head to head · open source
witr vs calico
witr has 22,404 GitHub stars, 783 forks, 17 open issues and last shipped 1 months ago. calico has 7,363 stars, 1,607 forks, 279 open issues and last shipped today. witr leads on adoption by 204% (22,404 vs 7,363 stars). witr is written in Go under Apache-2.0; calico is written in Go under Apache-2.0. witr has attracted 3% as many forks as stars, calico 22%. calico was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (kubernetes), 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
| witr | calico | |
|---|---|---|
| GitHub stars | ★ 22K | ★ 7.4K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Go | Go |
| Last push | 2026-08-15 | 2026-09-20 |
| Forks | ⑂ 783 | ⑂ 1.6K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick witr if
- You weight community size — 22K 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 calico if
- You want the calico 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 calico fits your workflow better
About witr
witr is an open source, Apache 2.0 licensed Go tool with both a command line interface and an interactive terminal UI that traces any process, port, container, or file back to the exact chain of systems that started it, and it is built for operators, SREs, and developers who need to answer "why is this running?" during debugging and incident response.
About calico
Calico is an open source, Apache 2.0 licensed cloud native networking and network security project for Kubernetes clusters, maintained by Tigera and aimed at platform engineers, cluster operators and network teams who need container networking, network policy enforcement and encryption across on premises, cloud and bare metal environments.
read the full calico overview →
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Frequently asked questions
Is witr or calico more popular?
witr has 22,404 GitHub stars and calico has 7,363. witr has the larger community by that measure.
Are witr and calico free?
Both are open source. witr is licensed under Apache-2.0 and calico under Apache-2.0. Neither carries a licence fee.
What is the difference between witr and calico?
witr is written in Go and calico 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, witr or calico?
Choose witr if you want the larger community (22,404 stars) or its Apache-2.0 licence terms. Choose calico if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.