head to head · open source
haystack vs oh-my-opencode-slim
haystack has 26,559 GitHub stars, 3,153 forks, 143 open issues and last shipped yesterday. oh-my-opencode-slim has 8,966 stars, 534 forks, 53 open issues and last shipped today. haystack leads on adoption by 196% (26,559 vs 8,966 stars). haystack is written in Python under Apache-2.0; oh-my-opencode-slim is written in TypeScript under MIT. haystack has attracted 12% as many forks as stars, oh-my-opencode-slim 6%. oh-my-opencode-slim was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (agentic-ai), 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 | oh-my-opencode-slim | |
|---|---|---|
| GitHub stars | ★ 27K | ★ 9.0K |
| License | Apache-2.0 | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-09-19 | 2026-09-20 |
| Forks | ⑂ 3.2K | ⑂ 534 |
| 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 oh-my-opencode-slim if
- You want the oh-my-opencode-slim feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and oh-my-opencode-slim 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 oh-my-opencode-slim
oh my opencode slim is an MIT licensed TypeScript agent orchestration plugin for OpenCode that replaces the single model does everything approach with a built in team of seven specialized agents — Orchestrator, Explorer, Oracle, Council, Librarian, Designer, and Fixer — and it is aimed at developers who already use OpenCode and want to mix models across providers while delegating scoped work automatically.
read the full oh-my-opencode-slim overview →
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Frequently asked questions
Is haystack or oh-my-opencode-slim more popular?
haystack has 26,559 GitHub stars and oh-my-opencode-slim has 8,966. haystack has the larger community by that measure.
Are haystack and oh-my-opencode-slim free?
Both are open source. haystack is licensed under Apache-2.0 and oh-my-opencode-slim under MIT. Neither carries a licence fee.
What is the difference between haystack and oh-my-opencode-slim?
haystack is written in Python and oh-my-opencode-slim in TypeScript. 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 oh-my-opencode-slim?
Choose haystack if you want the larger community (26,559 stars) or its Apache-2.0 licence terms. Choose oh-my-opencode-slim if its feature set, stack or MIT licence fits better. Both are self-hostable.