Lovable (formerly GPT Engineer) is a full-stack AI application builder that creates complete React web applications — including frontend, backend logic, and Supabase database — from natural language prompts. Unlike website builders that produce marketing pages, Lovable builds interactive applications with user authentication, real-time data, and API integrations. It's used by startups and developers to rapidly prototype SaaS products, internal tools, and web apps that would otherwise require a development team. Lovable has surpassed 1 million users and powers thousands of production applications. Sites can be detected through requests to lovable-uploads.s3.amazonaws.com for stored files and *.lovable.app domains for hosted projects. Pricing starts free with a usage cap, and Pro plans begin at $20/month.
Detect Lovable Websites — Free Tool
Enter any URL to check if it was built with Lovable. Instant results, no account required.
How to Detect Lovable Websites
Script Patterns
5 patterns
CDN Domains
4 patterns
HTML Patterns
8 patterns
HTTP Headers
3 patterns
Meta Tags
3 patterns
1. Check the Page Source
Open the website in your browser, right-click, and select "View Page Source". Search for lovable-specific patterns in the HTML.
2. Look for Script Files
Check the Network tab in DevTools for JavaScript files loaded from Lovable domains.
3. Check CDN Domains
Network requests to these CDN domains indicate a Lovable site:
lovable-uploads\.s3lovable\.devlovable\.appgptengineer\.app4. Use AI Website Detector (Easiest)
Our automated scanner checks all these signals at once and gives you an instant confidence score. Just enter any URL above.
Frequently Asked Questions
Is this website built with Lovable?
You can detect if any website was built with Lovable by using our free scanner above. Just enter the URL and we'll analyze HTML patterns, JavaScript files, CDN domains, and HTTP headers to determine if Lovable was used — with a confidence score.
How to detect if a website was built with Lovable?
There are several ways to detect Lovable: (1) View the page source and look for Lovable-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to Lovable CDN domains, (3) Use our free tool — we check 20 detection signals automatically.
What websites are built with Lovable?
Lovable is used by thousands of websites worldwide. Our scanner has detected many Lovable-built sites across different industries. You can scan any URL to check if it uses Lovable.
How accurate is the Lovable detection?
Our Lovable detection engine checks 20 unique fingerprint signals, achieving high confidence results. We score each match and return a confidence percentage so you know how certain the detection is.
About Lovable
Lovable is a leading ai website builder used by thousands of businesses and developers worldwide. Our detection engine can identify Lovable-built websites with high confidence by analyzing multiple technical signals.
Whether you're a developer doing competitive research, a designer looking for inspiration, or just curious about how a website was built — AI Website Detector gives you instant, accurate detection.
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Detection Info
- Category
- AI Website Builder
- Signals Used
- 20 patterns
- Accuracy
- High
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