LangWatch
LangWatch provides AI observability and evaluation tools for testing, monitoring, and improving LLM applications and AI agents, with prompt evaluation, metrics, and production monitoring.
LangWatch is an open-core LLMOps platform designed to test, evaluate, observe, and monitor LLM applications and AI agents. It helps engineering and product teams identify quality, performance, safety, and cost issues across development and production.
The platform combines LLM observability, agent simulations, evaluations, guardrails, prompt management, AI gateway controls, and governance features. It supports multi-turn AI applications and can integrate with existing monitoring workflows through OpenTelemetry.
How LangWatch Works
- Instrument Applications: Connect LLM applications using OpenTelemetry or supported integrations such as LangGraph and OpenAI agents.
- Ingest Data: Send application traces directly to LangWatch or route AI requests through the optional AI Gateway.
- Evaluate & Test: Run evaluations, guardrails, and simulated scenarios using automated and LLM-based judges.
- Monitor Performance: Track traces, latency, token usage, costs, and application behavior through the dashboard.
- Govern AI Usage: Review audit trails, user activity, budgets, and anomalies across AI applications.
How We Rated LangWatch
We considered LangWatch's LLM observability, AI agent testing, evaluations, simulations, guardrails, prompt management, AI gateway, governance features, deployment options, integrations, and pricing.
Pros
- Native OpenTelemetry support
- Strong multi-turn AI agent testing
- Cloud and self-hosted deployment options
- Combines observability, testing, gateway, and governance tools
Cons
- LLM-based evaluations cannot guarantee absolute correctness or safety
- Advanced enterprise capabilities require paid plans or custom setups
LangWatch is best suited for:
- AI and LLM engineering teams
- Developers building AI agents and voice bots
- QA and MLOps teams
- Enterprises with AI governance requirements
- Teams managing multiple AI applications and API providers
You should choose LangWatch if you want to:
- Test AI agents before production
- Evaluate LLM responses and application quality
- Monitor multi-step LLM and agent interactions
- Run simulated user scenarios and red-team tests
- Track latency, token usage, and AI costs
- Manage prompts and run prompt experiments
- Add guardrails and governance to AI applications
LangWatch's Key Features
LLM Observability
AI Agent Testing & Simulations
AI Gateway
AI Governance
Prompt Management
Evaluations & Guardrails
Pricing
Free
Free
Growth
$34 /mo
Disclaimer: for the latest and most accurate pricing, please visit the official LangWatch website.
Frequently Asked Questions
0.0
Based on user reviews
Reviews are moderated before they appear here. Share your experience with LangWatch to help others decide.
Write a review
Rhea Kapoor
Excellent tool! Saved me hours of work. Highly recommended.
Alternatives to LangWatch
Other tools worth comparing before you commit.
Freemium
Deepchecks
Deepchecks provides tools for testing, evaluating, monitoring, and debugging LLM applications and AI agents with automated scoring, observability, production monitoring, and evaluation metrics.
Free
Inspect AI
Inspect AI provides an open-source framework for evaluating LLMs and AI agents with benchmarks, datasets, solvers, scorers, tools, and flexible evaluation workflows.
Freemium
Evidently AI
Evidently AI provides tools for evaluating, testing, and monitoring AI and machine learning systems, with metrics, data drift detection, dashboards, reports, and LLM evaluation.
Featured AI Tools
Explore more hand-picked AI tools from our directory.
Fliki
FreemiumFliki is an AI-powered text-to-video and voice generation platform that helps users create professional videos with realistic AI voices, stock media, and multilingual support.
Claude
FreemiumClaude is an AI assistant that helps users write, code, analyze documents, conduct research, and solve complex tasks efficiently.
ChatGPT
FreemiumChatGPT provides an AI-powered assistant from OpenAI that helps users write content, answer questions, generate code, create images, and analyze files. It supports everyday tasks, learning, research, and business workflows through natural, conversational AI.
Notion AI
FreemiumNotion AI helps teams write, search, summarize, automate tasks, and manage workspace data with AI agents, meeting notes, database tools, and connected apps. See features, pros, cons, and more.
You.com
FreemiumYou.com review covering its features, pricing, pros, cons, and alternatives. Learn how its AI search provides direct answers, source citations, research tools, writing, coding, and more.
Monica AI
FreemiumMonica AI review covering its features, pricing, pros, cons, and alternatives. Learn how it combines multiple AI models for writing, research, summaries, translation, coding, and more.