Simple. Private. Yours.

aCAPTCHA is a free and open-source alternative to commercial CAPTCHA systems. It’s not the most advanced solution out there β€” and it’s not trying to be. But for many simple, personal, or low-risk projects, it gets the job done without tracking users or locking features behind a paywall.

99.9% Uptime
Zero Data Tracking
100% Open Source

Interactive Demo

Experience the power and flexibility of aCAPTCHA with our live demonstration featuring real-time analytics and customization options.

Try the Enhanced CAPTCHA

πŸ“ Real-time Event Log

Powerful Features

Built with modern web standards and user experience in mind, offering unprecedented customization and control.

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Seamless Reset Capability

Reset verification challenges multiple times without page refreshes, maintaining user context and improving experience flow.

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Rich Audio Feedback

Interactive sound effects with intelligent toggling, providing enhanced accessibility and user engagement without being intrusive.

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Adaptive Theming

Automatic dark/light mode detection with manual override, ensuring optimal visibility across all environments and user preferences.

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Intelligent Hints

Context-aware assistance that guides users through challenges without compromising security or revealing solutions.

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Advanced Analytics

Comprehensive performance metrics, success rates, and user behavior insights without compromising privacy or collecting personal data.

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Adaptive Difficulty

Dynamic challenge scaling from Easy to Extreme based on threat assessment and user interaction patterns.

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Privacy-First Design

Zero data collection, no third-party dependencies, and complete offline functionality ensuring user privacy is never compromised.

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Universal Accessibility

WCAG 2.1 AA compliant with screen reader support, keyboard navigation, and alternative verification methods for all users.

Comprehensive Comparison

See how aCAPTCHA compares to traditional solutions in terms of privacy, customization, and user experience.

πŸ“Š aCAPTCHA vs Google reCAPTCHA

A detailed feature and capability comparison

Feature aCAPTCHA Google reCAPTCHA v2/v3
Pricing Model βœ… Free and open source ⚠️ Free but proprietary
Privacy & Data Collection βœ… Zero tracking or data sharing ❌ Extensive behavior tracking, tied to Google ecosystem
Customization Options βœ… Fully customizable UI, behavior, and language ❌ Minimal to no customization options
Accessibility Compliance βœ… WCAG 2.1 AA compliant with comprehensive audio support ❌ Often frustrating for screen readers and disabled users
Bot Detection Method ⚠️ Challenge-based with adaptive difficulty βœ… Advanced ML + behavioral profiling
Setup Complexity βœ… Self-hosted, minimal configuration required ⚠️ Easy integration but requires Google account/API keys
Offline Capability βœ… Fully functional offline ❌ Requires internet connection to Google servers
Performance Impact βœ… Lightweight, no external dependencies ❌ Additional HTTP requests and external script loading
User Experience βœ… Consistent, predictable challenges ❌ Unpredictable difficulty, sometimes unsolvable
Vendor Lock-in Risk βœ… Open source, community-driven ❌ Dependent on Google's service availability
Analytics & Insights βœ… Detailed local analytics without privacy concerns ⚠️ Limited insights, data stored by Google
βœ…

aCAPTCHA Advantages

  • πŸ”’ Complete Privacy: No data collection or user tracking
  • 🎨 Full Customization: Adapt to any design system
  • β™Ώ True Accessibility: Works for all users, all abilities
  • 🌐 Offline Ready: Functions without internet dependency
  • ⚑ Lightweight: Minimal performance impact
  • πŸ› οΈ Open Source: Transparent, community-driven development
  • πŸ’° Cost Effective: No usage limits or hidden fees
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Considerations

  • πŸ€– Bot Detection: Less sophisticated than ML-based solutions
  • πŸ”§ Self-Hosting: Requires basic technical setup
  • πŸ“ˆ Scaling: Need to manage infrastructure growth
  • πŸ”„ Updates: Manual maintenance of security patches
  • πŸ“Š Analytics: Limited compared to enterprise solutions
  • 🎯 Targeting: May need additional fraud detection layers

Download & Import

Get the latest aCAPTCHA files for your project or use our CDN links for instant integration.

