head to head · open source
haystack vs lazycodex
haystack has 26,924 GitHub stars, 3,388 forks, 143 open issues and last shipped yesterday. lazycodex has 3,870 stars, 250 forks, 21 open issues and last shipped 2 days ago. haystack leads on adoption by 596% (26,924 vs 3,870 stars). haystack is written in Python under Apache-2.0; lazycodex is written in TypeScript under MIT. haystack has attracted 13% as many forks as stars, lazycodex 6%. haystack was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (ai, 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 | lazycodex | |
|---|---|---|
| GitHub stars | ★ 27K | ★ 3.9K |
| License | Apache-2.0 | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-11-04 | 2026-11-03 |
| Forks | ⑂ 3.4K | ⑂ 250 |
| 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 lazycodex if
- You want the lazycodex feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and lazycodex fits your workflow better
About haystack
🎉🎊✨ Haystack 3.0 is out! ✨🎊🎉 Read the announcement here! 🥳 🎈 🎆 🪅 🎇 🍾 🥂 🎁 🌈 Haystack is an open source AI orchestration framework for building production ready LLM applications in Python. Design modular pipelines and agent workflows with explicit control over retrieval, routing, memory, and generation. Build scalable RAG systems, multimodal applications, semantic search, question answering, and autonomous agents, all in a transparent architecture that lets you experiment, customize deeply, and deploy with confidence. Table of Contents Installation Documentation Features Haystack Enterprise: Support &…
read the full haystack overview →
About lazycodex
LazyCodex The one and only agent harness for complex codebases. Project memory, planning, execution, and verified completion inside Codex. What is this? · OmO · lazycodex.ai [!NOTE] [OmO] 60K Stars: the terrifying token burner has arrived in LazyCodex. Sisyphus Labs' OmO is the quality obsessed agent harness whose public lore says it loved Anthropic models hard enough to get third party clients blocked. Now that same OmO quality bar is available for Codex through LazyCodex. If you wanted OmO but did not want the setup ceremony, start here: Context: OmO 60K Stars on X 🚀 Install One line. No global install, no…
read the full lazycodex overview →
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Frequently asked questions
Is haystack or lazycodex more popular?
haystack has 26,924 GitHub stars and lazycodex has 3,870. haystack has the larger community by that measure.
Are haystack and lazycodex free?
Both are open source. haystack is licensed under Apache-2.0 and lazycodex under MIT. Neither carries a licence fee.
What is the difference between haystack and lazycodex?
haystack is written in Python and lazycodex 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 lazycodex?
Choose haystack if you want the larger community (26,924 stars) or its Apache-2.0 licence terms. Choose lazycodex if its feature set, stack or MIT licence fits better. Both are self-hostable.