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Hard Disk Sentinel vs HDDScan: catalog facts
Hard Disk Sentinel	HDDScan
Freemium A limited free version exists. The Professional edition is a paid licence.	Free Freeware with no paid edition.
Windows, Linux	Windows
Health and estimated lifetime per drive rather than raw S.M.A.R.T. values Sees drives behind many USB enclosures and RAID controllers	Surface tests in read, verify and erase modes Shows SMART attributes and drive temperature
The free version is limited; most features need the paid Professional edition	Windows only RAID volumes and USB flash drives get surface tests only
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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