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DefenderUI vs OSArmor: catalog facts
DefenderUI	OSArmor
Best for: Windows users who want to harden Microsoft Defender without a third-party antivirus	Best for: Windows users who want an extra anti-ransomware layer on top of their antivirus
Free + paid options The standard edition is free; a Pro edition adds WDAC and sandbox features.	Free + paid options Free to download; the site also lists an enterprise edition.
Windows	Windows
Exposes Defender protection settings hidden by Windows Security Free edition covers most home users All 4 strengths for DefenderUI Exposes Defender protection settings hidden by Windows Security Free edition covers most home users Silent install and command-line management for businesses Pro edition automates WDAC application control policies	Blocks common malware delivery techniques such as Office macros launching shells Over 250 built-in policies with no setup needed All 3 strengths for OSArmor Blocks common malware delivery techniques such as Office macros launching shells Over 250 built-in policies with no setup needed Lightweight and works alongside an existing antivirus
Windows 10 and 11 only Closed source All 3 limitations for DefenderUI Windows 10 and 11 only Closed source Advanced lockdown features require the Pro edition	Windows only Behaviour blocking can stop legitimate scripts and admin tools
Downloadable app	Downloadable app
Not open source	Not 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	Offline features available
Official website Full listing and sources Sources for DefenderUI defenderui.com Catalog checked October 2, 2026	Official website Full listing and sources Sources for OSArmor osarmor.com Catalog checked October 2, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.