# Instructor vs PydanticAI — Fit & Features

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

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

## Compare fit, features, and limitations

### Instructor
Extract validated structured data from language model responses.
Best fit: Developers composing agents, structured model outputs, and tool workflows.
- Structured outputs
- Schema validation
- Provider integrations
Before you choose: Check licensing, provider compatibility, maintenance, and tool permissions. Test failure recovery before enabling agent actions.
Pricing: https://python.useinstructor.com
- [Read Instructor profile](https://trutool.co/tools/instructor): Read Instructor 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