head to head · open source
colly vs katana
colly has 25,520 GitHub stars, 1,862 forks, 195 open issues and last shipped 2 days ago. katana has 17,518 stars, 1,183 forks, 23 open issues and last shipped 4 days ago. colly leads on adoption by 46% (25,520 vs 17,518 stars). colly is written in Go under Apache-2.0; katana is written in Go under MIT. colly has attracted 7% as many forks as stars, katana 7%. colly was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (crawler), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| colly | katana | |
|---|---|---|
| GitHub stars | ★ 26K | ★ 18K |
| License | Apache-2.0 | MIT |
| Written in | Go | Go |
| Last push | 2026-09-16 | 2026-09-14 |
| Forks | ⑂ 1.9K | ⑂ 1.2K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick colly if
- You weight community size — 26K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick katana if
- You want the katana feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Go
- You evaluated both and katana fits your workflow better
About colly
Colly is an open source scraping and crawling framework written in Go, distributed under the Apache 2.0 license. It lives in the Go ecosystem and is consumed as a library rather than a standalone application: the README describes it as providing a clean interface for writing any kind of crawler, scraper, or spider, and the project's own topics list it as a crawler, crawling framework, scraper, scraping tool, and spider. The repository has been public for roughly nine years, carries 25,516 stars and 1,862 forks, and its most recent push was on 2 September 2026. Documentation and examples are hosted at go colly.org…
read the full colly overview →
About katana
Katana is an open source, MIT licensed crawling and spidering framework written in Go, built for security engineers and automation pipelines that need to map web applications at scale rather than explore them by hand.
read the full katana overview →
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Frequently asked questions
Is colly or katana more popular?
colly has 25,520 GitHub stars and katana has 17,518. colly has the larger community by that measure.
Are colly and katana free?
Both are open source. colly is licensed under Apache-2.0 and katana under MIT. Neither carries a licence fee.
What is the difference between colly and katana?
colly is written in Go and katana in Go. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, colly or katana?
Choose colly if you want the larger community (25,520 stars) or its Apache-2.0 licence terms. Choose katana if its feature set, stack or MIT licence fits better. Both are self-hostable.