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[ARTICLE · art-54482] src=dev.to ↗ pub= topic=artificial-intelligence verified=true sentiment=· neutral

How I built a Chrome extension that reads Terms of Service using AI — and what I found

A developer built ToS Radar PRO, a Chrome extension that uses local AI inference to scan Terms of Service and Privacy Policy pages for dangerous clauses like AI data scraping, forced arbitration, and auto-renewals. Testing against 50+ websites found that 97% reserve the right to train AI on user data, 83% include forced arbitration, and 76% have hidden auto-renewal terms. The extension runs entirely in the browser with no external API calls to preserve user privacy.

read2 min views1 publishedJul 10, 2026

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The problem that made me build this

Every time I signed up for a new app or service, I clicked "I Agree" without reading a single line. Nobody reads Terms of Service. They're 30+ pages of dense legal language designed to be ignored.

But I kept hearing horror stories:

  • Apps training their AI on your private photos
  • Subscriptions auto-renewing for €99/year after a free trial
  • Platforms stripping your right to sue them (forced arbitration)
  • Companies sharing your data with hundreds of "partners"

So I built ToS Radar PRO — a Chrome extension that reads the fine print so you don't have to.

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How it works

The extension uses AI to scan any Terms of Service or Privacy Policy page and flags six categories of dangerous clauses:

AI/Data Scraping — "We may use your content to train our AI models" #

Forced Arbitration — You waive your right to take them to court #

Auto-Renewals — Subscription traps buried in paragraph 47 #

Data Sharing — Your data sold to advertisers and data brokers #

Unilateral Changes — They can change the terms anytime without notice #

Account Termination — They can delete your account for any reason

The key architectural decision: everything runs locally in your browser. No API calls, no external servers, no data leaving your machine. Pure privacy.

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Tech stack

  • Chrome Extension Manifest V3
  • Vanilla JavaScript (no frameworks — keeping it lean)
  • Local AI inference via the browser
  • Zero external dependencies

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What I found while testing

After running it against 50+ popular websites, here are the most common traps:

97% of apps reserve the right to train AI on your data #

83% include forced arbitration clauses #

76% have auto-renewal terms that are hard to find #

100% reserve the right to change terms at any time

The worst offenders? Social media platforms and productivity SaaS tools.

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Try it free ToS Radar PRO is completely free on the Chrome Web Store:

Install ToS Radar PRO Would love feedback from the DEV community — especially on the tech approach and features you'd want added. What clauses do you care about most?

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