Guardio, Netcraft, Bitdefender TrafficLight, Avast and Phixo — what each one actually protects, what it costs, and how to pick. Including the cases where a tool that isn’t ours is the better choice for you.
Published 8 July 2026 · ~8 min read · By the Phixo team
Full disclosure: we make Phixo, one of the tools on this list. So read this knowing we’re not a neutral referee. We’ve tried to write the comparison we’d actually want to read — one that tells you plainly when a competitor fits you better, because most people who land here don’t need what Phixo does. Every price and feature below was checked against each vendor’s own site in July 2026 and linked so you can verify it yourself. These things change often, so confirm on the live page before you buy.
“Anti-phishing extension” covers two genuinely different jobs, and mixing them up is the most common mistake buyers make.
Site-level protection watches the web pages you visit. When you click a link and land on a known-bad or suspicious site, the extension warns or blocks you. Guardio, Netcraft, Bitdefender TrafficLight and Avast all work primarily this way — they’re a safety net at the moment you arrive on a page.
Email-level analysis looks at the message itself, before you click anything — the sender, the authentication headers, the link targets, the language. That’s a narrower job, and it’s the one Phixo focuses on inside Gmail and Outlook.
Neither is “better” in the abstract. If you want broad cover as you roam the whole web, you want a site-level tool (or a full antivirus suite). If your worry is specifically the emails landing in your inbox, email-level analysis catches things a URL check never sees. Many people are best served by one of each.
Swipe the table sideways to compare all five tools →
| Tool | Price (verified July 2026) | Main focus | Free tier | Analyzes the email itself | How it flags | Data it stores |
|---|---|---|---|---|---|---|
| Phixo | Free, or $2.99–$4.99/mo paid | Email phishing inside Gmail & Outlook | Yes — 10 scans/day (sign-in required) | Yes — 4 signal layers + AI language read | Plain-English reason for each signal | Email body never stored (fingerprint + verdict only) |
| Guardio | Free tier; $9.99/mo annual, $14.99/mo monthly (Individual) | Broad browsing, scam & data-leak protection (desktop + mobile) | Yes — basic browser protection | No — protects at the site/link level | Warning / alert on risky sites | See Guardio’s privacy policy |
| Netcraft Extension | Free | Malicious-site, phishing & fake-shop protection | Yes — fully free | No — protects at the site/link level | Block + detailed site report / risk rating | See Netcraft’s privacy policy |
| Bitdefender TrafficLight | Free | Malware & phishing site filtering | Yes — fully free | No — protects at the site/link level | Safety rating + block page | See Bitdefender’s privacy policy |
| Avast Online Security & Privacy | Free | Site safety ratings, phishing & tracker blocking | Yes — fully free | No — protects at the site/link level | Safety rating + real-time alert | See Avast’s privacy policy |
We only filled cells we could verify from each vendor’s public pages. For data retention we point you to each privacy policy rather than guess — we’re not going to state numbers for a competitor we haven’t confirmed.
Guardio is the most well-rounded consumer option here. It runs as a Chrome and Edge extension and as iOS and Android apps, so it follows you across devices — something a pure browser extension can’t. Beyond blocking scam and phishing sites, it adds data-leak alerts and account-security insights, positioning itself as everyday protection for people who click a lot of links and shop a lot online.
The trade-off is price and scope. The Individual plan is $14.99/month, or $9.99/month billed annually, with cheaper per-person Duo and Family tiers — considerably more than a focused single-purpose tool, because you’re buying much wider coverage. There’s a free tier with basic browser protection if you want to try it. If you want one subscription that watches your whole browsing life across phone and laptop, Guardio is a genuinely strong pick.
Netcraft is a long-established name in internet security, and its browser extension is completely free across Chrome, Firefox, Edge and Opera. It blocks phishing sites, fake shops and malicious scripts (like JavaScript skimmers and cryptocurrency miners), gives new or unknown sites a risk rating based on factors such as domain age and hosting history, and shows a detailed report about any site you’re on. It also lets you report suspicious URLs straight from the toolbar, feeding an operation known for large-scale phishing takedowns.
Worth knowing: Netcraft also offers a separate Outlook “Mail Reporter” add-on for flagging suspicious email — but the browser extension itself is site-level. If you want free, credible URL protection from a serious security company and don’t mind that it doesn’t analyze your inbox, it’s an easy recommendation.
TrafficLight is Bitdefender’s free, cross-browser add-on (Chrome and Firefox) that filters web traffic for malware and phishing, flags trackers, and scans links — including in search results — before you click. It’s backed by one of the most respected engines in the antivirus world, so the detection quality carries real brand weight, and it costs nothing.
Like the others in this section, it works at the page and link level rather than reading your email. If you already run Bitdefender’s antivirus or simply trust the brand, adding TrafficLight is a sensible, zero-cost layer.
Avast’s extension is free and available on Chrome, Firefox, Edge, Opera and Avast Secure Browser. It flags phishing scams, shows safety ratings on search results and sites, gives real-time alerts on suspicious pages, and layers in privacy tools like anti-tracking and a cookie-consent manager. It carries a 4.4/5 rating from more than 26,000 users, which reflects a large, satisfied install base.
It’s a solid, familiar choice if you want site-safety signals and privacy controls bundled together at no cost. As with the rest, it protects at the site level, not inside your email.
Here’s our honest pitch. Phixo does one thing the tools above don’t: it reads the email you’re looking at, in Gmail or Outlook, and analyzes it across four signal layers — sender and domain reputation (including VirusTotal), live threat-intelligence feeds refreshed roughly every 15 minutes, link-target mismatch and lookalike/homoglyph domain detection, and email authentication (SPF, DKIM, DMARC) — plus an AI read of the social-engineering language. Then it tells you, in plain English, why it flagged something, rather than just showing a red light.
On price, the paid plans are $2.99/month (Founder) or $4.99/month (Pro), with a free tier of 10 scans a day. A one-time Google or Microsoft sign-in ties your scan count to your account — there’s no anonymous mode, so we won’t claim “no signup.” On privacy, your email body is never stored: we keep only a one-way fingerprint for de-duplication and the risk verdict, and the analysis itself is discarded in real time.
What Phixo is not: it’s not whole-web browsing protection, it has no mobile app, it doesn’t block emails at the mail-server level, and it’s built for individuals, freelancers and small teams — not as an enterprise gateway. If you need those things, one of the tools above (or a full security suite) will serve you better.
There’s no shame in running two: a free site-level extension for the open web, plus an email-level tool for the inbox. They cover different gaps.
Whichever you choose, the fundamentals still matter. If you want to sharpen your own instincts, start with the 8 warning signs of a phishing email and, for the moment it goes wrong, what to do if you clicked a phishing link. For the two most-impersonated brands, we’ve also covered the fake PayPal email and the Amazon “account suspended” email.
Phixo is a browser extension that checks the email open in your Gmail or Outlook across sender and domain reputation, link mismatches, lookalike domains and email authentication (SPF, DKIM, DMARC), plus an AI read of the language — and explains, in plain English, why it flagged anything. Free plan includes 10 scans a day, no credit card. A one-time Google or Microsoft sign-in keeps your scan count tied to your account.
Install Phixo free →Your email body is never stored. Analysis happens in real time and is discarded immediately.