LlamaIndex vs Haystack: Head-to-Head Comparison

Quick Verdict

LlamaIndex is the better pick for retrieval-augmented generation over your own data. Haystack is the better pick for production search and RAG pipelines.

---

At a Glance

Feature	LlamaIndex	Haystack
Best For	Retrieval-augmented generation over your own data	Production search and RAG pipelines
Pricing	Free and open source	Free and open source
Free to Start	Yes	Yes
License	Open source	Open source
Deployment	Library / framework in your stack	Library / framework in your stack
Link	Visit LlamaIndex	Visit Haystack

---

Detailed Breakdown

LlamaIndex

Data framework for LLM apps and RAG

Pros:

• Strong ingestion and indexing
• Many data connectors
• Agent workflows

Cons:

• Overlaps with LangChain
• Learning curve

---

Haystack

Open-source LLM framework by deepset

Pros:

• Clear pipeline architecture
• Production focus
• Many integrations

Cons:

• Smaller community
• Python only

---

Key Differences

• Positioning: LlamaIndex — data framework for LLM apps and RAG. Haystack — open-source LLM framework by deepset.
• Both share the same licensing model (open source), so the decision comes down to features and workflow fit.
• Pricing: LlamaIndex — free and open source. Haystack — free and open source.
• Signature strength: LlamaIndex — strong ingestion and indexing. Haystack — clear pipeline architecture.

---

Frequently Asked Questions

Is LlamaIndex better than Haystack?

It depends on your requirements. LlamaIndex is a strong fit for retrieval-augmented generation over your own data, while Haystack suits production search and RAG pipelines.

Is LlamaIndex free to use?

Yes, you can start with LlamaIndex for free. Pricing model: Free and open source.

Is Haystack free to use?

Yes, you can start with Haystack for free. Pricing model: Free and open source.

Can I self-host LlamaIndex or Haystack?

LlamaIndex runs inside your own stack: library / framework in your stack. Haystack runs inside your own stack: library / framework in your stack.

What are the main drawbacks of LlamaIndex and Haystack?

LlamaIndex: overlaps with LangChain; learning curve. Haystack: smaller community; Python only.