ScamShield

On-device scam & phishing protection for Chrome, Edge, Brave, Opera and Firefox. Free and open source.

Add to Chrome — it's free View source on GitHub

Works in any Chromium browser (Chrome, Edge, Brave, Opera, Vivaldi). Firefox: download scamshield-firefox.zip from the latest release (AMO listing pending) — see the install notes.

What it does

Warns before you're trickedA clear banner with plain-language reasons on suspicious and dangerous pages, and one click back to safety — Leave this page or Take me to the real site.
Reads the page, not just the addressAn on-device model looks at wording, layout and login forms, and a favicon/logo check spots brand look-alikes (icon fingerprints for 49 brands, plus a 326-brand name and domain table covering UAE banks, telcos and government services).
Guards the risky momentsFake login forms posting to another site, crypto-wallet drainers, clipboard hijacks ("paste this to verify"), and "your PC is infected, call now" scare pages.
Checks a message for youPaste any SMS, WhatsApp or email text into the popup for an instant, fully private verdict.
Blocks known scam domainsAn open-source blocklist rebuilt several times a day from 14 aggregated threat databases (425k+ confirmed scam domains, heavily false-positive filtered) via the scamshield-feed.
Private by designNothing you browse, type or check leaves your device. No accounts, analytics, ads or trackers. About 0.6 MB. Read the privacy policy.

Screenshots

ScamShield popup warning on a fake login page Statistics dashboard in dark mode: pages checked, threats stopped and privacy findings, all counted on the device In-page warning banner with a rescue link to the real site Popup language menu open, listing ScamShield's 20 languages Wallet-drainer overlay blocking a fake Connect and Claim request

How ScamShield compares

Free, alwaysNo premium tier, no upsell — every feature above is free forever.
On-device, not a chatbotThe new wave of AI scam-checkers — Norton Genie, Trend Micro Check and Bitdefender Scamio — score your pasted messages on their own servers, by their own disclosures; ScamShield's engine reads them on your device instead.
Explains every verdictA plain-language reason on every warning — most rivals show a badge or score with no explanation of why.
20 languagesFull menu, warning and settings translations, not just a translated store listing.

Full sourced comparison against Guardio, Malwarebytes Browser Guard, Norton Safe Web, McAfee WebAdvisor, Bitdefender TrafficLight, Netcraft, Avast Online Security, ScamAdviser, WOT, Trend Micro, Emsisoft, DuckDuckGo Scam Blocker, ScamSniffer/Wallet Guard, Norton Genie and Bitdefender Scamio: docs/comparison.md on GitHub.

Links