Free Website Technology & Tech Stack Checker
Find out what any website is built with — CMS, framework, server, CDN, analytics and more — in one quick lookup.
Ever wondered what powers a website — what framework, CMS, server or CDN it runs on? The siteIQ Tech Stack Checker fingerprints any URL and reveals the technology behind it.
It's perfect for competitor research, vetting a vendor's build, or simply satisfying curiosity. Enter a URL to see the detected stack and infrastructure.
What this tool checks
Framework / CMS
The platform a site is built on (e.g. Next.js, WordPress, Shopify).
Web server
The server software responding to requests.
CDN
Whether a content delivery network is in front of the site.
Analytics & tags
Tracking and tag-management tools detected on the page.
Hosting signals
Infrastructure clues from headers and responses.
Why it matters
Knowing a site's stack is genuinely useful: it informs competitor research, helps you estimate how a site was built and maintained, and reveals performance or security implications of the choices made.
For agencies and founders, it's a fast way to understand the landscape — what your competitors run on, and whether a platform fits the goals before you commit.
How to read your results
- Cross-reference the framework/CMS with the site's speed and security results for a fuller picture.
- A CDN in front of the site usually means better global performance.
- Lots of third-party analytics/tag scripts can be a hidden cause of slow load times.
- Use the findings as a starting point — fingerprinting is informed inference, not a guarantee.
Frequently asked questions
How does it detect the technology?
It analyzes publicly visible signals — HTTP headers, script and asset patterns, and HTML markers — to infer the technologies in use. It's read-only and non-intrusive.
Is the detection always 100% accurate?
It's highly reliable for common platforms, but fingerprinting is inference. Sites can hide or proxy their stack, so treat results as well-informed clues.
Can I check my competitor's website?
Yes — it works on any public URL and is a popular tool for competitor and market research.
Why does the stack matter for performance?
The framework, server, CDN and number of third-party scripts all affect load speed and security. Knowing the stack helps explain the audit results.
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