Colly

Fast and elegant scraping framework for Go – high-performance concurrent crawling with a clean callback-based API.

By Nathan KesslerUpdated May 8, 2026

Each tool is evaluated against our methodology using public docs, vendor demos, and hands-on testing.

Open source scraping frameworks give engineering teams full control over their web data pipeline. You choose where to deploy, how to scale, and what data to collect – with no vendor lock-in or per-request pricing. The trade-off is infrastructure maintenance and anti-bot engineering, which commercial APIs handle for you.

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Features

—JS Rendering

✓Structured Output

✓Open Source

✓Self-Hosted Option

Pricing:Free

Editorial assessment

The best scraping framework for Go developers. Concurrent crawling with goroutines delivers exceptional performance for high-volume static page scraping. Go's smaller web scraping community means fewer examples and plugins than Scrapy. No JS rendering support – you need to pair with a headless browser for modern SPAs. Niche but excellent.

How Colly compares

Scrapy

Scrapy has a much larger ecosystem and community, but in Python rather than Go.

Crawlee

Crawlee offers similar modern architecture with built-in JS rendering, but in TypeScript.

Crawl4AI

Crawl4AI is AI-native and Python-based, better for LLM-focused scraping pipelines.

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