Tech Stack Detector — website technology detector & tech stack scanner

Find out what any website is built with. Tech Stack Detector scans a list of URLs and identifies the technologies behind each site — CMS, ecommerce platform, web framework, analytics tools, CDN, web server, and more — using the open-source webappanalyzer fingerprint dataset: 7,500+ technologies across 109 categories, regularly refreshed.

A fast, affordable Wappalyzer alternative and BuiltWith alternative: roughly $5 per 1,000 sites, compared to $70–100 per 1,000 lookups with typical commercial tools.

Use with AI agents (MCP)

This Actor is also an MCP tool — AI agents like Claude and Cursor can run it for you. Your agent can call this tool directly; usage bills through your Apify account.

MCP server URL:

https://mcp.apify.com?tools=apifmcpfactory/tech-stack-detector

Claude Desktop (claude_desktop_config.json):

{
    "mcpServers": {
        "tech-stack-detector": {
            "command": "npx",
            "args": [
                "mcp-remote",
                "https://mcp.apify.com?tools=apifmcpfactory/tech-stack-detector",
                "--header",
                "Authorization: Bearer YOUR_APIFY_TOKEN"
            ]
        }
    }
}

Cursor (.cursor/mcp.json):

{
    "mcpServers": {
        "tech-stack-detector": {
            "url": "https://mcp.apify.com?tools=apifmcpfactory/tech-stack-detector",
            "headers": {
                "Authorization": "Bearer YOUR_APIFY_TOKEN"
            }
        }
    }
}

Replace YOUR_APIFY_TOKEN with your API token from Apify Console.

No Apify account? AI agents can also pay per call with USDC via the x402 protocol: buy a prepaid token at agi.apify.com and use it as the Bearer token above.

Who is it for?

• Lead generation & sales prospecting — build lists of sites running Shopify, WordPress, HubSpot, or any other platform your product targets. Qualify leads by their stack before you reach out.
• SEO & competitor research — see what CMS, frameworks, analytics, and marketing tools competitors use, including version numbers where detectable.

Why this Actor?

• Bulk input — paste a list of URLs; each site is fetched and analyzed in parallel.
• Fast & lightweight — plain HTTP fetching with no headless browser, so runs are quick and compute costs stay tiny.
• Rich output — every detected technology comes with human-readable categories, a version number when the fingerprints reveal one, and a confidence score (0–100).
• Resilient — unreachable sites don't break the run; they produce an item with an error field so you always get one row per input URL.
• Self-contained — all fingerprint matching happens locally against the bundled dataset. No third-party API calls.

Input

{
    "urls": [
        "https://www.shopify.com",
        "https://wordpress.org"
    ],
    "maxConcurrency": 10
}

Output

One dataset item per site:

{
    "url": "https://wordpress.org",
    "finalUrl": "https://wordpress.org/",
    "httpStatus": 200,
    "pageTitle": "Blog Tool, Publishing Platform, and CMS – WordPress.org",
    "headers": {
        "server": "nginx",
        "x-powered-by": null,
        "x-generator": null
    },
    "metaGenerator": "WordPress 7.1",
    "technologies": [
        { "name": "WordPress", "categories": ["CMS", "Blogs"], "version": "7.1", "confidence": 100 },
        { "name": "Nginx", "categories": ["Web servers", "Reverse proxies"], "version": null, "confidence": 100 },
        { "name": "PHP", "categories": ["Programming languages"], "version": null, "confidence": 100 },
        { "name": "MySQL", "categories": ["Databases"], "version": null, "confidence": 100 },
        { "name": "Google Tag Manager", "categories": ["Tag managers"], "version": null, "confidence": 100 }
    ],
    "fetchTimeMs": 1259
}

If a site can't be reached, the item contains the url and an error message instead.

How detection works

Each page's response headers, cookies, <meta> tags, HTML content, and script URLs are matched against the community-maintained webappanalyzer fingerprint dataset (the actively maintained successor to Wappalyzer's open-source fingerprints). Relationships between technologies are applied automatically — for example, detecting WooCommerce implies WordPress, which implies PHP and MySQL.

Pricing

Pay per event: a small flat fee per run ($0.001) plus $0.005 per analyzed site — about $5 per 1,000 sites. Compare that to $70–100 per 1,000 lookups elsewhere.

FAQ

Does it render JavaScript? No — that's what keeps it fast and cheap. Technologies only visible after client-side rendering may be missed; server-side signals (headers, HTML, script tags, cookies) are all detected.

How fresh is the fingerprint data? The dataset is bundled with the Actor and refreshed regularly from the open-source webappanalyzer repository.

What counts as a billed site? Every input URL that produces a dataset item, including error items — each one represents real fetch and analysis work.

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