Freedom251 › Disk Benchmark Software
AmorphousDiskMark
What AmorphousDiskMark is
AmorphousDiskMark is a free, open-source macOS app for measuring storage read and write performance. It reports results in MB/s or IOPS, with both units available in tooltips. Sequential measurements use 1 MiB blocks; random measurements use 4 KiB blocks, and each supports queue depths from 1 through 1024. You can select random or zero 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. After downloading, an internet connection is not required. The maker warns that repeating measurements may shorten a storage device’s lifespan. The GitHub project uses the MIT license; the App Store privacy listing says the developer indicates it does not collect data, though Apple says it has not verified that information.
Who it suits
It suits Mac users who want to measure storage read/write performance and adjust test parameters. Users should account for the maker’s warning about repeated measurements shortening storage lifespan.
What it does well
- Measures sequential and random read/write performance.
- Reports results in MB/s or IOPS.
- Test sizes range from 16 MiB to 64 GiB.
- Works offline after download.
- Free and open source under MIT license.
What to know first
- Mac only; requires macOS 10.9.5 or later.
- Repeated measurements may shorten storage lifespan.
Limits
The free app is for Mac and requires macOS 10.9.5 or later. Repeated read/write measurements may shorten the storage device’s lifespan.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| AmorphousDiskMark | Mac only · macOS 10.9.5 or later | Free |
As github.com lists them, read 9 Oct 2026. The maker's own page has the final word.
Getting started
- Visit the GitHub project page.
- Download the app for a Mac running macOS 10.9.5 or later.
- Choose random or zero measurement data, test size, and interval.
- Run sequential or random read/write measurements.
- Copy the results as plain text or save a screenshot of the app window.
Verdict
AmorphousDiskMark offers configurable sequential and random storage measurements for Macs. Its main caveat is the potential wear from repeating read/write tests.
Questions
How much does AmorphousDiskMark cost?
The listed plan is free.
Which platforms does it support?
It is for macOS, with macOS 10.9.5 or later listed as the requirement.
Is AmorphousDiskMark open source?
Yes. The maker describes it as free and open source, and the GitHub repository identifies the license as MIT.
What does AmorphousDiskMark measure?
It measures storage read and write performance in MB/s and IOPS using sequential 1 MiB tests and random 4 KiB tests.
Can I use it without an internet connection?
The maker says an internet connection is not needed after the app has been downloaded.
Who makes AmorphousDiskMark?
It is made by Katsura Shareware, which says it was founded in 2004 to create shareware for Macs.
Facts from AmorphousDiskMark's own pages
- License
- The maker describes the app as free and open source. · katsurashareware.com, 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, 9 Oct 2026
- Offline use
- The maker's help page says an internet connection is not needed after the app is downloaded. · katsurashareware.com, 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, 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, 9 Oct 2026
- Purpose
- AmorphousDiskMark measures storage read/write performance in MB/s and IOPS. · katsurashareware.com, 9 Oct 2026
- Random tests
- It measures random sequence 4 KiB block reads and writes at queue depths from 1 through 1024. · katsurashareware.com, 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, 9 Oct 2026
- Result units
- Read and write scores are shown in MB/s or IOPS, with both units available in tooltips. · katsurashareware.com, 9 Oct 2026
- Sequential tests
- It measures sequential 1 MiB block reads and writes at queue depths from 1 through 1024. · katsurashareware.com, 9 Oct 2026
- Source license
- The GitHub repository identifies the project license as MIT. · github.com, 9 Oct 2026
- Storage wear
- The maker warns that repeating read/write measurements may shorten the lifespan of the storage device. · katsurashareware.com, 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, 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, 9 Oct 2026
Where AmorphousDiskMark stands on Freedom251
- Disk Benchmark Software#4 of 29