On-Device Free AI Text Detector Inside a Chrome Extension

Saikat Mondal — Mon, 16 Feb 2026 17:55:07 +0000

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

Forem: Saikat Mondal