# Website Tech Stack Detector (Wappalyzer alternative) (`liora-tools/tech-stack-detector`) Actor

Find out what any website is built with: CMS, e-commerce platform, frameworks, analytics, ads, CDN, hosting, payment, marketing and email tools. 7,600+ technology fingerprints with versions and categories. Bulk lists, fast, cheap per website. A BuiltWith or Wappalyzer alternative for lead lists.

- **URL**: https://apify.com/liora-tools/tech-stack-detector.md
- **Developed by:** [Liora Blyth](https://apify.com/liora-tools) (community)
- **Categories:** Lead generation, Developer tools, SEO tools
- **Stats:** 2 total users, 1 monthly users, 100.0% runs succeeded, 0 bookmarks
- **User rating**: No ratings yet

## Pricing

from $1.00 / 1,000 website analyseds

This Actor is paid per event. You are not charged for the Apify platform usage, but only a fixed price for specific events.

Learn more: https://docs.apify.com/actors/running/actors-in-store.md#pay-per-event

## What's an Apify Actor?

An Actor is a serverless cloud program that runs on the Apify platform. It has two run modes.
In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours,
and optionally produces a well-defined JSON output, datasets with results, or files in key-value store.
In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server.

Apify vocabulary and the platform model are defined once, in the agent quickstart at https://apify.com/agents.md.

## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready.

Do not guess an integration path. Every one of them is in the agent quickstart at https://apify.com/agents.md: the Apify MCP server, Agent Skills with the Apify CLI, the JavaScript and Python clients, the REST API, and the account-free path for an agent with no human to sign in. It also carries the rule on stating cost before the first paid run.

For examples already wired to this Actor's own input schema, see the [API](#api) section below.

Each client library has reference documentation the quickstart does not restate: [JavaScript/TypeScript](https://docs.apify.com/api/client/js/docs.md) (`npm install apify-client`) and [Python](https://docs.apify.com/api/client/python/docs.md) (`pip install apify-client`).

# README

## Website Tech Stack Detector: a BuiltWith and Wappalyzer alternative for bulk lists

Find out **what technologies any website uses**: CMS (WordPress, Webflow…), e-commerce platform (Shopify,
WooCommerce, Magento…), JavaScript frameworks (React, Next.js, Vue…), analytics and tag managers, advertising
pixels, CDN and hosting, payment providers, marketing automation, chat widgets, and **email providers from DNS**
(Google Workspace, Microsoft 365…).

Detection uses **7,600+ open-source technology fingerprints** with version numbers and categories, run against
HTTP headers, cookies, HTML, scripts, meta tags and DNS records. Paste 10 or 100,000 domains and get one clean
row per website.

### Quick start

1. Paste domains or URLs into **URLs** (one per line, any format: `example.com`, `https://www.example.com/pricing`).
2. Optionally filter for the technologies you care about (`technologies` + `onlyMatching`) to build lead lists.
3. Click **Start** and export to CSV/Excel/JSON, or call the Actor through the Apify API, Zapier, Make or n8n.

### Use cases

- **Lead generation and sales prospecting:** "all Shopify stores using Klaviyo", "WordPress sites without Google Analytics"
- **Competitor research:** see the stack, tools and vendors of competing websites
- **Market research:** technology adoption across an industry list
- **Agencies:** qualify prospects before outreach (outdated CMS, no tracking, slow stack)

### Input

```json
{
  "urls": ["allbirds.com", "https://wordpress.org/news/", "vercel.com"],
  "checkDns": true,
  "minConfidence": 0
}
```

### New options (v0.2)

| Option | What it does |
|---|---|
| `technologies` + `onlyMatching` | Build lead lists: keep only sites using e.g. Shopify, HubSpot or Stripe (others are free) |
| `categories` | Keep only Analytics, Ecommerce, CMS, Payment, ... technologies |
| `maxPagesPerDomain` (1-5) | Also scan pricing / shop / blog pages for tools that only load there; same price per site |
| `trackChanges`, `stateKey` | `addedTechnologies` / `removedTechnologies` since the last run (competitor monitoring) |

Versions are reported when the page exposes them (`version`). Not included on purpose: headless-browser rendering (keeps cost low) and any bot-protection bypass.

### Output (one item per website)

```json
{
  "url": "https://www.allbirds.com", "status": "ok", "statusCode": 200, "title": "Allbirds…",
  "technologyCount": 10,
  "technologyNames": ["Cloudflare", "Shopify", "Swiper", "Apple Pay", "PayPal", "Google Tag Manager", "…"],
  "byCategory": {"Ecommerce": ["Shopify"], "CDN": ["Cloudflare"], "Payment processors": ["Apple Pay", "PayPal"], "Tag managers": ["Google Tag Manager"]},
  "technologies": [{"name": "WordPress", "version": "7.2", "categories": ["CMS", "Blogs"], "confidence": 100, "implied": false, "website": "https://wordpress.org"}]
}
```

### Pricing (pay per event)

| Event | Price |
|---|---|
| Analyzed website (`website`) | **$0.001** ($1 per 1,000 sites) |
| Actor start | $0.00005 (Apify default) |

- Failed or unreachable websites are **free**; with `onlyMatching`, sites that don't match are free too.
- Scanning extra pages per domain (`maxPagesPerDomain`) does not change the price.
- Examples: 1,000 domains ≈ $1; 50,000 domains ≈ $50.
- Set **Maximum cost per run** to cap spend; the Actor stops cleanly at the cap.

