head to head · open source
changedetection.io vs katana
changedetection.io has 34,295 GitHub stars, 2,063 forks, 385 open issues and last shipped yesterday. katana has 17,518 stars, 1,183 forks, 23 open issues and last shipped 4 days ago. changedetection.io leads on adoption by 96% (34,295 vs 17,518 stars). changedetection.io is written in Python under Apache-2.0; katana is written in Go under MIT. changedetection.io has attracted 6% as many forks as stars, katana 7%. changedetection.io was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| changedetection.io | katana | |
|---|---|---|
| GitHub stars | ★ 34K | ★ 18K |
| License | Apache-2.0 | MIT |
| Written in | Python | Go |
| Last push | 2026-09-17 | 2026-09-14 |
| Forks | ⑂ 2.1K | ⑂ 1.2K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick changedetection.io if
- You weight community size — 34K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Python
- 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 changedetection.io
changedetection.io is an open source website change detection and web page monitoring tool written in Python and released under the Apache 2.0 license. It watches URLs, detects when their content changes, and sends alerts through channels such as Discord, Email, Slack, Telegram, and Webhook. The project lives in the Data & Analytics / Data Extraction & Web Scraping ecosystem, carries more than 34,000 stars and 2,000 forks on GitHub, and has been developed for roughly six years. It is designed to be self hosted, and the same codebase also backs a hosted subscription service offered by the maintainers.…
read the full changedetection.io 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 changedetection.io or katana more popular?
changedetection.io has 34,295 GitHub stars and katana has 17,518. changedetection.io has the larger community by that measure.
Are changedetection.io and katana free?
Both are open source. changedetection.io is licensed under Apache-2.0 and katana under MIT. Neither carries a licence fee.
What is the difference between changedetection.io and katana?
changedetection.io is written in Python 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, changedetection.io or katana?
Choose changedetection.io if you want the larger community (34,295 stars) or its Apache-2.0 licence terms. Choose katana if its feature set, stack or MIT licence fits better. Both are self-hostable.