Website Tech Stack Lookup — Live Detection, $0.001 a Site

Detect the technologies a website runs, from its CMS and framework to analytics, CDN, hosting and ecommerce, read live from the site's homepage with the header, script or tag that gave each one away. AI agents can call and pay for it through Apify's MCP server and agentic payments. It costs $0.001 per site analyzed, and a site that fails is never charged.

Example result

Example record for the minimal input under How to use it, as this Actor returned it on 2026-10-27 in a run of its production image; the record is kept unchanged with the release.

{
  "url": "https://docs.apify.com/",
  "ok": true,
  "finalUrl": "https://docs.apify.com/",
  "names": [
    "Amazon CloudFront",
    "Amazon Web Services",
    "Docusaurus",
    "Fastly",
    "GitHub Pages",
    "Google Tag Manager",
    "HSTS",
    "jsDelivr",
    "Kapa.ai",
    "Nginx",
    "OneTrust",
    "React",
    "Varnish",
    "Webpack"
  ],
  "technologies": [
    {
      "name": "Amazon CloudFront",
      "categories": [
        "CDN"
      ],
      "version": null,
      "confidence": 100,
      "website": "https://aws.amazon.com/cloudfront/",
      "evidence": [
        {
          "type": "header",
          "name": "via",
          "value": "(CloudFront)"
        },
        {
          "type": "header",
          "name": "x-amz-cf-id",
          "value": "WaGmXbhs0KOjeRwj-WEyQnDt1RwRoIC64Zd86nIevZzhV9d1GWcf6Q=="
        }
      ]
    },
    {
      "name": "Amazon Web Services",
      "categories": [
        "PaaS"
      ],
      "version": null,
      "confidence": 100,
      "website": "https://aws.amazon.com/",
      "evidence": [
        {
          "type": "implied",
          "name": "Amazon CloudFront",
          "value": "implied by Amazon CloudFront"
        }
      ]
    },
    {
      "name": "Docusaurus",
      "categories": [
        "Documentation",
        "Static site generator"
      ],
      "version": "3.10.2",
      "confidence": 100,
      "website": "https://docusaurus.io/",
      "evidence": [
        {
          "type": "meta",
          "name": "docusaurus_locale",
          "value": "en"
        },
        {
          "type": "meta",
          "name": "docusaurus_tag",
          "value": "default-latest"
        },
        {
          "type": "meta",
          "name": "generator",
          "value": "Docusaurus v3.10.2"
        }
      ]
    },
    {
      "name": "Fastly",
      "categories": [
        "CDN"
      ],
      "version": null,
      "confidence": 100,
      "website": "https://www.fastly.com",
      "evidence": [
        {
          "type": "header",
          "name": "x-fastly-request-id",
          "value": "beb7105f3898239e3b71bf100b6381e319b82aa7"
        }
      ]
    },
    {
      "name": "GitHub Pages",
      "categories": [
        "PaaS"
      ],
      "version": null,
      "confidence": 100,
      "website": "https://pages.github.com/",
      "evidence": [
        {
          "type": "header",
          "name": "x-github-request-id",
          "value": "AD18:3FCF80:AA6C08:B87D43:6AE12982"
        }
      ]
    },
    {
      "name": "Google Tag Manager",
      "categories": [
        "Tag managers"
      ],
      "version": null,
      "confidence": 100,
      "website": "https://www.google.com/tagmanager",
      "evidence": [
        {
          "type": "html",
          "name": "markup",
          "value": "<!-- Google Tag Manager -->"
        }
      ]
    },
    {
      "name": "HSTS",
      "categories": [
        "Security"
      ],
      "version": null,
      "confidence": 100,
      "website": "https://www.rfc-editor.org/rfc/rfc6797#section-6.1",
      "evidence": [
        {
          "type": "header",
          "name": "strict-transport-security",
          "value": "max-age=31556952"
        }
      ]
    },
    {
      "name": "jsDelivr",
      "categories": [
        "CDN"
      ],
      "version": null,
      "confidence": 100,
      "website": "https://www.jsdelivr.com/",
      "evidence": [
        {
          "type": "script",
          "name": "src",
          "value": "cdn.jsdelivr.net"
        }
      ]
    },
    {
      "name": "Kapa.ai",
      "categories": [
        "Search engines"
      ],
      "version": null,
      "confidence": 100,
      "website": "https://www.kapa.ai",
      "evidence": [
        {
          "type": "script",
          "name": "src",
          "value": "widget.kapa.ai"
        }
      ]
    },
    {
      "name": "Nginx",
      "categories": [
        "Web servers",
        "Reverse proxies"
      ],
      "version": null,
      "confidence": 100,
      "website": "https://nginx.org/en",
      "evidence": [
        {
          "type": "header",
          "name": "server",
          "value": "nginx"
        }
      ]
    },
    {
      "name": "OneTrust",
      "categories": [
        "Cookie compliance"
      ],
      "version": null,
      "confidence": 100,
      "website": "https://www.onetrust.com",
      "evidence": [
        {
          "type": "script",
          "name": "src",
          "value": "cdn.cookielaw.org"
        }
      ]
    },
    {
      "name": "React",
      "categories": [
        "JavaScript frameworks"
      ],
      "version": null,
      "confidence": 100,
      "website": "https://reactjs.org",
      "evidence": [
        {
          "type": "implied",
          "name": "Docusaurus",
          "value": "implied by Docusaurus"
        }
      ]
    },
    {
      "name": "Varnish",
      "categories": [
        "Caching"
      ],
      "version": null,
      "confidence": 100,
      "website": "https://www.varnish-cache.org",
      "evidence": [
        {
          "type": "header",
          "name": "via",
          "value": "varnish"
        }
      ]
    },
    {
      "name": "Webpack",
      "categories": [
        "Miscellaneous"
      ],
      "version": null,
      "confidence": 100,
      "website": "https://webpack.js.org/",
      "evidence": [
        {
          "type": "implied",
          "name": "Docusaurus",
          "value": "implied by Docusaurus"
        }
      ]
    }
  ],
  "categories": [
    "CDN",
    "Caching",
    "Cookie compliance",
    "Documentation",
    "JavaScript frameworks",
    "Miscellaneous",
    "PaaS",
    "Reverse proxies",
    "Search engines",
    "Security",
    "Static site generator",
    "Tag managers",
    "Web servers"
  ]
}

