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HDDScan vs GNU ddrescue: catalog facts
HDDScan	GNU ddrescue
Free Freeware with no paid edition.	Free Free and open source, part of the GNU Project.
Windows	macOS, Linux, Command line
Surface tests in read, verify and erase modes Shows SMART attributes and drive temperature	Handles read errors so as little data as possible is lost Scrapes good sectors out of partially readable blocks
Windows only RAID volumes and USB flash drives get surface tests only	Command-line only, with no graphical interface Copies raw blocks and does not recover individual deleted files
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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