head to head · open source
Onyx vs atmos
Onyx has 32,149 GitHub stars, 4,478 forks, 451 open issues and last shipped today. atmos has 1,379 stars, 175 forks, 289 open issues and last shipped today. Onyx leads on adoption by 2,231% (32,149 vs 1,379 stars). Onyx is written in Python under a custom or non-standard licence; atmos is written in Go under Apache-2.0. Onyx has attracted 14% as many forks as stars, atmos 13%. atmos 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
| Onyx | atmos | |
|---|---|---|
| GitHub stars | ★ 32K | ★ 1.4K |
| License | Custom / other | Apache-2.0 |
| Written in | Python | Go |
| Last push | 2026-09-18 | 2026-09-18 |
| Forks | ⑂ 4.5K | ⑂ 175 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Onyx if
- You weight community size — 32K stars and counting
- You want the Custom / other license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick atmos if
- You want the atmos 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 atmos fits your workflow better
About Onyx
Onyx is an open source AI application layer that gives teams a self hostable chat interface with retrieval augmented generation over their own company data and more than 50 indexing connectors.
About atmos
Atmos is the open source runtime for infrastructure — a Go based, Apache 2.0 licensed CLI that builds, authenticates, and ships Terraform, OpenTofu, Packer, Ansible, Kubernetes, Helm, and containers the same way on a laptop, in CI, and with AI agents, and it is aimed at the platform and DevOps teams who model cloud environments as declarative stacks and components.
read the full atmos overview →
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Frequently asked questions
Is Onyx or atmos more popular?
Onyx has 32,149 GitHub stars and atmos has 1,379. Onyx has the larger community by that measure.
Are Onyx and atmos free?
Both are open source. Onyx has no licence declared in this registry, and atmos is licensed under Apache-2.0. Both are free to self-host.
What is the difference between Onyx and atmos?
Onyx is written in Python and atmos 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, Onyx or atmos?
Choose Onyx if you want the larger community (32,149 stars) or its Custom / other licence terms. Choose atmos if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.