# eliza vs pydantic-ai
_Agent Frameworks · independent comparison_

> eliza and pydantic-ai are both open-source agent frameworks you can self-host for free. eliza is written primarily in TypeScript; pydantic-ai in Python. Neither is universally better — pick by fit.

## Side by side

**eliza**
- Open source · Framework · 19k★ · TypeScript · MIT · active 2 days ago
- Best for: A local-first agent OS running on desktop, mobile, or as a system assistant.
- [listing](https://agentsearchengine.app/agents/eliza) · [official](https://elizaos.ai/)

**pydantic-ai**
- Open source · Framework · 19k★ · Python · MIT · active 2 days ago
- Best for: Python teams that want type-safe agent development with the Pydantic philosophy.
- Avoid if: You are not working in Python.
- [listing](https://agentsearchengine.app/agents/pydantic-ai) · [official](https://pydantic.dev/pydantic-ai)

## Key differences

- eliza is written primarily in TypeScript; pydantic-ai in Python.

## Which to choose

**Choose eliza if:** A local-first agent OS running on desktop, mobile, or as a system assistant.

**Choose pydantic-ai if:** Python teams that want type-safe agent development with the Pydantic philosophy.

## FAQ

**What's the main difference between eliza and pydantic-ai?**
eliza is written primarily in TypeScript; pydantic-ai in Python.

**Is eliza or pydantic-ai better?**
Neither is universally better. eliza is the stronger fit for A local-first agent OS running on desktop, mobile, or as a system assistant; pydantic-ai for Python teams that want type-safe agent development with the Pydantic philosophy. Use the side-by-side specs to decide by your own constraints.

**Is eliza or pydantic-ai free?**
eliza is free to run and self-host; pydantic-ai is free to run and self-host. Both are free to self-host — you only pay for the infrastructure and any model or API usage.

**Which is more popular, eliza or pydantic-ai?**
By GitHub stars — a proxy for open-source adoption — pydantic-ai is ahead (19k vs 19k). Stars measure attention, not necessarily the better fit for you.

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Source: [Agent Search Engine](https://agentsearchengine.app) — https://agentsearchengine.app/compare/eliza-vs-pydantic-ai