# LangWatch: Free Open Source Alternative to Arize, Braintrust, Galileo

Canonical: https://caniforkit.com/fork/langwatch
Last updated: 2026-11-07

LangWatch (Open Source, Open Source) replaces Arize, Braintrust, Galileo, Humanloop. Tests AI agents through multi-turn simulations, LLM-based scoring, and production tracing so teams can ship reliable agents with confidence.

## Tool Specifications
- **Tool Name**: LangWatch
- **Type**: Open Source Project
- **License**: Open Source
- **Official Website**: https://langwatch.ai/
- **GitHub Repository**: https://github.com/langwatch/langwatch
- **GitHub Stars**: ★ 5k
- **Runs On**: Local
- **Maintenance Status**: nov 2026
- **Platforms**: desktop, cross-platform, one-click install
- **Data Storage**: All application data lives locally on your own machine.
- **Installation**: Clone https://github.com/langwatch/langwatch or deploy with Docker Compose
- **Setup Requirements**: Download the native package or installer for your operating system.
- **The Catch / Limitation**: Community-driven open source project without dedicated enterprise SLAs.

## Paid SaaS Applications Replaced (7)
Replacing these paid tools with LangWatch saves up to $245/mo ($2,940/yr) in software subscriptions:

| Replaced Software | Category | SaaS Price | Comparison Guide |
| --- | --- | --- | --- |
| [Arize](https://caniforkit.com/arize) | [analytics](https://caniforkit.com/category/analytics) | $35/mo | [Compare Arize vs LangWatch](https://caniforkit.com/vs/arize-vs-langwatch) |
| [Braintrust](https://caniforkit.com/braintrust) | [analytics](https://caniforkit.com/category/analytics) | $35/mo | [Compare Braintrust vs LangWatch](https://caniforkit.com/vs/braintrust-vs-langwatch) |
| [Galileo](https://caniforkit.com/galileo) | [analytics](https://caniforkit.com/category/analytics) | $35/mo | [Compare Galileo vs LangWatch](https://caniforkit.com/vs/galileo-vs-langwatch) |
| [Humanloop](https://caniforkit.com/humanloop) | [analytics](https://caniforkit.com/category/analytics) | $35/mo | [Compare Humanloop vs LangWatch](https://caniforkit.com/vs/humanloop-vs-langwatch) |
| [LangSmith](https://caniforkit.com/langsmith) | [analytics](https://caniforkit.com/category/analytics) | $35/mo | [Compare LangSmith vs LangWatch](https://caniforkit.com/vs/langsmith-vs-langwatch) |
| [Maxim](https://caniforkit.com/maxim) | [analytics](https://caniforkit.com/category/analytics) | $35/mo | [Compare Maxim vs LangWatch](https://caniforkit.com/vs/maxim-vs-langwatch) |
| [Weights and Biases](https://caniforkit.com/weights-and-biases) | [analytics](https://caniforkit.com/category/analytics) | $35/mo | [Compare Weights and Biases vs LangWatch](https://caniforkit.com/vs/weights-and-biases-vs-langwatch) |

## Frequently Asked Questions

### Is LangWatch free and open source?
LangWatch is an open source tool licensed under Open Source that runs on local. Tests AI agents through multi-turn simulations, LLM-based scoring, and production tracing so teams can ship reliable agents with confidence.

### What is the trade-off or limitation of using LangWatch?
Community-driven open source project without dedicated enterprise SLAs.

## Related

- [Self-Hosted Open Source Directory](https://caniforkit.com/self-hosted)
- [All Paid SaaS Alternatives Index](https://caniforkit.com/alternatives)
- [Software Categories Directory](https://caniforkit.com/categories)
- [Homepage](https://caniforkit.com)