The Free, Open-Source & Lightweight Security Captcha Solution. Built for maximum security with zero database costs and dynamic UI customization.
In today's web, protecting your forms from bots, brute-force attacks, and spam is essential. Traditional captchas often require heavy database setups, track user data aggressively, or ruin the UI/UX of modern websites.
S-Captcha solves this with a developer-first approach:
- ⚡ Ultra-Fast & Lightweight — Built with pure vanilla HTML, CSS, and JS for zero load-time impact on your main site.
- 🛡️ Zero-Database Overhead — Uses encrypted, stateless verification, eliminating the need for expensive database infrastructure.
- 🔒 Privacy-Focused — Protects your users without selling or tracking their personal data.
- 🎨 Fully Customizable — Easily match the captcha design to your site's branding with built-in widget styles.
- 3-Layer Security Shield
- Invisible Smart Captcha
- Text & Interactive Challenge Captcha
- Image Captcha with Invisible Honeypot
- Multi-Color Widget Styles — Choose between
Default,White,Black, andRGB(glowing/cyber) themes to match your design. - Smart Rate Limiting — Automatic temporary IP restriction to prevent brute-force and automated bot attacks.
- OAuth Integration — Secure authentication via Google, GitHub, and Facebook.
- AGPLv3 Licensed — Open-source, transparent, and copyleft-protected.
S-Captcha ships with direct snippet configuration for different color themes:
| Theme Option | Ideal For |
|---|---|
| Default | Classic dark/light dynamic interfaces |
| White | Clean, minimalist, light-themed websites |
| Black | Stealth, dark-mode, minimalist aesthetics |
| RGB | Futuristic, cyber, or hacker-style UI |
Drop this single line into your site's <head> tag to activate S-Captcha instantly:
<script src="https://www.scaptua.duckdns.org/widget.js" async defer></script>📌 Note: For the full feature set, configuration options, and documentation, visit scaptua.duckdns.org.
S-Captcha is actively maintained — if you run into an issue, please report it and it'll be fixed as soon as possible.
📧 Email: sgdev@netc.fr
Released under the AGPLv3 License — free to use, modify, and share, with copyleft protections to keep it open for everyone.