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SeaTools vs smartmontools: catalog facts
SeaTools	smartmontools
Free Free download from Seagate.	Free Free and open source under the GNU GPL version 2.
Windows	Windows, macOS, Linux, Command line
Official diagnostic tool from a drive manufacturer Quick health check for hard drives and SSDs	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
Aimed mainly at Seagate drives Offers diagnostics rather than repair or recovery	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: Proprietary	License: GPL-2.0
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 24, 2026	Official website Full listing and sources Checked September 21, 2026

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