Privacy-friendly CAPTCHA system. Pure CSS + HTML, no JS or CDNs required. Designed with the needs of Tor onion services in mind.
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FreeCAPTCHA is a new CAPTCHA system for privacy-focused websites. No JS, minimal dependencies, all on-premise (no 3rd party APIs required).

Here's a minimalistic implementation, to show you what it looks like:

initial page

Let's try selecting an incorrect option:

wrong select

And we submit, to see what happens:

wrong result

Okay, what if select the correct image?

right select

And smash that submit button to see where it goes!

right result

Viola! Although the concept works, it's mostly just that, a proof of concept. The code needs to be modularized into a library that can be loaded into a little iframe for easy integration