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HD Tune vs Hard Disk Sentinel: catalog facts
HD Tune	Hard Disk Sentinel
Freemium A free version is available. HD Tune Pro is a paid licence.	Freemium A limited free version exists. The Professional edition is a paid licence.
Windows	Windows, Linux
Transfer-rate graph across the whole drive shows slow regions clearly	Health and estimated lifetime per drive rather than raw S.M.A.R.T. values Sees drives behind many USB enclosures and RAID controllers
The free version is old and only the Pro version is still updated Windows only	The free version is limited; most features need the paid Professional edition
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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