Free tools / Website technology checker
Free website technology checker: what is this site built with?
Detect the technologies a public website uses: CMS or site builder, JavaScript framework, CDN and hosting, web server, analytics and tag managers, each with its evidence and a confidence level.
The result appears here as JSON.One free check per tool and IP address per day. Nothing is stored.
What you get
- CMS or site builder, framework, CDN and hosting, web server
- Analytics, tag managers, payments and consent tools
- The evidence for each detection (header, meta tag, script URL) and a confidence level
Not returned: Anything behind a login, and technologies that leave no trace in the page the server returns.
Use it from code or an agent
curl "https://api.ambolt.dev/v1/tech-stack-lookup?url=https%3A%2F%2Fwww.sitemaps.org%2F&free=1"Same tool as an MCP tool (tech_stack_lookup, free at 30 requests a minute), as a pay-per-call endpoint ($0.005 a call in USDC) and as an Apify Actor. Reference · Docs
Questions
How does it detect technologies?
It reads one page and looks for headers, meta tags, script URLs and page markers.
Is it always right?
No. Each result shows its evidence and a confidence level so you can judge.
Does it respect robots.txt?
Yes. It reads one page and respects robots.txt.