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HDDScan vs smartmontools: catalog facts
HDDScan	smartmontools
Free Freeware with no paid edition.	Free Free and open source under the GNU GPL version 2.
Windows	Windows, macOS, Linux, Command line
Surface tests in read, verify and erase modes Shows SMART attributes and drive temperature	Often gives advance warning of disk degradation before data is lost smartd monitors on a schedule and notifies you, rather than waiting to be asked
Windows only RAID volumes and USB flash drives get surface tests only	Command-line only; interpreting the attribute values takes some learning Attribute meanings vary by manufacturer and are not always documented
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 21, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.