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Direct Downloads

Download the complete aCAPTCHA package to your local machine.

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CDN Import

Use our CDN links for instant integration without downloads.

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GitHub Repository

Download or fork it from the official git repo; all versions can be found on releases.

πŸ“– Quick Integration Examples

<!-- Using CDN (Replace with your actual URL) -->
<script src="https://your-repl-url.replit.dev/captcha-v1.1.js"></script>

<!-- Basic implementation -->
<captcha-element 
    status="null" 
    sound-enabled="true" 
    dark-mode="auto" 
    type="both"
    difficulty="adaptive">
</captcha-element>
<!-- Using local file -->
<script src="./js/aCAPTCHA-v1.1.js"></script>

<!-- Advanced configuration -->
<captcha-element 
    type="visual"
    theme="dark"
    language="en"
    hints="true"
    analytics="true"
    retry-limit="3">
</captcha-element>

Implementation Guide

Get started with aCAPTCHA in minutes with our comprehensive documentation and examples.

Quick Start Integration


<!-- Include the aCAPTCHA script -->
<script src="https://cdn.acaptcha.pro/v1.1/acaptcha.min.js"></script>

<!-- Basic implementation -->
<captcha-element 
    status="null" 
    sound-enabled="true" 
    dark-mode="auto" 
    type="both"
    difficulty="adaptive">
    </captcha-element>

<!-- Advanced configuration -->
<captcha-element 
    type="visual"
    theme="custom"
    language="en"
    hints="true"
    analytics="true"
    retry-limit="3">
</captcha-element>
                        

// Event handling and API usage
const captcha = document.querySelector('captcha-element');

// Listen for verification events
captcha.addEventListener('verified', (event) => {
    const { verified, timeSpent, attempts, difficulty } = event.detail;
    console.log('Verification successful!', {
        verified,
        timeSpent: `${timeSpent}ms`,
        attempts,
        difficulty
    });

    // Proceed with form submission
    if (verified) {
        submitForm();
    }
});

// Listen for status changes
captcha.addEventListener('statuschange', (event) => {
    console.log('Status changed to:', event.detail.status);
    updateUI(event.detail.status);
});

// Listen for reset events
captcha.addEventListener('reset', () => {
    console.log('CAPTCHA reset - ready for new attempt');
    clearFormErrors();
});

// API Methods
console.log('Current status:', captcha.getStatus());
console.log('Is verified:', captcha.isValid());
console.log('Analytics data:', captcha.getAnalytics());

// Programmatic control
captcha.reset();                                    // Reset the challenge
captcha.setAttribute('difficulty', 'hard');        // Change difficulty
captcha.setAttribute('theme', 'dark');             // Switch theme
captcha.setAttribute('sound-enabled', 'false');    // Disable sounds
                        

// Advanced analytics integration
function handleCaptchaAnalytics() {
    const analytics = captcha.getAnalytics();

    // Send to your analytics service
    trackEvent('captcha_analytics', {
        success_rate: analytics.successRate,
        average_time: analytics.averageTime,
        total_attempts: analytics.totalAttempts,
        difficulty_distribution: analytics.difficultyCounts,
        accessibility_usage: analytics.audioModeUsage
    });

    // Update dashboard
    updateDashboard(analytics);
}

// Form integration example
function validateFormWithCaptcha() {
    const form = document.getElementById('signup-form');
    const captcha = document.querySelector('captcha-element');

    form.addEventListener('submit', (e) => {
        e.preventDefault();

        if (!captcha.isValid()) {
            showError('Please complete the security verification');
            captcha.focus(); // Accessibility-friendly focus
            return;
        }

        // Proceed with form submission
        const formData = new FormData(form);
        formData.append('captcha_verified', true);
        formData.append('captcha_token', captcha.getToken());

        submitForm(formData);
    });
}