wtracer

Web Techs Tracer. CLI tool that detects technologies used on websites. Uses Playwright to render pages and Wappalyzer patterns for detection.

Installation

Requires Python 3.13+.

# Clone and install
git clone <repo-url>
cd wtracer
uv sync

# Install Playwright browser
playwright install chromium

Usage

# Single URL
uv run wtracer detect https://example.com

# Multiple URLs
uv run wtracer detect https://example.com https://wordpress.org

# From file (one URL per line, # comments supported)
uv run wtracer detect -i urls.txt

# JSON output
uv run wtracer detect https://example.com -f json

Flags

Flag	Default	Description
-f, --format	text	Output format: json or text
-c, --confidence	90	Minimum confidence (0-100). Lower = more results, more false positives
-t, --timeout	30000	Page load timeout in ms
--headless/--no-headless	true	Run browser with or without visible window
--show-implied/--no-implied	true	Show implied technologies (e.g. WordPress implies PHP)
-u, --user-agent	default	Custom User-Agent string
-o, --output	stdout	Save output to file
-d, --data-path	data/technologies	Path to Wappalyzer JSON files

Other commands

# List all technology categories
uv run wtracer categories

# Show version
uv run wtracer --version

Detection methods

The tool matches patterns across multiple sources:

• html — HTML tags and attributes
• scriptSrc — Script source URLs
• js — JavaScript global variables (window.*)
• headers — HTTP response headers
• meta — Meta tag content
• dom — DOM element selectors
• cookies — Cookie names
• url — Page URL patterns
• xhr — XHR/fetch request URLs
• implies — Inferred dependencies (e.g. jQuery implies JavaScript)

Tips

• Use --confidence 95 or higher to reduce false positives on smaller sites
• Some sites block headless browsers — try --no-headless if you get timeouts
• Increase --timeout for slow-loading pages