head to head · open source
changedetection.io vs colly
changedetection.io has 35,461 GitHub stars, 2,194 forks, 385 open issues and last shipped yesterday. colly has 25,572 stars, 1,859 forks, 195 open issues and last shipped 18 days ago. changedetection.io leads on adoption by 39% (35,461 vs 25,572 stars). changedetection.io is written in Python under Apache-2.0; colly is written in Go under Apache-2.0. changedetection.io has attracted 6% as many forks as stars, colly 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 | colly | |
|---|---|---|
| GitHub stars | ★ 35K | ★ 26K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | Go |
| Last push | 2026-11-02 | 2026-10-16 |
| Forks | ⑂ 2.2K | ⑂ 1.9K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick changedetection.io if
- You weight community size — 35K 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 colly if
- You want the colly feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Go
- You evaluated both and colly fits your workflow better
About changedetection.io
Detect Website Changes Automatically — Monitor Web Page Changes in Real Time Monitor websites for updates — get notified via Discord, Email, Slack, Telegram, Webhook and many more. Detect web page content changes and get instant alerts. Ideal for monitoring price changes, content edits, conditional changes and more. [![Release Version][release shield]][release link] [![Docker Pulls][docker pulls]][docker link] [![License][license shield]](LICENSE.md) Get started with website page change monitoring straight away. Don't have time? Try our $8.99/month subscription, use our proxies and support! , half the price of…
read the full changedetection.io overview →
About colly
Colly Lightning Fast and Elegant Scraping Framework for Gophers Colly provides a clean interface to write any kind of crawler/scraper/spider. With Colly you can easily extract structured data from websites, which can be used for a wide range of applications, like data mining, data processing or archiving. Sponsors NodeMaven: The most efficient proxy provider for Web Scrapping and Automation with the Highest Quality IP on the market. Why NodeMaven? 99.9% uptime ZIP Targeting IP filtering: all proxies have fraud score 1k request/sec on a single core) Manages request delays and maximum concurrency per domain…
read the full colly overview →
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Frequently asked questions
Is changedetection.io or colly more popular?
changedetection.io has 35,461 GitHub stars and colly has 25,572. changedetection.io has the larger community by that measure.
Are changedetection.io and colly free?
Both are open source. changedetection.io is licensed under Apache-2.0 and colly under Apache-2.0. Neither carries a licence fee.
What is the difference between changedetection.io and colly?
changedetection.io is written in Python and colly 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 colly?
Choose changedetection.io if you want the larger community (35,461 stars) or its Apache-2.0 licence terms. Choose colly if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.