On-Device Free AI Text Detector Inside a Chrome Extension

AI-generated content is becoming harder to identify.

I wanted to experiment with something simple:

What if AI detection ran fully inside the browser?

So I built HiYo, a Chrome extension that:

• Detects AI-written text on any webpage

• Runs locally (no text sent to servers)

• Adds anonymous real-time chat on the same domain

Just select any text on a webpage, right-click, and check if it was written by AI. Uses both statistical analysis and on-device ML.

Why on-device?

Privacy.

I didn’t want users to send article content to an external API.

Technical Stack:

– Chrome extension (Manifest V3)

– Local inference logic

– Real-time chat layer via domain-based rooms

Biggest challenge:

Balancing detection accuracy with performance constraints inside the browser.

Still early stage.

Would love feedback from devs here.

If you’d like to try it:

👉 Chrome Web Store: HiYo