# Retell AI vs xiaozhi-esp32-server
_Voice Agents · independent comparison_

> Retell AI and xiaozhi-esp32-server take different routes to the same job: one is a commercial product, the other open-source and self-hostable. Choose based on whether you want a managed experience or full control.

## Side by side

**Retell AI**
- Paid product · Platform
- Best for: Production AI phone agents with low latency and strong call-handling primitives.
- Avoid if: You need on-premise deployment of voice infrastructure.
- [listing](https://agentsearchengine.app/agents/retell-ai) · [official](https://retellai.com)

**xiaozhi-esp32-server**
- Open source · Infrastructure · 10k★ · JavaScript · MIT · active 5 days ago
- [listing](https://agentsearchengine.app/agents/xiaozhi-esp32-server) · [official](http://xiaozhi.biz)

## Key differences

- Retell AI is a commercial product; xiaozhi-esp32-server is open-source and self-hostable.
- Pricing model differs — Retell AI is paid product, xiaozhi-esp32-server is open source.

## Which to choose

**Choose Retell AI if:** Production AI phone agents with low latency and strong call-handling primitives.

**Choose xiaozhi-esp32-server if:** you want an open-source, self-hostable option you control.

## FAQ

**What's the main difference between Retell AI and xiaozhi-esp32-server?**
Retell AI is a commercial product; xiaozhi-esp32-server is open-source and self-hostable.

**Is Retell AI or xiaozhi-esp32-server better?**
Neither is universally better. Retell AI is the stronger fit for Production AI phone agents with low latency and strong call-handling primitives; xiaozhi-esp32-server for an open-source, self-hostable option you control. Use the side-by-side specs to decide by your own constraints.

**Is Retell AI or xiaozhi-esp32-server free?**
Retell AI is a paid product; xiaozhi-esp32-server is free to run and self-host.

**Which is more popular, Retell AI or xiaozhi-esp32-server?**
We rank open-source projects by GitHub adoption, but at least one of these is a commercial product and stars don't measure commercial adoption — so compare them on capabilities and pricing instead.

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Source: [Agent Search Engine](https://agentsearchengine.app) — https://agentsearchengine.app/compare/retell-ai-vs-xiaozhi-esp32-server