ANTIVIRUSREVIEWFind Best Antivirus
WindowsFree PlanReal-Time Protection
MD

Microsoft Defender Antivirus

The free, built-in Windows antivirus that's quietly gotten very good

Microsoft Defender is free, pre-installed, and has closed most of the gap with paid suites — a legitimate baseline for budget-conscious or minimalist users.

Read full review
Overall score
7.6
out of 10
Price
Free (built into Windows)
Platforms
Windows
Best for
Home
Support
Microsoft support documentation and community forums
Protection Rate97%

Microsoft Defender's detection has improved substantially in recent years, now scoring within a few points of several paid suites in independent lab tests.

Performance Impact99%

Being built directly into Windows, it has the lowest possible overhead of anything in this list, with no separate background service to manage.

Pros
✓Completely free and pre-installed on every Windows PC
✓Deep OS-level integration with minimal performance overhead
✓Detection scores now close to several paid competitors
✓No separate account, install, or renewal to manage
Cons
–Windows only — no Mac, Android, or iOS app
–No VPN, password manager, or identity monitoring
–Fewer proactive extras like banking-mode browsers or firewalls tuning UI
Features

Coverage is genuinely solid for core protection — ransomware folder controls, SmartScreen, and cloud-delivered updates — but there's no VPN or password manager.

Real-time malware & ransomware protection
Cloud-delivered protection
Controlled folder access (ransomware)
Windows Firewall integration
SmartScreen phishing/site reputation checks
Device performance & health reports
Pricing

It's free and already installed — there's no purchase decision to make, which is exactly the point for minimalist or budget setups.

UI / UX

Windows Security's interface is plain but functional, tucked into Settings rather than a standalone app, with fewer configuration options than dedicated suites.

Compare with
Microsoft Defender Antivirus vs Bitdefender Total Security →Microsoft Defender Antivirus vs Norton 360 Deluxe →Microsoft Defender Antivirus vs Kaspersky Premium →
JV
Reviewed by
Jordan Voss · Editor-in-Chief, Security Testing
Frequently asked questions
For most careful users on Windows 11 with automatic updates on, yes — its detection scores are now competitive, though it lacks a VPN and identity tools.