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Microsoft Defender vs Bitdefender Total Security: catalog facts
Microsoft Defender	Bitdefender Total Security
Paid Included with a paid Microsoft 365 subscription, with a free trial available.	Paid Paid subscription, with renewal discounts for existing customers.
Windows, macOS, Android, iOS	Windows, macOS, Android, iOS
Manages security for several family members and devices from one dashboard Dark web monitoring for more than 60 types of personal information	Malware scanning, ransomware protection and firewall in one suite Covers multiple devices in a household
Requires a Microsoft account and a Microsoft 365 subscription Closed source, with protection tied to Microsoft's cloud services	Paid subscription Closed source
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account 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.