#88th of 13 in Observability
LangWatch
Agent observability, simulation testing, AI gateway and governance in one
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- Stars
- 4.9k
- License
- Apache-2.0
- Last commit
- Oct 2026
- Last release
- Oct 2026
Overview
Traces LLM and agent calls through OpenTelemetry and SDK integrations, runs simulation-based agent tests and evaluations, manages prompts, and adds an OpenAI- and Anthropic-compatible gateway with virtual keys and budgets. Also tracks coding-agent sessions (Claude Code, Codex, Copilot) with cost per pull request, and starts locally with npx @langwatch/server. For platform teams governing AI use across a company.
Who it is for: Platform teams governing AI usage across a company
Strengths
- npx @langwatch/server starts a local instance with only Node.js installed
- Coding-agent tracking: sessions and cost per PR for Claude Code, Codex, Copilot
- Gateway virtual keys with budgets for customers or employees
- Governance ingests Copilot Studio, Claude and OpenAI compliance APIs, Workato, S3 audit feeds
Weaknesses
- Open-core: modules under platform/app/ee need a commercial license in production
- No Dockerfile or compose file at the repo root; production setup is in external docs
- README is a feature index; architecture and storage needs are not described
- Cloud signup is the first call to action; self-host gets one line
What it needs
- no GPU
- Needs Node.js
- Models: OpenAI, Anthropic, Azure OpenAI, Vertex AI, Bedrock
Also in Observability
See all 13| Rank | Project | Score |
|---|---|---|
| 1 | LangfuseTracing, prompt management and evals for LLM apps on ClickHouse | 74 out of 100 |
| 2 | PhoenixLLM tracing, evals, datasets and prompt playground built on OpenTelemetry | 74 out of 100 |
| 3 | promptfooCLI for evaluating and red-teaming prompts, agents and RAG | 71 out of 100 |
| #4 | MLflowTracing, evals, prompt registry and AI gateway plus classic ML tracking | 70 out of 100 |
| #5 | OpikTrace, evaluate and monitor LLM apps and agents, Apache-2.0 end to end | 64 out of 100 |