Svelte is a compiler-based JavaScript framework that converts component code into highly optimized vanilla JavaScript at build time, rather than shipping a runtime framework to the browser — appealing to developers who prioritize small bundle sizes and raw performance. Our engine detects Svelte through 2 script patterns and 2 HTML patterns tied to its compiled output conventions, though because Svelte's compilation removes much of the framework's own signature, detection confidence benefits from corroborating signals like SvelteKit-specific routing artifacts when present. Svelte is an open-source compiler, not a hosting platform. Documented at svelte.dev.
Detect Svelte Websites — Free Tool
Enter any URL to check if it was built with Svelte. Instant results, no account required.
How we detect Svelte — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How to Detect Svelte Websites
Script Patterns
2 patterns
HTML Patterns
2 patterns
1. Check the Page Source
Open the website in your browser, right-click, and select "View Page Source". Search for svelte-specific patterns in the HTML.
2. Look for Script Files
Check the Network tab in DevTools for JavaScript files loaded from Svelte 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 Svelte?
You can detect if any website was built with Svelte 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 Svelte was used — with a confidence score.
How to detect if a website was built with Svelte?
There are several ways to detect Svelte: (1) View the page source and look for Svelte-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to Svelte CDN domains, (3) Use our free tool — we check 4 detection signals automatically.
What websites are built with Svelte?
Svelte is used by thousands of websites worldwide. Our scanner has detected many Svelte-built sites across different industries. You can scan any URL to check if it uses Svelte.
How accurate is the Svelte detection?
Our Svelte detection engine checks 4 unique fingerprint signals, achieving high confidence results. We score each match and return a confidence percentage so you know how certain the detection is.
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Detection Info
- Category
- JavaScript Framework
- Signals Used
- 4 patterns
- Accuracy
- High
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