LangWatch
Open-source agent testing and observability built around the Scenario simulation framework, covering text, voice and adversarial tests.
| Category | Evals & Testing |
| Open source | Yes |
| Self-hostable | Yes |
| Pricing model | freemium |
| Pricing notes | OSS self-host; cloud free tier + paid plans |
| Framework integrations | openai-sdk, langchain, dspy, opentelemetry, vercel-ai |
| Funding / ownership | Netherlands-based; seed stage |
Pricing/feature source: https://langwatch.ai/pricing