CoreDefender delivers enterprise-grade security without the bloat. Real-time threat detection, ransomware shields, and privacy tools — all in a lightweight package that won't slow you down.
Six pillars of protection that work together seamlessly to keep your digital life secure — without impacting performance.
Continuous monitoring of file system activity, network traffic, and process behavior. Threats are neutralized before they can execute.
AI-powered heuristic engine identifies zero-day threats, polymorphic malware, and fileless attacks that traditional scanners miss.
Behavioral analysis detects encryption patterns in real-time. Protected folders remain locked from unauthorized modification.
Blocks trackers, prevents webcam hijacking, and secures sensitive files with military-grade encryption at rest.
Intelligent resource management keeps CPU usage under 2%. Game mode automatically suspends non-critical scans during play.
Deep packet inspection and intrusion detection system monitors all inbound and outbound connections for suspicious activity.
A dashboard designed for clarity. See your security status at a glance and take action in one click.
Under 120MB installed. Uses less than 40MB of RAM at idle — 10x lighter than legacy antivirus solutions.
Machine learning models trained on 800M+ threat samples deliver 99.7% detection accuracy with near-zero false positives.
Automatic game mode detects fullscreen apps and defers all non-critical operations. Zero FPS impact guaranteed.
No telemetry, no data selling, no ads. Your security data stays on your device. Period.
| Feature | CoreDefender | Avast Free | Defender |
|---|---|---|---|
| Real-time Protection | ✓ | ✓ | ✓ |
| Ransomware Shield | ✓ | ✗ | ✓ |
| Privacy Tools | ✓ | ✗ | ✗ |
| Network Firewall | ✓ | ✗ | ✓ |
| Game Mode | ✓ | ✓ | ✗ |
| No Ads / Bloat | ✓ | ✗ | ✓ |
| RAM Usage (Idle) | ~40MB | ~210MB | ~180MB |
| Install Size | 6MB | 1.2GB | Built-in |
Join millions of users who trust CoreDefender to protect their digital world. Free forever — no credit card required.
See what our users have to say about CoreDefender.
"Switched from Avast and never looked back. CoreDefender uses almost no resources and caught two trojans that Avast missed completely."
"As a streamer, I need zero performance impact. CoreDefender's game mode is incredible — I literally forget it's running. Best free AV out there."
"Deployed CoreDefender across 200+ workstations. The lightweight footprint and silent operation make it perfect for enterprise environments."
Full protection at no cost. Upgrade to Pro for advanced enterprise features.
Yes, 100%. CoreDefender Free includes full real-time protection, malware scanning, ransomware shield, and privacy tools at no cost. We'll never paywall core security features. The optional Pro tier adds premium extras like VPN and dark web monitoring.
No. CoreDefender is engineered for minimal footprint — under 40MB RAM at idle and less than 2% CPU during active scans. Our game mode ensures zero impact during gaming or media playback.
Yes. CoreDefender is designed to work as a standalone solution or alongside Windows Defender. When installed, Windows Defender will automatically enter passive mode while CoreDefender handles active protection.
Currently, CoreDefender is available for Windows 10 and Windows 11 (64-bit). macOS and Linux versions are in development and expected to launch in Q3 2026.
We follow a strict privacy-first policy. No telemetry is collected, no data is sold to third parties, and all threat analysis happens locally on your device. Cloud lookups use anonymized hashes only.
Our threat intelligence database is updated every 15 minutes via lightweight delta updates. Critical threat signatures are pushed instantly via our real-time cloud network.