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gocolly/colly

Colly is a high-performance web scraping framework for Go that provides a comprehensive toolkit for building robust crawlers. It supports advanced features such as parallel and asynchronous scraping, request queuing, and rate limiting to manage concurrency and avoid overwhelming target servers. The system includes built-in extensions for user-agent rotation, URL filtering, and proxy switching, alongside a CLI for rapid project scaffolding. Additionally, it offers debugging tools and in-memory storage to facilitate development and maintenance.

64.3

Adequate · 6 August 2026

5k

lines of production code

Go

primary language

3

bus factor · 138 authors in all

4

measurements over time

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How it got here

2017 · API expansion and example library growth

This period focused on expanding the Colly framework with new features such as HTTP tracing, proxy rotation, and a CLI code generator, alongside a significant addition of diverse web scraping examples. The release of version 2.1.0 introduced functional options for configuration and enhanced debugging capabilities, while removing outdated examples to streamline the codebase.

19 changes

2018–2019 · Concurrency and extension features

This period focused on enhancing Colly's capabilities for concurrent crawling and request management by introducing a request queue and in-memory storage backend. The team also expanded the library's utility with an extensions package for common scraping tasks and provided new examples demonstrating these features.

8 changes

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About this page

  • The description of this project is derived from its own commit history, not from its README.
  • The score is its highest published measurement, taken on 6 August 2026 at a pinned commit. It is not a live figure and does not change until the project is measured again.
  • Measured at commit 20d31482af — the exact code this score is about.
  • Scored under rubric rubric-2026.08.19. Score the same commit under that rubric and you get the same number.
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