# Haystack vs PydanticAI — Fit & Features

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

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

## Compare fit, features, and limitations

### 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

### PydanticAI
Python agent framework with typed outputs and dependency injection.
Best fit: Developers building and evaluating custom agents.
- Python agent framework with typed outputs and dependency injection
Before you choose: Check licensing, maintenance status, supported providers, and hosting or inference costs.
Pricing: https://ai.pydantic.dev/
- [Read PydanticAI profile](https://trutool.co/tools/pydantic-ai): Read PydanticAI profile