How to use it

Start a run in Apify Console, by API or from an agent with an input like this one — it is the input Apify runs every day to test this Actor:

{"urls": ["https://docs.apify.com/"]}

Field	Type	Meaning
urls	array	Websites to analyze (a homepage or any page); one record each.

Events and prices

Event	Title	Charged when	FREE / BRONZE	SILVER	GOLD / PLATINUM / DIAMOND
site-analyzed	Site analyzed	One page fetched and its technologies returned.	$0.001	$0.0009	$0.0008

Platform usage is not passed through. Apify's automatic actor-start event remains $0.00005 per started GB (one GB or less counts once). The synthetic dataset-item event is absent. Charge limits stop further paying work; unprocessed inputs receive uncharged errors. Completed readable pending events are settled on abort.

Worked cost example: ten successful site analyzed events cost $0.01 at list, plus actor start. Failures are not included in that count.

Call it from an agent

Through Apify's MCP server (https://mcp.apify.com) use call-actor:

{
  "actor": "hermeskd/website-tech-stack",
  "input": {
    "urls": [
      "https://docs.apify.com/"
    ]
  },
  "callOptions": {
    "maxTotalChargeUsd": 0.01,
    "timeout": 600
  },
  "waitSecs": 30
}

Then call get-dataset-items with the returned defaultDatasetId. Dedicated tool URL: https://mcp.apify.com?tools=hermeskd/website-tech-stack

Output fields

Field	Meaning
url	The input URL.
ok	True for a returned result; a failure is never charged.
finalUrl	The URL after redirects.
names	Every technology detected, by name.
technologies	Each technology with its categories, version when shown, and the evidence.
categories	The technology categories present.
error	Failure, always uncharged.

Limits and run time

1–100 URLs a run. One page per site is fetched, up to 5 MB, under the 30-second per-request deadline; detection reads response headers, meta tags, script and link URLs and page markup. Technologies that load only after scripts run may be missed.

The default run timeout is 600 seconds. Typical run time: not yet measured; written from the first deploy.

Errors

Code	Meaning
http_error	The source answered an unsuccessful HTTP status.
download_failed	The request or connection failed within its bounded deadline.
unsupported_content_type	The URL did not return an HTML page.
robots_disallowed	robots.txt forbids fetching the URL; no request was made to it.
blocked_host	The host is on the deny-list or resolves to a private or local address; no request was made.
too_large	The response exceeded the size cap.
timeout	The input did not finish within the run's time budget.
invalid_input	The run input passed the input schema but cannot be used; the message names the field.
internal_error	Unexpected failure; the message carries the error class.
charge_limit_reached	The run reached its maximum total charge; this input was not processed.

No failure record is charged. A run fails only when all input outcomes are Actor-side failures; caller errors and a mixture of caller/Actor failures do not fail the run.

Sources and terms

Only process content you have the right to process. URL fetches obey HermesBot robots-group selection, the shared deny-list, public-address checks on connections and redirects, honest identity, deadlines and rate limits. No caller credentials, cookies, CAPTCHA solving, residential proxies or evasion. Public pages the caller names are fetched under robots.txt; fingerprints from projectdiscovery/wappalyzergo (MIT). No third-party technology index is queried.

Not affiliated

This Actor is not affiliated with Apify or the owners of the sites it reads. Third-party names describe compatibility and source material.

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Changelog

• 1.0 (2026-10-27) — first release.