head to head · open source
haystack vs cli-agent-orchestrator
haystack has 26,559 GitHub stars, 3,153 forks, 143 open issues and last shipped yesterday. cli-agent-orchestrator has 1,320 stars, 272 forks, 151 open issues and last shipped yesterday. haystack leads on adoption by 1,912% (26,559 vs 1,320 stars). haystack is written in Python under Apache-2.0; cli-agent-orchestrator is written in Python under Apache-2.0. haystack has attracted 12% as many forks as stars, cli-agent-orchestrator 21%. cli-agent-orchestrator was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (ai-agents), 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
| haystack | cli-agent-orchestrator | |
|---|---|---|
| GitHub stars | ★ 27K | ★ 1.3K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | Python |
| Last push | 2026-09-19 | 2026-09-19 |
| Forks | ⑂ 3.2K | ⑂ 272 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick haystack if
- You weight community size — 27K 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 cli-agent-orchestrator if
- You want the cli-agent-orchestrator feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and cli-agent-orchestrator fits your workflow better
About haystack
Haystack is an open source AI orchestration framework written in Python under the Apache 2.0 licence, for building context engineered, production ready large language model applications as modular pipelines and agent workflows with explicit control over retrieval, routing, memory, and generation, and it is aimed at developers and teams building scalable agents, retrieval augmented generation, multimodal applications, semantic search, question answering, and conversational systems.
read the full haystack overview →
About cli-agent-orchestrator
CLI Agent Orchestrator (CAO) is an Apache 2.0 Python tool that runs a local cao server and coordinates multiple AI coding CLIs, such as Claude Code, Kiro, Codex and Cursor CLI, as supervisor and worker agents inside isolated tmux sessions, and it is aimed at developers and teams who already have at least one of those provider CLIs installed and authenticated and want them working together.
read the full cli-agent-orchestrator overview →
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Frequently asked questions
Is haystack or cli-agent-orchestrator more popular?
haystack has 26,559 GitHub stars and cli-agent-orchestrator has 1,320. haystack has the larger community by that measure.
Are haystack and cli-agent-orchestrator free?
Both are open source. haystack is licensed under Apache-2.0 and cli-agent-orchestrator under Apache-2.0. Neither carries a licence fee.
What is the difference between haystack and cli-agent-orchestrator?
haystack is written in Python and cli-agent-orchestrator in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, haystack or cli-agent-orchestrator?
Choose haystack if you want the larger community (26,559 stars) or its Apache-2.0 licence terms. Choose cli-agent-orchestrator if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.