head to head · open source
witr vs calico
witr has 22,918 GitHub stars, 810 forks, 17 open issues and last shipped 13 days ago. calico has 7,410 stars, 1,620 forks, 279 open issues and last shipped yesterday. witr leads on adoption by 209% (22,918 vs 7,410 stars). witr is written in Go under Apache-2.0; calico is written in Go under Apache-2.0. witr has attracted 4% 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 | ★ 23K | ★ 7.4K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Go | Go |
| Last push | 2026-10-23 | 2026-11-04 |
| Forks | ⑂ 810 | ⑂ 1.6K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick witr if
- You weight community size — 23K 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 Why is this running? Trace any process, port, container, or file back to the exact chain that started it — one command, machine readable JSON, or an interactive TUI. 🎮 Try witr in your browser → Investigate a simulated Linux box — a guided tutorial and free play sandbox, no install required. Purpose • Installation • TUI • Flags • Core Concept • Examples Output Behavior • Platforms • Success Criteria • Sponsors 1. Purpose witr exists to answer a single question: Why is this running? When something is running on a system, whether it is a process, a service, or something bound to a port, there is always a…
About calico
Calico Quickstart Docs Contribute Slack Releases 🐾 Welcome to Project Calico! Project Calico, created and maintained by [Tigera][tigera], is an open source project with an active development and user community. Calico Open Source has grown to be the most widely adopted solution for container networking and security, powering 8M+ nodes daily across 166 countries. 🌟 Why use Calico? Data Plane Choice : eBPF, standard Linux, Windows, and VPP — versatility in network solutions. Interoperability : Works across multiple distros, multiple clouds, bare metal, and VMs. Optimized Performance : Engineered for high speed…
read the full calico overview →
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Frequently asked questions
Is witr or calico more popular?
witr has 22,918 GitHub stars and calico has 7,410. 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 (22,918 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.