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CPU-Z vs SIW: catalog facts
CPU-Z	SIW
Free Freeware. The site is funded by advertising and donations, and a paid SDK exists for…	Paid Commercial software; check the developer site for current editions and prices.
Windows, Android	Windows
Per-module memory SPD data, including timings, which is hard to find anywhere else Live per-core frequency and memory frequency readings	Covers hardware, software and network in one place Shows product keys and software licences
Closed source freeware; the website is ad-supported and asks you to allow ads Reports hardware facts rather than monitoring temperatures over time	Windows only Closed source
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 24, 2026

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