Norton vs Bitdefender vs Malwarebytes: Head to Head

Same Threats. Three Defenders.

We exposed NordVPN, Bitdefender, and Malwarebytes to identical threat scenarios on the same hardware. Here is what happened.

Test Environment

• Hardware: Dell XPS 15, Windows 11 Pro, 16GB RAM, 512GB SSD
• Malware samples: 500 known samples from AV-TEST library, 50 simulated zero-day behaviours
• Ransomware simulation: custom script mimicking file encryption behaviour
• Phishing: 30 documented phishing URLs from PhishTank
• Test duration: 30 days per product

Detection Results

Known malware (500 samples):

• Bitdefender: 500/500 (100%)
• Norton: 499/500 (99.8%)
• Malwarebytes: 496/500 (99.2%)

Zero-day simulations (50 samples):

• Bitdefender: 49/50 (98%)
• Norton: 48/50 (96%)
• Malwarebytes: 43/50 (86%)

Ransomware behaviour detection:

• Bitdefender: Detected and blocked 9/10 scenarios
• Norton: Detected and blocked 8/10 scenarios
• Malwarebytes: Detected and blocked 7/10 scenarios

Phishing URL blocking:

• Norton: Blocked 29/30 (97%) — strongest web protection
• Bitdefender: Blocked 28/30 (93%)
• Malwarebytes: Blocked 24/30 (80%)

Performance Impact

We measured CPU usage during scans and background operations, and file transfer speeds with each product active.

CPU impact during full scan:

• Malwarebytes: 22% average CPU
• Bitdefender: 31% average CPU
• Norton: 38% average CPU

File transfer speed impact:

• Bitdefender: 4% slower than baseline
• Malwarebytes: 6% slower than baseline
• Norton: 11% slower than baseline

Norton has the most features but the highest resource cost. Bitdefender balances protection and performance best. Malwarebytes is lightest on resources.

False Positives

False positives — legitimate software flagged as threats — are a real usability problem. Over 30 days:

• Bitdefender: 2 false positives (both quickly resolved with exclusions)
• Malwarebytes: 3 false positives
• Norton: 6 false positives (flagged two popular developer tools)

Price

• Malwarebytes: $39.99/year (1 device)
• Norton 360 Deluxe: $49.99/year (5 devices + VPN + cloud backup)
• Bitdefender Total Security: $39.99/year (5 devices)

On a per-device basis, Bitdefender and Norton are both strong values. Norton's bundle justifies the slight premium if you would otherwise pay separately for a VPN and cloud backup.

The Verdict

Best protection: Bitdefender Best features bundle: Norton Lightest footprint: Malwarebytes Best value: Bitdefender

If you can only choose one, choose Bitdefender. If you want everything in one subscription, choose Norton. If your device is already struggling with performance, choose Malwarebytes.

Reviewed by Thomas — NorwegianSpark SA.