Astro is a modern web framework that pioneered the 'islands architecture' — shipping zero JavaScript by default and hydrating only the interactive components that need it, resulting in extremely fast initial page loads. Unlike traditional React or Vue frameworks, Astro components compile to pure HTML at build time, and interactive widgets (React, Vue, Svelte, or Solid components) are loaded as isolated islands when needed. It's the framework of choice for documentation sites, blogs, marketing pages, and any content-focused site where performance is paramount. Astro sites are identifiable through the astro-island custom element wrapping client-side interactive components, assets served from the _astro/ directory path with content-hash filenames, and the astro-island attribute in the DOM. The framework produces minimal JavaScript payloads, which makes Astro sites score exceptionally high on Core Web Vitals.
Detect Astro Websites — Free Tool
Enter any URL to check if it was built with Astro. Instant results, no account required.
How to Detect Astro Websites
Script Patterns
2 patterns
HTML Patterns
3 patterns
HTTP Headers
1 patterns
1. Check the Page Source
Open the website in your browser, right-click, and select "View Page Source". Search for astro-specific patterns in the HTML.
2. Look for Script Files
Check the Network tab in DevTools for JavaScript files loaded from Astro domains.
4. 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 Astro?
You can detect if any website was built with Astro 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 Astro was used — with a confidence score.
How to detect if a website was built with Astro?
There are several ways to detect Astro: (1) View the page source and look for Astro-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to Astro CDN domains, (3) Use our free tool — we check 6 detection signals automatically.
What websites are built with Astro?
Astro is used by thousands of websites worldwide. Our scanner has detected many Astro-built sites across different industries. You can scan any URL to check if it uses Astro.
How accurate is the Astro detection?
Our Astro detection engine checks 6 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 Astro
Astro is a leading ai coding tool used by thousands of businesses and developers worldwide. Our detection engine can identify Astro-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 Coding Tool
- Signals Used
- 6 patterns
- Accuracy
- High
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