A self-hosted alternative to LangSmith designed for tracing and evaluating LLM pipelines. It provides granular token usage analytics, prompt versioning, and regression testing without exposing sensitive inference data to third-party SaaS providers.
Tech Stack
TypeScriptAI, ML & Data
Why langwatch?
• Detailed token-level cost tracking
• Privacy-first architecture
• Integrated prompt playground
Limitations
• Requires ClickHouse for scale
• Newer ecosystem than LangSmith
• Setup complexity for high volume
3/5/2026
Last Update
273
Forks
325
Issues
Other
License
Financial Leak Detected
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