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On-device scam & phishing protection: warns you, spots brand look-alikes, checks messages. Nothing leaves your device. ScamShield warns you before a scam or phishing page tricks you, and it does all of its checking inside your browser. There is no server. What you browse, type or paste is never sent anywhere. WHY SCAMSHIELD Most scam blockers send the pages you visit to a company's servers and wait for a verdict. ScamShield runs the same detection on your own device instead. That means no account, no outage that leaves you unprotected, and no record of your browsing that could leak or be sold later. It is free, with no premium tier, no trial and no "upgrade to unlock real-time protection". The whole product is the free product. WHAT IT BLOCKS • Fake bank and brand logins. ScamShield compares the page's icon and logo against fingerprints for 49 well-known brands (PayPal, Microsoft and Google among them, plus regional banks, telecom and government services), and checks the address itself against a table of more than 300 brand names for look-alikes that copy a brand with foreign characters. A fake login with the right logo on the wrong domain is caught even when the address looks unfamiliar. • Fake shops. Fake countdown timers, "only 2 left" pressure, copied trust badges, requests to pay outside the platform and missing contact details are shown in a shopping card before you check out. • Crypto wallet drainers. Warns before risky approvals and blind signatures, including account-delegation and multi-wallet requests, and blocks attempts to steal your recovery phrase. • Tech-support scams. A full-screen block for "your PC is infected, call this number" pages, with a one-click exit that first defuses the page's screen-lock and Back-button traps. • ClickFix and clipboard attacks. A fake "verify you are human" check that talks you into pasting a command into Windows Run. ScamShield replaces the malicious clipboard text and blocks the page before it can run. • Leaky forms. Warns the moment a site sends the email or phone number you typed to a tracker, before you press submit. Also names fingerprinting scripts and "click Allow to continue" notification traps. • Risky search results. On Google, Bing and DuckDuckGo, a small red or amber dot marks a result whose domain is known-bad or a close brand look-alike, so you see the risk before you click. • QR codes. Decodes QR codes shown in a page's images and checks where they lead before you scan them with your phone. HOW IT WORKS 1. ScamShield reads the page on your device the moment you open it: its wording, layout, login forms and icons. It can also read a message you paste into the popup. 2. An on-device model and a set of rules score what it finds. One weak signal only ever produces a quiet "suspicious" note. A "dangerous" verdict needs several independent signals to agree, so real pages are rarely flagged by mistake. 3. You get a plain-language reason, not just a red banner, with a one-click fix: "Leave this page" on a dangerous warning, or "Take me to the real site" on a brand-impersonation page. If ScamShield got it wrong, pause the warning on that site for an hour, a day, or always. STATISTICS AND EXPLANATIONS Every warning opens a "Why this verdict?" panel that lists the exact reasons: a brand icon on the wrong domain, a look-alike address, a password field posting to another site. The Statistics tab in Settings shows pages checked, threats stopped and privacy findings, with a daily chart for the last 7 days, the last 30 days, or your totals since install. Every number is computed and stored on your device. PRIVACY ScamShield asks for access to the pages you visit because that is how the on-device analysis reads them. The check happens locally, in your browser. The one thing that leaves your device by default is a plain file download: the public list of known scam domains, fetched from ScamShield's open-source feed so blocking works right after install and while you are offline. Nothing about you or your browsing rides along with that download. Optional community reporting, off by default, can send an anonymized host name and a numeric risk signal for a page flagged dangerous. Never a URL, page text or anything you typed, and only if you turn it on yourself. Settings > About shows exactly what has left your device. FAQ How is ScamShield different from other scam blockers and AI scam-checkers? Most of them check pages by sending information to their own servers: the addresses you visit, a device ID, or the message you paste into a chatbot. ScamShield has no server. Reading the page, matching brand icons, scanning a pasted message and decoding QR codes all happen on your device. A sourced comparison against the wider field is in docs/comparison.md in the project's GitHub repository. Is ScamShield really free? What's the catch? Yes, and there is no catch. ScamShield does not run a server to bill you for, so there is nothing to upsell. Many rivals give away a limited free tier and charge monthly for real protection, or cross-sell into a paid security suite. ScamShield stays small, on-device and useful enough that you leave it installed. If you want to support development, there is a donation link in the extension, never a paywall. ALSO INSIDE • Scam message checker: paste any SMS, WhatsApp or email text for an instant, fully private verdict. • Sponsored-result check on search pages: flags an ad that goes somewhere other than the site it shows. • Strict mode: one toggle blocks even "suspicious" pages full-screen with simpler wording, for a less tech-confident family member. • Your language: all 20 languages, picked from the popup or Settings, independent of your browser's language. • Settings export/import and optional cross-device sync through your browser's own sync. Still no ScamShield account or server. • Dark mode, protection history, one-click rescue links and hidden fake prize/giveaway content. Hard numbers, not adjectives: 20 languages with full menu, warning and settings translations; around 900 automated tests; a blocklist of over 425,000 confirmed scam domains plus a million-domain watchlist, updated continuously from an open-source feed; and an install under 1 MB. Source code, privacy policy and issue tracker: github.com/joelstephen97/scamshield WHAT'S NEW IN 0.14.1 • Brand-new scam sites stay blocked. The hourly list of fresh phishing and scam sites used to lapse for a few hours whenever an update ran late. It now keeps protecting you until the next one arrives, and a broken or suspicious update is thrown out before it can block anything. • Trusting one site trusts only that site. On free website hosts, "Trust this site" used to cover every site on the same platform, scam pages included. Now it covers just the one you picked. • Off means off. Turning ScamShield off now pauses site blocking as well as the warnings, and switching it off on one computer no longer switches it off on your others. • Safer crypto wallet checks. A wallet request now waits for your answer instead of going through on its own after a few seconds. • Better at catching phishing pages hidden on free code-hosting sites. • Warning buttons say what they do. The ✕ on the warning bar now tells you whether it hides the warning for an hour or for a day, in all 20 languages. • If you clear the feed address in Settings, ScamShield downloads nothing, and it stays that way after every update. No new permissions. Still storage, declarativeNetRequest, alarms and http/https access, the same as every version since 0.3.1, and still nothing about your browsing leaves your computer.