qcrawl 0.3.3

Fast async web crawler & scraping framework, supporting deduplication, and extensible middleware.

qcrawl is a fast async web crawling & scraping framework for Python to extract structured data from web-pages. It is cross-platform and easy to install via pip, conda, or OS packages.

Follow the documentation.

Libraries comparison

Attribute	qCrawl ⭐	Scrapy	Playwright	Colly
Language	Python	Python	Node.js, Python, Java	Go
Concurrency model	Asyncio native with threads for I/O work	Evented (Twisted) with non‑blocking I/O	Isolated contexts within browser instance + multiple browser instances	Goroutines (lightweight threads)
Queue	Priority queue with FIFO tiebreak, memory, [disk,] redis backends	Priority queue with FIFO/LIFO tiebreak, memory and disk backends	No built-in crawl queue (user-managed)	FIFO with memory and file backends
Middleware & hooks	Downloader + Spider middlewares; signal-driven lifecycle hooks	Downloader + Spider middlewares; signal-driven lifecycle hooks	Hooks and interception API; not pipeline-centric	Middleware-style callbacks
Crawl throttling	Per-domain concurrency with configurable delay	Per-domain concurrency with configurable delay	Controlled via browser sessions	Per-host concurrency
Strengths	Lightweight, high-throughput, easy to extend	Very mature ecosystem and community, easy to extend	Real browser rendering, JS support, robust for SPA sites	Extremely high throughput, low memory use