Site123 is a Website Builder that powers thousands of websites. Our detection engine uses multiple signals to identify Site123-built sites with high accuracy.
Detect Site123 Websites — Free Tool
Enter any URL to check if it was built with Site123. Instant results, no account required.
How we detect Site123 — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How to Detect Site123 Websites
CDN Domains
1 patterns
HTML Patterns
1 patterns
1. Check the Page Source
Open the website in your browser, right-click, and select "View Page Source". Search for site123-specific patterns in the HTML.
3. Check CDN Domains
Network requests to these CDN domains indicate a Site123 site:
s123-cdn-static\.com4. 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 Site123?
You can detect if any website was built with Site123 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 Site123 was used — with a confidence score.
How to detect if a website was built with Site123?
There are several ways to detect Site123: (1) View the page source and look for Site123-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to Site123 CDN domains, (3) Use our free tool — we check 2 detection signals automatically.
What websites are built with Site123?
Site123 is used by thousands of websites worldwide. Our scanner has detected many Site123-built sites across different industries. You can scan any URL to check if it uses Site123.
How accurate is the Site123 detection?
Our Site123 detection engine checks 2 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
- Website Builder
- Signals Used
- 2 patterns
- Accuracy
- High
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