Detect Deceptive Login Pages

Grizzly is a lightweight browser extension that warns you when a page impersonates a trusted brand.

Phishing Pages Often Look Legitimate

  • Attackers clone trusted brands with convincing visuals

  • URL checks and reputation systems often miss these pages

  • Users only realize the problem after credentials are stolen

How it Works

Grizzly helps you spot deceptive login pages before credentials are entered.

Runs directly in your browser

Grizzly evaluates pages as you see them, not from a remote scanner.

Focuses on deceptive login flows

Focuses on deceptive login flows

Focuses on deceptive login flows

It detects pages designed to look like trusted brands.

Warns you at the moment that matters

Alerts appear before credentials are entered.

FAQ

Does Grizzly replace Google Safe Browsing or my browser’s built-in protections?
Does Grizzly see or store my passwords?
Which browsers are supported?
Does Grizzly replace Google Safe Browsing or my browser’s built-in protections?
Does Grizzly see or store my passwords?
Which browsers are supported?
Does Grizzly replace Google Safe Browsing or my browser’s built-in protections?
Does Grizzly see or store my passwords?
Which browsers are supported?

Questions or feedback?

© 2026 Upstream Labs

Questions or feedback?

© 2026 Upstream Labs

Questions or feedback?

© 2026 Upstream Labs