Haystack
Explicit, testable RAG pipelines from deepset. The production-minded one.
92
sovereigntyHaystack models a RAG system as an explicit pipeline graph of components, which sounds like bureaucracy until the day retrieval quality drops and you need to know which stage caused it. That explicitness makes pipelines serialisable, testable and reviewable, and it is why Haystack tends to be the choice in teams who treat retrieval as production software rather than as glue. Apache-2.0, maintained by deepset, with strong evaluation tooling built in.
OPEN SOURCEApache-2.0SELF-HOSTLOCAL-FIRST
LicenseApache-2.0
PricingFree and Apache-2.0; deepset sells a managed enterprise platform on top.
Open sourceYes
Self-hostableYes
Local-first dataYes
What it does well
- +Explicit pipeline graph — debuggable and testable by design
- +Pipelines serialise to YAML, so they can be code-reviewed
- +Built-in evaluation for retrieval and answer quality
- +Apache-2.0 with a commercial support path if wanted
Where it falls short
- −More ceremony than LlamaIndex for a quick prototype
- −Smaller connector library than LlamaIndex's
- −Pipeline abstraction takes a while to think in
Haystack as an alternative to
Where Haystack shows up in our comparisons, and how it ranked.
Haystack head-to-head
Straight comparisons against the tools people weigh it against.