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Purple Knight vs Maester: catalog facts
Purple Knight	Maester
Free The Community edition is free to download from Semperis.	Free Free and open source, community driven.
Windows	Command line
Covers on-premises AD, Entra ID and Okta in one assessment More than 230 indicators of exposure and compromise	More than 360 ready-made security tests Five compliance baselines in a single report
Closed source Assessment tool only; it does not fix issues itself	Limited to Microsoft 365 and Entra tenants Requires PowerShell and Microsoft Graph permissions
Downloadable app	Downloadable app
Closed source	Open 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 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.