# LangWatch — card for AI agents

LLM observability, evaluation and agent-simulation platform, open source and also hosted.

Maker: LangWatch · category: LLM observability and evals

## Price (official page)
- Free tier: Developer plan: 50k events/month, 14-day data access, 2 users, no credit card
- Usage price: Growth: EUR 29 per core-seat/month incl. 200k events, then EUR 5 per 100k events (prices shown in EUR only)
- Pricing page: https://langwatch.ai/pricing (checked 2026-10-09)
- Note: Pricing page lists EUR only, so numeric USD fields are null. Developer free forever; Growth EUR 29/core-seat/month with 30-day retention (extra retention EUR 3/GB); Enterprise custom. Self-hosting with docker compose is supported; repo is Apache-2.0. Unit is 'events' (every LLM call, tool call, retrieval or eval step).

## Connect
- Official MCP server: @langwatch/mcp-server
- npm: `npm install langwatch`
- PyPI: `pip install langwatch`
- Repository: https://github.com/langwatch/langwatch

## Other APIs in this category
- LangSmith: https://agentgid.com/apis/langsmith/agent.md
- Pydantic Logfire: https://agentgid.com/apis/logfire/agent.md
- Laminar: https://agentgid.com/apis/laminar/agent.md
- W&B Weave: https://agentgid.com/apis/wandb-weave/agent.md
- Ragas: https://agentgid.com/apis/ragas/agent.md

## Links
- AgentGid page: https://agentgid.com/apis/langwatch/

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AgentGid's catalog is curated: every entry was checked against the maker's official pages (registry, repository, license and pricing pages) on the date shown; a license value shows the quote it stands on wherever AgentGid has one. Usage numbers come from AgentGid's own scan of public repositories set up for AI coding agents. Claims by makers are reported, not tested by AgentGid.