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SIW vs ProduKey: catalog facts
SIW	ProduKey
Paid Commercial software; check the developer site for current editions and prices.	Free Freeware from NirSoft; free to use and redistribute unmodified at no charge.
Windows	Windows, Command line
Covers hardware, software and network in one place Shows product keys and software licences	Recovers keys for Windows, Office, SQL Server and Exchange Reads keys from remote computers, other installations and external drives
Windows only Closed source	Does not recover every licence type; keys not stored in the Registry may be unavailable Office support listed by the developer covers Office 2000 through 2010
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License: Freeware
Not stated if an account is needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 8, 2026

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