CrystalDiskInfo is not available for Mac but there are a few alternatives that runs on macOS with similar functionality. The best Mac Hard Disk Diagnostic Tool alternative is GSmartControl, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to CrystalDiskInfo and four of them are Hard Disk Diagnostic Tools available for Mac so hopefully you can find a suitable replacement. Other interesting Mac Hard Disk Diagnostic Tool alternatives to CrystalDiskInfo are smartmontools, DriveDx and SMARTReporter.
GSmartControl provides a GUI for smartctl from smartmontools, allowing users to monitor and control SMART data on hard drives. It supports health inspection, runs diagnostic tests, and warns about potential drive failures, ensuring maintenance and optimal disk performance.
The smartmontools package contains two utility programs (smartctl and smartd) to control and monitor storage systems using the Self-Monitoring, Analysis and Reporting Technology System (SMART) built into most modern ATA and SCSI harddisks.
DriveDx is advanced drive health diagnostic and monitoring utility. Unlike most drive utilities, DriveDx does not only monitor the drive’s built-in S.M.A.R.T. status, but also analyzes the changes of all drive health indicators that are closely related to HDD or SSD failures...
SMARTReporter is an application that can warn you of some hard disk drive failures before they actually happen! It does so by periodically polling the built-in S.M.A.R.T. status of your hard disk drives as well as performing other checks for "I/O errors" or R.A.I.
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Works pretty alright, enough for my needs, though there's some values where it will say "pre-failure" for even the values you get out-of-the-box with a new drive, something to be aware of.
To respond to the one negative comment, all drives will show as "unknown device" IF you don't run the program with admin privileges -- even my SATA HDDs and SSDs will display as "unknown device" if I do not have superuser privs.