Freedom251 › PC Benchmark Software
AmorphousDiskMark
What AmorphousDiskMark is
AmorphousDiskMark is a free, open-source macOS utility for measuring storage read and write performance in MB/s or IOPS. It runs sequential tests with 1 MiB blocks and random tests with 4 KiB blocks, using queue depths from 1 to 1024. You can select random or zero test data, measurement sizes from 16 MiB to 64 GiB, and intervals from 0 seconds to 10 minutes. Results can be shown in MB/s or IOPS, copied as plain text, or saved as a screenshot. Custom test profiles are supported, and the app works without an internet connection after download. The maker lists macOS 10.9.5 or later as required and links to the source repository. The developer reports no data collection, while Apple says that information has not been verified. Repeated measurements may shorten storage-device lifespan. The listed Free plan costs nothing and is Mac only.
Who it suits
AmorphousDiskMark suits Mac users who need configurable sequential and random storage benchmarks. It is also useful for people wanting an open-source tool with offline operation.
What it does well
- Measures sequential and random storage performance
- Reports MB/s or IOPS
- Supports custom test profiles
- Works offline after download
- Free and open source
What to know first
- Mac only
- Repeated tests may reduce storage lifespan
- Apple has not verified the privacy disclosure
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| AmorphousDiskMark | Disk read/write benchmarking | On request |
| Free | Free app · Mac only | Free |
As katsurashareware.com lists them, read 24 Sept 2026. The maker's own page has the final word.
Verdict
AmorphousDiskMark offers detailed, configurable storage benchmarks at no listed cost. Its Mac-only scope and the possible wear from repeated measurements are the main considerations.
Facts from AmorphousDiskMark's own pages
- Benchmark caution
- The maker cautions that repeated read/write measurements may shorten the lifespan of the storage device. · katsurashareware.com, 11 Oct 2026
- Compatibility
- The maker lists macOS 10.9.5 or later as the operating system requirement. · katsurashareware.com, 11 Oct 2026
- Distribution
- The maker describes the app as free and open source and links to its source repository. · katsurashareware.com, 11 Oct 2026
- Free plan
- No · katsurashareware.com, 24 Sept 2026
- Interface
- The maker says it received permission from the author of CrystalDiskMark to use an identical or similar interface. · katsurashareware.com, 11 Oct 2026
- Maker history
- Katsura Shareware says it was founded in 2004 and describes its mission as creating shareware that makes Macs more useful and fun to use. · katsurashareware.com, 11 Oct 2026
- Offline use
- The maker’s help page says an app does not need an internet connection after it is downloaded. · katsurashareware.com, 11 Oct 2026
- Operating systems
- macOS · katsurashareware.com, 24 Sept 2026
- Privacy
- Apple’s listing says the developer reports that the app does not collect data; Apple says this information has not been verified by Apple. · apps.apple.com, 11 Oct 2026
- Purpose
- AmorphousDiskMark measures storage read/write performance in MB/s and IOPS. · katsurashareware.com, 11 Oct 2026
- Random tests
- It measures random 4 KiB block reads and writes at queue depths from 1 to 1024. · katsurashareware.com, 11 Oct 2026
- Results
- Read/write results can be displayed in MB/s or IOPS, and measurements can be copied as plain text or saved in a screenshot. · katsurashareware.com, 11 Oct 2026
- Sequential tests
- It measures sequential 1 MiB block reads and writes at queue depths from 1 to 1024. · katsurashareware.com, 11 Oct 2026
- Support
- The maker lists [email protected] as a contact address and directs users to its forum for tips and usage examples. · katsurashareware.com, 11 Oct 2026
- Test options
- Users can choose random or zero test data, measurement sizes from 16 MiB to 64 GiB, and intervals from 0 seconds to 10 minutes. · katsurashareware.com, 11 Oct 2026
- Workload areas
- Sequential read/write; random read/write · katsurashareware.com, 24 Sept 2026
Where AmorphousDiskMark stands on Freedom251
- PC Benchmark Software#14 of 73
- PC benchmark tools#61 of 70