 to create shareware that makes Macs more useful and fun to use.katsurashareware.com · read 9 Oct 2026
- Offline use
- The maker's help page says an internet connection is not needed after the app is downloaded.katsurashareware.com · read 9 Oct 2026
- Platform
- The product page lists macOS 10.9.5 or later, and the App Store describes the app as only for Mac.katsurashareware.com · read 9 Oct 2026
- 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.apps.apple.com · read 9 Oct 2026
- Purpose
- AmorphousDiskMark measures storage read/write performance in MB/s and IOPS.katsurashareware.com · read 9 Oct 2026
- Random tests
- It measures random sequence 4 KiB block reads and writes at queue depths from 1 through 1024.katsurashareware.com · read 9 Oct 2026
- Result sharing
- Measurements can be copied and pasted as plain text, and the app can save a screenshot of its window.katsurashareware.com · read 9 Oct 2026
- Result units
- Read and write scores are shown in MB/s or IOPS, with both units available in tooltips.katsurashareware.com · read 9 Oct 2026
- Sequential tests
- It measures sequential 1 MiB block reads and writes at queue depths from 1 through 1024.katsurashareware.com · read 9 Oct 2026
- Source license
- The GitHub repository identifies the project license as MIT.github.com · read 9 Oct 2026
- Storage wear
- The maker warns that repeating read/write measurements may shorten the lifespan of the storage device.katsurashareware.com · read 9 Oct 2026
- Support
- The maker lists [email protected] as a contact and directs users to its forum for tips and usage examples.katsurashareware.com · read 9 Oct 2026
- 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.katsurashareware.com · read 9 Oct 2026
