Say Goodbye to Bots, Meet ALTCHA, the Open Bot Defense and Your Open-source CAPTCHA Alternative

What is ALTCHA?

ALTCHA is an open-source self-hosted, privacy-first security solution that protects your websites, APIs, and online services from spam and abuse through an innovative proof-of-work mechanism.

Unlike traditional CAPTCHAs that depend on intrusive methods like cookies or fingerprinting, ALTCHA delivers robust protection while respecting user privacy.

It offers small bundle size that can be integrated into web apps, backend service easily and works seamlessly with all modern browsers.

And let's NOT forget it is GDPR, HIPAA, CCPA, CPPA, and PIPL Compliant!

Spam Filter AI: The Smart Way to Silence Spam with One Single Script!

Spam Filter AI is a smart Python app that keeps your inbox clean by automatically spotting and sorting spam emails. Using powerful tools like NLP and Naive Bayes, it analyzes email content in seconds. With its user-friendly interface and real-time results, it’s perfect for anyone who wants to save

MEDevel.com | Open-source Apps for Healthcare and EnterpriseHazem Abbas

ALTCHA: The Self-hosted Platform that protects you from Bot Abuse!

Features

• Frictionless Experience: Uses proof-of-work (PoW) instead of visual puzzles for a seamless user experience.
• Code Challenge (New in v2): Supports accessible code challenges ("enter code from image") with an audio option.
• Cookie-Free Design: GDPR-compliant by default—no cookies or tracking.
• Fully Accessible: Meets WCAG 2.2 AA-level standards and complies with the European Accessibility Act (EAA).
• Lightweight: Minimal bundle size for fast page loads and optimal performance.
• Self-Hosted: No dependency on third-party services.
• Built-in Internationalization (i18n) for 48+ languages (version 2.0)
• Improved RTL (right-to-left) language support (version 2.0)
• Enhanced WCAG accessibility (version 2.0)
• Support for accessible code challenges (image + audio options) (version 2.0)

Block Bad Bots, Spams, Vulnerability Scanners, on Nginx with NGINX BAD BOT BLOCKER

Nginx is a free and open-source web server, released in 2004 by a Russian developer. It is widely used to run and manage websites. Later, it was made available as an open-source project. Nginx is user-friendly, with simple and easy-to-configure methods that allow developers, DevOps, and webmasters to manage multiple

MEDevel.com | Open-source Apps for Healthcare and EnterpriseHazem Abbas

Supported Frontends, Backends

Altcha can be seamlessly integrated into your application or backend server, thanks to its support for multiple front-end frameworks and backend technologies.

Frontend

• React
• Vue
• Svelte
• Solid
• Lit
• Angular

Backend

• JavaScript
• TypeScript
• Python
• Go
• Elixir
• Tuby
• PHP
• Java

Protect Your Telegram Group from Spams with TG-Spam with Full OpenAI Integration, Totally Free

What is TG-Spam? TG-Spam is a free effective, self-hosted anti-spam bot specifically crafted for Telegram groups. Setting it up is straightforward as a Docker container, needing just a Telegram token and a group name or ID for the user to get started. Once activated, TG-Spam oversees messages, leveraging an advanced

MEDevel.com | Open-source Apps for Healthcare and EnterpriseHazem Abbas

Supported Web browsers

ALTCHA works on modern browsers with Web Crypto API support (specifically crypto.subtle - caniuse.com).

Supported:

• Chrome 67+ (desktop & Android)
• Edge 79+
• Firefox 63+ (desktop & Android)
• Safari 11+ (macOS & iOS)
• Any browser supporting Web Components + Web Crypto

However, it does not support Internet Explorer 11 or older versions.

License

MIT License

Resources & Downloads

• Home
• Source-code and downloads

GitHub - altcha-org/altcha: GDPR, WCAG 2.2 AA, and EAA compliant, self-hosted CAPTCHA alternative with PoW mechanism and advanced anti-spam filter.

GDPR, WCAG 2.2 AA, and EAA compliant, self-hosted CAPTCHA alternative with PoW mechanism and advanced anti-spam filter. - altcha-org/altcha

GitHubaltcha-org

ALTCHA - Next-Gen Captcha and Spam Protection

ALTCHA is a SaaS platform providing Captcha alternatives and AntiSpam protection for websites with privacy in mind.

ALTCHA