Comodo Antivirus review

Comodo Antivirus takes a different approach from the rest of this list. Instead of only blocking known malware, its Auto Sandbox Technology runs unknown and suspicious programs in a virtual file system and registry, so they cannot change the real system while Comodo decides whether to trust them. That is a sensible default on an old Windows 7 PC that no longer gets security patches. Comodo also uses cloud-based scanning, which it says can identify malicious files even when local definitions are not current, plus cloud behavior analysis for zero-day threats and cloud whitelisting of trusted publishers. Quarantine, scheduled scans and a spyware scanner round it out. Comodo lists Windows 10, 8 and 7 as compatible, with no XP or Vista. The sandbox can be confusing when a legitimate old program is held back, so it suits users who are comfortable reviewing alerts. Paid options include an antivirus for 3 devices at $39.99 per year.

Who it is for

Technical Windows 7 users who want unknown programs isolated by default.

Price

Free antivirus; Comodo offers paid suites such as an antivirus for 3 devices at $39.99 per year.

Our Antivirus download features top-notch free antivirus protection
Quoted from the vendor pricing page on November 10, 2026.

Key features

• Auto Sandbox Technology that runs unknown files in a virtual file system and registry
• Cloud-based scanning that can identify malicious files without up-to-date local definitions
• Cloud-based behavior analysis for zero-day malware
• Cloud-based whitelisting of trusted publishers
• Quarantine, scheduled scans and spyware scanning

Strengths and weaknesses

• Strength: Requirements list Windows 10, 8 and 7
• Strength: Sandboxing stops unknown programs from writing to the real system
• Strength: Cloud scanning helps when local definitions are out of date
• Weakness: No Windows XP or Vista support listed
• Weakness: Sandbox decisions can confuse less technical users
• Weakness: The product page mixes in paid upsells and other products

Key facts

• Windows support listed: Windows 10, 8 and 7
• Unknown files: Run in an automatic sandbox
• Paid antivirus offer: $39.99 per year for 3 devices
• Price of free version: $0

Where it ranks

Comodo Antivirus is No. 7 in our Best Antivirus for Older Windows PCs verdict.