Machine Learning · head to head
Haystack vs Zilliz
Haystack
Machine Learning
Open-source AI orchestration framework for LLM applications
- From
- Free
- Rated
- -
Zilliz
Databases
Managed vector database and vector lakebase for AI applications
- From
- Free
- Rated
- -
The short version
- Each has a real cost: Haystack requires Python programming knowledge for advanced customization; Zilliz pricing structure not publicly disclosed, requires sales contact
- They diverge on capability: Haystack covers Modular pipeline composition, Zilliz covers Vector indexing.
- Prices and features above were last checked on 29 August 2026.
Where they differ
Only the attributes on which Haystack and Zilliz actually diverge.
Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Haystack
- Modular pipeline composition
- Multi-provider LLM support
- Retrieval-augmented generation
- Agent framework
- Memory management
- Observability and debugging
- Kubernetes-ready deployment
Only in Zilliz
- Vector indexing
- Distributed architecture
- SQL interface
- Tensor support
- Real-time search
- Cloud-native
- Open-source compatible
What people use each for
The jobs each tool is most often brought in to do.
Haystack
- Building production LLM applications with full controlnot Zilliz
- Creating retrieval-augmented generation systemsnot Zilliz
- Developing autonomous AI agentsnot Zilliz
- Multi-provider LLM orchestrationnot Zilliz
- Enterprise AI infrastructurenot Zilliz
Zilliz
- Build retrieval-augmented generation (RAG) systemsnot Haystack
- Implement semantic search over documentsnot Haystack
- Create multimodal search with text and imagesnot Haystack
- Power recommendation engines with vector similaritynot Haystack
- Enable similarity search on user embeddingsnot Haystack
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Haystack
- Requires Python programming knowledge for advanced customization
- Steeper learning curve compared to no-code platforms
- Community support only on free tier may limit enterprise adoption
- Ongoing maintenance dependency for open-source framework
Zilliz
- Pricing structure not publicly disclosed, requires sales contact
- Operational complexity for self-hosted Milvus deployments
- Learning curve for those unfamiliar with vector databases
- Limited built-in analytics compared to some alternatives
Pricing, plan by plan
Haystack
Free- Open SourceFree
- Full framework access
- Community Discord support
- GitHub community contributions
- Enterprise Support$undefined/custom
- Private secure engineering support
- Best practices templates and deployment guides
- Flexible services and integrations
Zilliz
FreeNo published plan breakdown. See the Zilliz review.
Which should you pick?
Choose Haystack if
- You need modular pipeline composition.
- You want to start without paying.
- You work on Python, Cloud-agnostic.
- You also want multi-provider llm support.
Choose Zilliz if
- You need vector indexing.
- You want to start without paying.
- You work on Cloud, Self-hosted.
- You also want distributed architecture.
Questions people ask
- Is Haystack or Zilliz better?
- Neither clearly leads. Haystack starts at Free and Zilliz at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Haystack or Zilliz?
- Haystack starts at Free and Zilliz at Free.
- Does Haystack or Zilliz run on more platforms?
- Haystack runs on Python, Cloud-agnostic. Zilliz runs on Cloud, Self-hosted.
- Can I use Haystack for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Haystack best used for?
- Haystack is most often used for building production llm applications with full control, creating retrieval-augmented generation systems, developing autonomous ai agents, multi-provider llm orchestration. Of those, building production llm applications with full control and creating retrieval-augmented generation systems are not what Zilliz is typically brought in for.
- What can Haystack do that Zilliz cannot?
- Haystack covers Modular pipeline composition, Multi-provider LLM support, Retrieval-augmented generation, Agent framework. Zilliz covers Vector indexing, Distributed architecture, SQL interface, Tensor support.
Answered from the vendors’ own pages
Haystack: Is Haystack completely free to use?
Yes, the open-source Haystack framework is completely free. deepset offers optional paid enterprise support packages for organizations needing secure engineering support and deployment guidance.
SourceZilliz: What is the difference between Milvus and Zilliz Cloud?
Milvus is the open-source vector database that you can self-host. Zilliz Cloud is the fully managed service built on Milvus that removes operational overhead and handles scaling automatically.
SourceHaystack: What LLM providers does Haystack support?
Haystack supports multiple LLM providers including OpenAI, Anthropic, Mistral, Cohere, and others, allowing teams to avoid vendor lock-in and switch providers as needed.
SourceZilliz: How many vectors can Zilliz handle?
Milvus and Zilliz Cloud can store and search billions of vectors through their distributed architecture that separates storage and compute layers.
SourceHaystack: Can I deploy Haystack in production environments?
Yes, Haystack is designed for production use with Kubernetes-ready pipelines, built-in reliability features, and observability tools for enterprise-scale deployments.
SourceZilliz: Is Milvus open-source?
Yes, Milvus is open-source under the Apache License 2.0 and is part of the LF AI & Data Foundation.
SourceZilliz: What pricing does Zilliz Cloud offer?
Zilliz Cloud pricing is not publicly listed and requires contacting their team to discuss your specific scale and use case requirements.
SourceRelated pages
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- Zilliz vs Typesense
- Zilliz vs Materialize
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- Zilliz vs Apache Solr
- Zilliz vs Readyset
- Zilliz vs SurrealDB
- Zilliz vs StarRocks
- Zilliz vs Teradata
- Zilliz vs TIBCO Enterprise Message Service
- Zilliz vs Timeplus
- Zilliz vs turbopuffer