📖 The AI Tool Bible

Haystack vs Weaviate

A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.

 
Haystack
RAG
Weaviate
RAG
TaglineOpen-source Python framework from deepset for building production RAG pipelines and LLM agents.Open-source vector DB with hybrid search and modules.
CategoryRAGRAG
PricingFreemium· Open-source free; deepset Enterprise Support and AI Platform via salesFreemium· Free open-source; cloud from $25/mo
ModelMulti-modelHosted vector DB (not an LLM)
Editorial score—8.4 / 10
Use cases
ragagentssemantic-searchconversational-aitool-use
self-hosted RAGhybrid search
Pros
  • Genuinely open source (Apache-2.0) with an active community
  • Composable pipeline graph is serializable and easy to inspect
  • Wide integration matrix across LLM providers and vector stores
  • Production-oriented: K8s friendly, cloud-agnostic, debuggable
  • Hybrid search built in
  • Self-host or cloud
  • Module ecosystem
  • GraphQL + REST APIs
Cons
  • More boilerplate than higher-level agent frameworks
  • Enterprise platform pricing is opaque
  • Python-only; no first-class JS/TS SDK
  • More ops than Pinecone if self-hosted
  • Smaller community
Websitehaystack.deepset.aiweaviate.io
Pick Haystack if
  • ✅ Genuinely open source (Apache-2.0) with an active community
  • ✅ Composable pipeline graph is serializable and easy to inspect
  • ✅ Wide integration matrix across LLM providers and vector stores
  • ✅ Production-oriented: K8s friendly, cloud-agnostic, debuggable
Pick Weaviate if
  • ✅ Hybrid search built in
  • ✅ Self-host or cloud
  • ✅ Module ecosystem
  • ✅ GraphQL + REST APIs
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