Wappalyzer Alternative — Tech Stack Detector & BuiltWith API

A Wappalyzer alternative and tech stack detector you can call as an API: give it website URLs, get back the technologies each site runs.

Point it at a domain, get the technology stack back. A curated catalog of 251 named technology fingerprints (CMS, analytics, frameworks, payment, hosting, ad-tech — the ones that matter for lead qualification and competitive research), each with the evidence that matched, a version where the site exposes one, and a confidence score. Bulk input, one row per domain analysed — built as a drop-in for teams whose Wappalyzer/BuiltWith plan lapsed.

Developer drop-in: a direct Wappalyzer/BuiltWith replacement for detecting a site's tech stack in code.

📊 Sample Output

url	status_code	tech_count	final_url	tech_names	category_list
https://stripe.com	200	11	https://stripe.com	Content Security Policy, Google Analytics 4, HSTS, Next.js, Nginx, No…	JavaScript Frameworks, Web Servers, Analytics, Databases, Miscellaneo…
https://shopify.com	200	3	https://www.shopify.com/	Cloudflare, HSTS, HTTP/3	CDN, Miscellaneous, Security

Real rows from run UcbdwC3aS1JbijpKf on build 0.0.24 (2026-09-24), unedited apart from masked emails/phones and shortened long text; fields the source does not publish are empty.

⚙️ Sample inputs

This is the Store example input — the same input Apify's automated check runs — so it is proven to return rows on the current build. Paste it into the input form, or send it through the API, CLI or a schedule:

{
  "urls": [
    "https://stripe.com",
    "https://shopify.com"
  ],
  "include_confidence": true,
  "include_versions": true,
  "timeout_seconds": 15
}

🔧 Input reference

Field	Type	Default	What it does
urls	['array', 'string']	["https://stripe.com", "https://shopify.com"]	One or more website URLs to detect tech stack on. Accepts bare hosts ('example.com') or full URLs ('https://example.com/path') — scheme is auto-added if missing. Also accepted und…
categories_filter	array	[]	Optional: only return technologies whose category is in this list. Examples: 'CMS', 'Analytics', 'CDN', 'Ecommerce', 'JavaScript Frameworks', 'Payment Processors'. Leave empty to…
include_confidence	boolean	true	When true, each detected technology includes a 0–100 confidence score. Header matches score 100, script-src matches 90, HTML-body matches 85, implied-only techs score 60.
include_versions	boolean	true	When true, attempts to parse semantic version numbers out of matched headers, script URLs, and HTML. Example: '/react@18.2.0/' ⇒ version '18.2.0'. Version is null when no reliable…
timeout_seconds	integer	15	Per-URL HTTP request timeout. Range 3–60. Increase for slow sites or if you are analyzing heavy pages that need longer download time.
startUrls	array	[]	Alias of urls. Accepts plain URL strings or {url: ...} dict items.
domains	array	[]	Alias of urls. Bare hostnames work too — scheme is auto-added.
websites	array	[]	Alias of urls.
targetUrls	array	[]	Alias of urls.
url	string	""	Alternative — a single URL when you only need one. Comma-separated values are auto-split.

🧾 JSON sample record

One real record from run UcbdwC3aS1JbijpKf (emails/phones masked, long text shortened):

{
  "url": "https://stripe.com",
  "status_code": 200,
  "tech_count": 11,
  "categories": {
    "JavaScript Frameworks": [
      "Next.js",
      "React"
    ],
    "Web Servers": [
      "Nginx"
    ],
    "Analytics": [
      "Google Analytics 4"
    ],
    "Databases": [
      "Supabase"
    ],
    "Miscellaneous": [
      "Open Graph",
      "Schema.org",
      "Twitter Card"
    ],
    "Security": [
      "Content Security Policy",
      "HSTS"
    ],
    "Programming Languages": [
      "Node.js"
    ]
  },
  "technologies": [
    {
      "name": "Content Security Policy",
      "category": "Security",
      "evidence": "header: content-security-policy",
      "version": null,
      "confidence": 100
    },
    {
      "name": "Google Analytics 4",
      "category": "Analytics",
      "evidence": "html: \"accounting-alphaNextToNumber\":\"¤ #,##0.00;(¤ #,##0.",
      "version": null,
      "confidence": 85
    },
    {
      "name": "HSTS",
      "category": "Security",
      "evidence": "header: strict-transport-security",
      "version": null,
      "confidence": 100
    },
    {
      "name": "Next.js",
      "category": "JavaScript Frameworks",
      "evidence": "script: https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/polyfills-42372ed130431b0a.js",
      "version": null,
      "confidence": 90
    },
    {
      "name": "Nginx",
      "category": "Web Servers",
      "evidence": "header: server",
      "version": null,
      "confidence": 100
    },
    {
      "name": "Node.js",
      "category": "Programming Languages",
      "evidence": "implied by Next.js",
      "version": null,
      "confidence": 60
    },
    {
      "name": "Open Graph",
      "category": "Miscellaneous",
      "evidence": "html: p;h=180\"/><meta property=\"og:title\" content=\"Stripe | Finan",
      "version": null,
      "confidence": 85
    },
    {
      "name": "React",
      "category": "JavaScript Frameworks",
      "evidence": "implied by Next.js",
      "version": null,
      "confidence": 60
    },
    "…"
  ],
  "scan_time_ms": 3585,
  "final_url": "https://stripe.com",
  "tech_names": "Content Security Policy, Google Analytics 4, HSTS, Next.js, Nginx, Node.js, Open Graph, React, Schema.org, Supabase, Twitter Card",
  "category_list": "JavaScript Frameworks, Web Servers, Analytics, Databases, Miscellaneous, Security, Programming Languages"
}

💰 Pricing

Event	Price (USD)	When it is charged
Tech stack detection (tech-detection)	$0.1	Full tech stack detection (headers + HTML + script-src) for one domain

Pay-per-event: you pay only for what the run delivers. A run that delivers nothing bills no result events (only the actor-start event, when the actor defines one). Example: a run that delivers 100 results costs 100 × $0.1 = $10.00 plus the start fee.

🔗 Related Actors

More from the NexGenData Leads, contacts & enrichment family:

• Shopify Store Detector — Tech, Theme & App Detection API
• SSL Certificate Checker — Bulk Expiry & Chain Monitor
• TikTok Creator Email Finder — Influencer Contact API
• Website Email Extractor — Bulk Contact Scraper
• Yellow Pages Scraper — Local Business Leads API
• YouTube Creator Contact Finder — Channel Email & Links API

30 more in this family on the NexGenData Store page.

📊 What you get

Clean JSON output (9 fields):

• url — Url
• status_code — Status code
• tech_count — Tech count
• categories — Categories
• technologies — Technologies
• scan_time_ms — Scan time ms
• final_url — Final url
• tech_names — Tech names

Pricing: $0.1 per site (Pay-Per-Event) — about 10 per $1. Live prices are in the Pricing table below.

🤖 Use with AI agents

Point Claude, the OpenAI Agents SDK, an n8n flow or any MCP-aware client at it.

Sample agent prompt:

Run Tech Stack Detector on my input and return the structured results.

Agentic payments (x402): Supports agentic payment via x402 — call this actor with USDC, no API key required.

🔗 Related tools — Tech-stack detection

Website Tech Stack Audit

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A NexGenData utility actor.