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