### How it works and its limits

- One HTTP request per website plus DNS lookups. No headless browser, so it is fast and cheap.
- Technologies that only appear after JavaScript runs (some single-page-app tools) may be missed. Server-side,
  HTML, script and DNS-based detections are covered.
- robots.txt is respected by default. No captcha or anti-bot bypass.
- Fingerprints: [webappanalyzer](https://github.com/enthec/webappanalyzer) (GPL-3.0), an open-source fork of the
  Wappalyzer rules. Not affiliated with Wappalyzer or BuiltWith.

### FAQ

**Is this the same as Wappalyzer or BuiltWith?** It uses an open-source fork of the Wappalyzer fingerprints, run
live against each site. BuiltWith also has historical data; this Actor reports what the site uses right now
(plus changes since your last run with `trackChanges`).

**Why is a technology missing?** It may only load after JavaScript runs, after login, or on a page not scanned.
Try `maxPagesPerDomain: 3`.

**Do I need proxies?** No. Sites behind aggressive bot protection may return an error row (free).

**Can I monitor competitors?** Yes: schedule the Actor with `trackChanges: true` and a fixed `stateKey` to get
`addedTechnologies` / `removedTechnologies` on every run.

# Actor input Schema

## `urls` (type: `array`):

Homepages or domains to analyze (https:// is added automatically).

## `checkDns` (type: `boolean`):

Also detect email, DNS and verification providers from MX/TXT/NS records (Google Workspace, Microsoft 365, Cloudflare DNS…).

## `minConfidence` (type: `integer`):

Hide detections below this confidence.

## `categories` (type: `array`):

Keep only technologies in these categories, e.g. Ecommerce, Analytics, CMS, Payment processors, JavaScript frameworks, Marketing automation.

## `technologies` (type: `array`):

Technology names to look for, e.g. Shopify, HubSpot, Stripe. Results get matchedTechnologies.

## `onlyMatching` (type: `boolean`):

Lead lists: sites without any of the technologies above are not saved and not charged.

## `maxPagesPerDomain` (type: `integer`):

1 = homepage only (fastest). Up to 5 also scans internal pages such as pricing, blog or shop to find tools that only load there. Same price per website.

## `trackChanges` (type: `boolean`):

Adds addedTechnologies / removedTechnologies compared to the last run with the same state key.

## `stateKey` (type: `string`):

Name of the memory used by change tracking.

## `respectRobotsTxt` (type: `boolean`):

Skip sites whose robots.txt disallows the homepage (free).

## `maxConcurrency` (type: `integer`):

How many websites are analyzed at the same time.

## Actor input object example

```json
{
  "urls": [
    "allbirds.com",
    "wordpress.org/news/",
    "vercel.com"
  ],
  "checkDns": true,
  "minConfidence": 0,
  "categories": [],
  "technologies": [],
  "onlyMatching": false,
  "maxPagesPerDomain": 1,
  "trackChanges": false,
  "stateKey": "default",
  "respectRobotsTxt": true,
  "maxConcurrency": 10
}
```

# Actor output Schema

## `results` (type: `string`):

Detected technologies per website analysed by this run (one dataset item each).

# API

You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup.

## JavaScript example

```javascript
import { ApifyClient } from 'apify-client';

// Initialize the ApifyClient with your Apify API token
// Replace the '<YOUR_API_TOKEN>' with your token
const client = new ApifyClient({
    token: '<YOUR_API_TOKEN>',
});

// Prepare Actor input
const input = {
    "urls": [
        "allbirds.com",
        "wordpress.org/news/",
        "vercel.com"
    ]
};

// Run the Actor and wait for it to finish
const run = await client.actor("liora-tools/tech-stack-detector").call(input);

// Fetch and print Actor results from the run's dataset (if any)
console.log('Results from dataset');
console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);
const { items } = await client.dataset(run.defaultDatasetId).listItems();
items.forEach((item) => {
    console.dir(item);
});

// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs

```

## Python example

```python
from apify_client import ApifyClient

# Initialize the ApifyClient with your Apify API token
# Replace '<YOUR_API_TOKEN>' with your token.
client = ApifyClient("<YOUR_API_TOKEN>")

# Prepare the Actor input
run_input = { "urls": [
        "allbirds.com",
        "wordpress.org/news/",
        "vercel.com",
    ] }

# Run the Actor and wait for it to finish
run = client.actor("liora-tools/tech-stack-detector").call(run_input=run_input)

# Fetch and print Actor results from the run's dataset (if there are any)
print(f"💾 Check your data here: https://console.apify.com/storage/datasets/{run.default_dataset_id}")
for item in client.dataset(run.default_dataset_id).iterate_items():
    print(item)

# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

```

## CLI example

```bash
echo '{
  "urls": [
    "allbirds.com",
    "wordpress.org/news/",
    "vercel.com"
  ]
}' |
apify call liora-tools/tech-stack-detector --silent --output-dataset

```

## MCP server setup

```json
{
    "mcpServers": {
        "apify": {
            "type": "http",
            "url": "https://mcp.apify.com/?tools=fetch-actor-details,liora-tools/tech-stack-detector"
        }
    }
}
```

The hosted server signs you in with OAuth on first connect, so no API token belongs in this config. Clients without OAuth support can send an `Authorization: Bearer <APIFY_API_TOKEN>` header instead, using a token from API & Integrations in Apify Console (https://console.apify.com/settings/integrations).

## OpenAPI specification

Download the OpenAPI definition: https://api.apify.com/v2/actors/F3CzdhaY3hN8KNDJ5/builds/fcLNwUMEjVW08el4E/openapi.json