# BAML vs Haystack — Fit & Features

Canonical: https://trutool.co/compare/baml-vs-haystack
Author: Snehil (https://trutool.co/authors/snehil)

Compare BAML and Haystack by use case, features, limitations, and evaluation questions.

## Compare fit, features, and limitations

### BAML
Define typed LLM functions and test prompts with a dedicated language.
Best fit: Developers composing agents, structured model outputs, and tool workflows.
- Typed LLM functions
- Prompt testing
- Code generation
Before you choose: Check licensing, provider compatibility, maintenance, and tool permissions. Test failure recovery before enabling agent actions.
Pricing: https://docs.boundaryml.com/home
- [Read BAML profile](https://trutool.co/tools/baml): Read BAML profile

### Haystack
Framework for retrieval-augmented generation and AI agent pipelines.
Best fit: Developers building and evaluating custom agents.
- Framework for retrieval-augmented generation and AI agent pipelines
Before you choose: Check licensing, maintenance status, supported providers, and hosting or inference costs.
Pricing: https://haystack.deepset.ai/
- [Read Haystack profile](https://trutool.co/tools/haystack): Read Haystack profile