head to head · open source
haystack vs one
haystack has 26,924 GitHub stars, 3,388 forks, 143 open issues and last shipped yesterday. one has 1,765 stars, 543 forks, 771 open issues and last shipped 2 days ago. haystack leads on adoption by 1,425% (26,924 vs 1,765 stars). haystack is written in Python under Apache-2.0; one is written in JavaScript under Apache-2.0. haystack has attracted 13% as many forks as stars, one 31%. haystack 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
| haystack | one | |
|---|---|---|
| GitHub stars | ★ 27K | ★ 1.8K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | JavaScript |
| Last push | 2026-11-04 | 2026-11-03 |
| Forks | ⑂ 3.4K | ⑂ 543 |
| 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 one if
- You want the one feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches JavaScript
- You evaluated both and one 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 one
Description OpenNebula is an open source cloud management platform for building and operating private clouds, edge infrastructures, distributed cloud deployments, and AI Factories. It provides a unified platform to manage Virtual Machines, Kubernetes Clusters, and GPU accelerated workloads across on premises, edge, and hybrid environments through a simple yet powerful cloud operating model. Key Features Unified Cloud Management – Manage virtualized, containerized, and AI workloads from a single platform. Flexible Access Interfaces – Web UI, CLI, REST API, Terraform provider, and automation tools. Federated…
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Frequently asked questions
Is haystack or one more popular?
haystack has 26,924 GitHub stars and one has 1,765. haystack has the larger community by that measure.
Are haystack and one free?
Both are open source. haystack is licensed under Apache-2.0 and one under Apache-2.0. Neither carries a licence fee.
What is the difference between haystack and one?
haystack is written in Python and one in JavaScript. 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 one?
Choose haystack if you want the larger community (26,924 stars) or its Apache-2.0 licence terms. Choose one if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.