LangWatch
LLMOps platform combining tracing, evaluations, agent simulations, and prompt management.
About
Agent simulation testing is the headline capability LangWatch has built out: scripted scenarios with simulated users, tools, and state run against a real agent stack, turning end-to-end behavior into something CI can gate on. Around it sit the standard LLMOps pillars done thoroughly: OpenTelemetry-native tracing that stays framework and provider agnostic, offline and online evaluations, dataset curation from production traces, prompt versioning with GitHub integration, and an AI gateway offering an OpenAI and Anthropic compatible proxy with virtual keys, hierarchical budgets, inline guardrails, and automatic provider fallback. SDKs cover Python, TypeScript, and Go, with integrations for LangChain, LangGraph, Vercel AI, CrewAI, Mastra, and Google ADK. The core platform is Apache-2.0 with commercial enterprise modules confined to an ee directory, and deployment spans Docker Compose, Helm charts, and on-prem variants for AWS, Google Cloud, and Azure alongside the hosted cloud at langwatch.ai. At about 3,400 GitHub stars, it is documented at docs.langwatch.ai.
Should you use LangWatch?
Pick it when
Pick LangWatch when you need to gate CI on end-to-end agent behavior using simulated users and tools, and also want tracing, evals, prompt versioning, and a budget-enforcing gateway in one self-hostable platform.
Look elsewhere when
Skip it if you only need tracing or only need evals; the broad platform is more to deploy and learn than Langfuse or DeepEval. Enterprise modules sit under a commercial license in the ee directory.
Alternatives to LangWatch
- Langfuse
Simpler to adopt for tracing, prompts, and evals under an MIT license; no built-in agent simulation scenarios or AI gateway.
- Promptfoo
Lightweight CLI for prompt evals and red-teaming in CI with no server to run; tests prompts and models, not simulated agent sessions.
- Portkey AI Gateway
Dedicated MIT gateway with 1,600+ models, fallbacks, caching, and 50+ guardrails if routing is the need; no evals or agent simulations.
- LangSmith
Managed commercial alternative with online evaluators and annotation queues; nothing to host, but closed source.
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Details
- Category
- AI Observability & Evaluation
- Price
- Freemium
- Platform
- Hybrid
- Difficulty
- Intermediate (3/5)
- License
- Apache-2.0
- Added
- Jul 29, 2026