Builder.io is a visual headless CMS and experience management platform that lets marketing and product teams visually edit content on any website or app built with any frontend framework — React, Vue, Angular, Next.js, or even native mobile apps. Unlike traditional CMSes, Builder.io uses a visual drag-and-drop editor that overlays directly on the live site, letting non-developers make layout changes without touching code. It's used by enterprise teams at companies like Microsoft, Snap, and Everlane for landing pages and experiment-driven content. Sites using Builder.io load scripts from cdn.builder.io and include builder-component, builder-block, and builder-content-id attributes throughout the DOM markup — these are the primary detection fingerprints. The Builder.io query API is accessed from builder.io/api/v1/ endpoints. Pricing starts at a free tier, with Growth plans from $10/month.
Detect Builder.io Websites — Free Tool
Enter any URL to check if it was built with Builder.io. Instant results, no account required.
How to Detect Builder.io Websites
Script Patterns
2 patterns
CDN Domains
1 patterns
HTML Patterns
2 patterns
Meta Tags
1 patterns
1. Check the Page Source
Open the website in your browser, right-click, and select "View Page Source". Search for builder.io-specific patterns in the HTML.
2. Look for Script Files
Check the Network tab in DevTools for JavaScript files loaded from Builder.io domains.
3. Check CDN Domains
Network requests to these CDN domains indicate a Builder.io site:
cdn\.builder\.io4. 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 Builder.io?
You can detect if any website was built with Builder.io 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 Builder.io was used — with a confidence score.
How to detect if a website was built with Builder.io?
There are several ways to detect Builder.io: (1) View the page source and look for Builder.io-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to Builder.io CDN domains, (3) Use our free tool — we check 5 detection signals automatically.
What websites are built with Builder.io?
Builder.io is used by thousands of websites worldwide. Our scanner has detected many Builder.io-built sites across different industries. You can scan any URL to check if it uses Builder.io.
How accurate is the Builder.io detection?
Our Builder.io detection engine checks 5 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 Builder.io
Builder.io is a leading ai app builder used by thousands of businesses and developers worldwide. Our detection engine can identify Builder.io-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 App Builder
- Signals Used
- 5 patterns
- Accuracy
- High
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