What free actually includes
Avast Free Antivirus is more generous than most free competitors. The detection engine is the same one used in the paid Avast One product.
- Real-time malware scanning. Files are scanned as they're written to disk, opened, or executed.
- Web Shield. Blocks known malicious websites at the network layer before pages render.
- Email Shield. Scans inbound and outbound mail attachments via POP3/IMAP. Doesn't work with web-only mail like Gmail's browser interface, but does work with Outlook desktop, Thunderbird, and similar.
- Wi-Fi Inspector. Scans devices on your home network for known vulnerabilities and weak passwords on the router itself.
- Password leak checker. Lets you paste an email address and see if it appears in known data breaches (basic Have I Been Pwned-style lookup).
- Smart Scan. One-click sweep that combines malware scan, network check, browser-extension audit, and performance suggestions.
What free does NOT include
- Firewall. Avast Free relies on Windows Firewall. Paid tiers add Avast's own firewall with more granular control.
- Ransomware Shield. Behavioral defense against ransomware encrypting your files. Paid only.
- Sensitive Data Shield. Watches for apps trying to access personal documents. Paid only.
- Real Site (anti-DNS-hijack). Paid only.
- VPN. Avast SecureLine VPN is a separate paid product.
- Sandbox. Run suspicious programs in isolation. Paid only.
The upgrade nag problem
Avast Free is ad-supported in a specific way: the application UI itself shows upgrade banners, scan results include upsells for the paid tier, and certain features (sandbox, advanced firewall) display "Upgrade to unlock" when you try to use them. Users on long-running PCs report 1 to 3 upgrade prompts per week. The behavior is less aggressive than McAfee but more visible than Bitdefender Free.
The privacy track record you should know about
This is the part people don't always notice when comparing free antivirus products. Avast operated a subsidiary called Jumpshot from 2014 to 2020 that resold detailed user browsing data to corporate clients. The practice came to public attention via PCMag and Vice reporting in January 2020, and Jumpshot was shut down within a week.
In February 2024 the US FTC fined Avast $16.5 million and entered a consent decree that:
- Banned Avast from selling browsing data for advertising purposes;
- Required deletion of all the historical Jumpshot data and any models trained on it;
- Required clear opt-in consent for any future browser data collection by Avast.
The infrastructure that did the selling no longer exists. The consent decree legally binds Gen Digital (Avast's parent since the 2022 merger with NortonLifeLock). But the pattern matters to many users regardless. If it matters to you, Bitdefender Free is a comparable alternative without that history. See the full Avast safety FAQ for the complete timeline.
Avast Free vs Avast One Essential (also free)
Confusingly, Avast also offers a free tier of "Avast One" called Avast One Essential. The differences:
- Avast One Essential includes a basic VPN (5 GB/week) and basic identity-monitoring on top of Free Antivirus features.
- The interface is the newer Avast One unified dashboard rather than the classic Avast Antivirus UI.
- It nags less aggressively but pushes you toward Avast One paid tiers instead.
If you're starting fresh, Avast One Essential is the more modern choice. If you already use Avast Free Antivirus and it works for you, there's no urgent reason to switch.
Verdict
Avast Free is a strong free antivirus from a detection standpoint. The detection engine is genuinely top-tier and the feature set is broader than most free competitors. The decision comes down to two things: can you tolerate the upgrade nags, and does Avast's privacy history bother you? If both answers are "fine," it's a solid pick. If either is a deal-breaker, Bitdefender Free covers the same protection ground without the baggage.