LangWatch
Open-core platform for agent observability and evals: tracing, agent simulation tests, evaluations, prompt management, an AI gateway and coding-agent usage tracking.
Tags
Description
Areas: LLM Ops (observability, agent testing via simulations, evaluations, prompt management), Coding Agents (sessions and cost per pull request for Claude Code, Codex, Copilot, opencode), AI Gateway (OpenAI/Anthropic-compatible endpoint, virtual keys, budgets, routing) and AI Governance. Integrates with LangChain, LangGraph, Vercel AI SDK, Mastra, CrewAI, Google ADK, DSPy and OpenTelemetry, and has an MCP server. Core is Apache-2.0; modules under enterprise/ need a commercial license in production; SDKs are MIT. Cloud plans: Developer free (50k events/month), Growth €29 per core-seat/month, Enterprise; self-host with npx @langwatch/server or docker compose.
Agent access
Related
- Langfuse: Open-source agent evals and observability platform: trace, evaluate and improve LLM applications and agents.
- LangSmith: LangChain's agent and LLM observability and evaluation platform: tracing, monitoring, cost and latency tracking.
- Arize Phoenix: Open-source AI observability and evaluation platform from Arize.
- Helicone: Open-source AI gateway and LLM observability platform for routing, monitoring, evaluating and experimenting.
Sources
- https://github.com/langwatch/langwatch
- https://langwatch.ai/pricing
- https://langwatch.ai/docs/self-hosting/licensing
- https://langwatch.ai/docs/llms.txt
Machine-readable
- JSON
- Markdown
- Source file on GitHub (edit via pull request)