Remura

About

Remura - AI Agent Prompt Injection Detector

Remura silently scans every page you visit for hidden prompt injection attacks, malicious instructions embedded in web pages that attempt to hijack AI agents browsing on your behalf.

How it works
When a page loads, Remura scans the DOM for 8 types of hidden instruction techniques: invisible text, off-screen elements, color-matched text, tiny fonts, aria-hidden abuse, HTML comments, suspicious meta tags, and CSS content injection.

If injections are found, a blocking overlay appears with a 30-second countdown. A human can click "I acknowledge this risk" to dismiss it. An AI agent cannot when the timer expires, a desktop alert fires and the page stays blocked.

What it detects
• Instruction overrides ("ignore previous instructions", "new instructions")
• Role manipulation ("you are now", "act as")
• Data exfiltration commands ("send conversation to", "reveal system prompt")
• Action hijacking ("instead output", "do not complete")

Zero data collection. All scanning happens locally in your browser. Nothing leaves your device.