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JCap - Invisible Captcha

JCap – Invisible WordPress Captcha

by CaeserBy · github.com/jukuan/jcap-wp-captcha · website

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Install

No release zip yet. The repository archive installs, but the folder name will carry the branch suffix and updates will not flow:

wp plugin install https://github.com/jukuan/jcap-wp-captcha/archive/refs/heads/main.zip

Readme

JCap - Invisible Captcha for WordPress

Invisible bot detection for WordPress using behavioral analysis, performance testing, and intelligent delays. No user interaction required.

How It Works

JCap uses a multi-factor detection system:

  • Behavioral Analysis — Tracks mouse movements and keyboard interactions
  • Performance Testing — Runs Sieve of Eratosthenes + Mandelbrot Set in a Web Worker
  • Browser Fingerprinting — Detects WebGL, plugins, WebDriver flags
  • Server-Side Validation — HTTP header analysis, CSRF, honeypot, rate limiting

Scores are weighted. Suspected bots receive graduated delays (0.5–8 seconds).

Protected Forms

  • WordPress Login / Register / Lost Password
  • WooCommerce Login / Register / Checkout
  • Custom forms via [jcap_form] shortcode

Quick Start


# Clone the repo
git clone https://github.com/jukuan/jcap-wp-captcha.git

# Install in WordPress
cp -r jcap-wp-captcha /wp-content/plugins/jcap

# Activate and go to Settings > JCap Captcha

Read the full README on GitHub →