Antibot Detector
Instantly Detect Anti-Bot Systems & CAPTCHAs on Any Website
Free Chrome extension that automatically identifies 26+ security technologies including CAPTCHAs, anti-bot protection, and fingerprinting techniques as you browse. Perfect for developers, security researchers, and web scraping enthusiasts.
- Detect 26+ Security Technologies - Automatically identify Cloudflare, DataDome, PerimeterX, Akamai, reCAPTCHA, hCaptcha, and more on any website you visit.
- Fingerprinting Analysis - Detect Canvas, WebGL, Audio, Font, and WebRTC fingerprinting techniques used to track your browser uniquely.
- Real-Time Detection - Results appear instantly as pages load. Multi-layer analysis examines DOM, network requests, JavaScript APIs, and window properties.
- 100% Local Detection - All analysis happens in your browser. No data transmission, no tracking, no external servers. Fully local operation.
- Open Source (NPOSL-3.0) - Free for personal and non-profit use. View source code, contribute features, and customize detection rules on GitHub.
What Can Antibot Detector Identify?
CAPTCHA Systems
reCAPTCHA (v2/v3), hCaptcha, FunCaptcha, GeeTest, Turnstile
Anti-Bot Systems
Cloudflare, DataDome, PerimeterX, Akamai, Shape, AWS WAF, Imperva
Powerful Detection Features
Multi-Layer Detection
Four detection methods working together
DOM Inspection - Scans page elements for CAPTCHA widgets
Network Monitoring - Analyzes HTTP headers and cookies
JavaScript Hooks - Detects fingerprinting via browser APIs
Window Properties - Identifies injected security objects
Smart Performance
Optimized for minimal browser overhead
12-Hour Caching - Results cached per domain
LRU Pattern Cache - 60-80% faster pattern matching
Early-Exit Detection - Stops once match is found
Lazy Evaluation - Detection runs only when needed
Detection History
Track technologies across your browsing
Confidence Scoring - See detection certainty levels
Historical View - Browse past detections by site
Export Data - Save results for analysis
Filter & Search - Find specific technologies quickly
Advanced Tools
Specialized modules for deep analysis
reCAPTCHA Extractor - Extract tokens and sitekeys
Akamai Sensor - Analyze bot detection sensors
Challenge Pages - Handle AWS WAF, Shape Security
Custom Rules - Add your own detection patterns
Who Uses Antibot Detector?
Web Developers
Test anti-bot implementations on your sites. Verify CAPTCHA configurations and security layer deployments work as expected.
Security Researchers
Analyze website security postures. Study anti-bot trends, fingerprinting techniques, and protection strategies across the web.
Web Scraping Pros
Identify challenges before building scrapers. Know which anti-bot systems protect target sites to plan bypass strategies.
How It Works
Install Extension
One-click install from Chrome Web Store. No registration needed.
Browse Normally
Visit any website. Automatic background scanning for anti-bot tech.
View Results
Click the icon to see detected technologies and confidence scores.
Analyze & Export
Review history, export data, or use advanced analysis tools.
1. Install Extension
One-click install from Chrome Web Store. No registration needed.
2. Browse Normally
Visit any website. Automatic background scanning for anti-bot tech.
3. View Results
Click the icon to see detected technologies and confidence scores.
4. Analyze & Export
Review history, export data, or use advanced analysis tools.
Open Source & Free for Non-Profit
Antibot Detector is open source and free for personal and non-profit use. Built by the Scrapfly team for the developer community.
- View Source Code - Inspect, audit, and contribute on GitHub
- Contribute Features - Submit PRs to add new detectors or improve accuracy
- Community Driven - Built and maintained by Scrapfly for the developer community
- NPOSL-3.0 Licensed - Free for personal & non-profit use, commercial licensing available
git clone https://github.com/scrapfly/Antibot-Detector
cd Antibot-Detector
npm install
npm run build
# Load unpacked extension in Chrome
# chrome://extensions > Enable Developer Mode
# > Load unpacked > Select 'dist' folderFrequently Asked Questions
What is Antibot Detector?
Antibot Detector is a free Chrome extension that automatically identifies security technologies on websites as you browse. It detects 26+ systems including CAPTCHAs (reCAPTCHA, hCaptcha), anti-bot protection (Cloudflare, DataDome, PerimeterX), and fingerprinting methods (Canvas, WebGL, Audio). Perfect for developers, security researchers, and anyone interested in web security.
Is Antibot Detector really free?
Yes! Antibot Detector is free for personal and non-profit use with no hidden costs, subscriptions, or premium tiers. It's open source (NPOSL-3.0 License) and will always remain free for non-commercial purposes. Commercial use requires separate licensing. The project is maintained by Scrapfly as a community contribution.
Does it collect or send any data?
No. Antibot Detector is 100% privacy-first. All detection happens locally in your browser. The extension does not collect, store, or transmit any browsing data, analytics, or telemetry. You can verify this by reviewing the open source code.
What technologies can it detect?
Antibot Detector identifies 26+ security technologies across three categories:
CAPTCHAs: reCAPTCHA (v2/v3), hCaptcha, FunCaptcha, GeeTest, Turnstile
Anti-Bot Systems: Cloudflare, DataDome, PerimeterX, Akamai, Shape Security, AWS WAF, Imperva, Kasada, and more
Fingerprinting: Canvas, WebGL, Audio, Font, WebRTC tracking techniques
How accurate is the detection?
Detection uses multi-layer analysis (DOM inspection, network monitoring, JavaScript API interception, window properties) for high accuracy. Each detection includes a confidence score. The extension employs pattern matching against known signatures and behavior analysis. While very accurate, some advanced or custom anti-bot systems may not be detected.
Does it slow down my browsing?
No. Antibot Detector is optimized for minimal performance impact. It uses smart caching (12-hour expiry), LRU pattern caching, early-exit detection, and lazy loading. Detection runs in the background without blocking page loads. Most users won't notice any performance difference.
Can I contribute to the project?
Absolutely! Antibot Detector is open source and welcomes contributions. You can: submit PRs to add new detectors, improve accuracy, fix bugs, or enhance features. Visit the GitHub repository to get started.
Is it available for other browsers besides Chrome?
Currently, Antibot Detector is available as a Chrome extension (Manifest V3). Since it uses standard web extension APIs, it should work on other Chromium-based browsers (Edge, Brave, Vivaldi). Firefox support is planned for the future. Check the GitHub repository for updates.