kitio.aiAdded Oct 29, 2026
LangWatch
FreemiumTracing, evals and testing for LLM agents in production
What is LangWatch?
LangWatch is an observability and evaluation platform for teams that ship AI agents. It traces every agent step, runs evals and simulated user scenarios, manages prompts and routes calls through a gateway with budgets per person, team and customer.
Beyond tracing cost and latency, the platform can run realistic user scenarios against an agent, red-team it with simulated attacks, and test voice agents before they talk to customers. A feature called Langy reads traces, writes tests and opens a pull request, and Instant Evals searches production history on demand.
Prompts are versioned and deployed as code with GitHub sync. You can use LangWatch Cloud or a self-managed install, and the site also offers tracking for Claude Code usage across a company.
Features
- LLM tracing
- Agent simulations
- Evals
- AI gateway
- Prompt management
- Red-teaming
Tags
Releases
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Organization
LangWatch
Listed by kitio.ai · unverified owner
Pricing
- Pricing model
- Freemium
- Paid options from
- Not listed
LangWatch plans
Developer
Free
- 50k events per month
- 14-day data access
- 2 users
- Community support
Growth
€29/core seat/mo
- Per core seat
- 200k events included
- Unlimited simulations, evals and prompts
- Private Slack or Teams support
Enterprise
Custom
- Volume event pricing
- SSO and RBAC
- Forward deployed engineer
Prices in USD, checked Oct 29, 2026. Plans change often, so confirm on the LangWatch site.Official pricing
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Pros and cons
Pros
- Free plan with no card
- Self-hosting available
- Simulations, evals and tracing in one tool
Cons
- Prices are shown in euros
- Free plan keeps data for 14 days
- Events are billed beyond the allowance
Prompts & results
No prompts yet. Add your own prompt and output to help others use this tool.
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Reviews
Q&A
What is LangWatch?
LangWatch is an observability and evaluation platform for teams that ship AI agents. It traces every agent step, runs evals and simulated user scenarios, manages prompts and routes calls through a gateway with budgets per person, team and customer.
Can I self-host LangWatch?
Yes. The pricing page offers LangWatch Cloud or a self-managed option.
How is the Growth plan billed?
It costs €29 per core seat per month with 200k events included, then €5 per 100k events.
How much does LangWatch cost?
LangWatch is freemium.
Is there a free version of LangWatch?
Yes. LangWatch has a free plan, and paid plans add more usage and features.
What are the main features of LangWatch?
LLM tracing, Agent simulations, Evals, AI gateway, Prompt management, Red-teaming.
Who makes LangWatch?
LangWatch is made by LangWatch.
What are the best alternatives to LangWatch?
Popular alternatives include LangSmith, Portkey, AgentOps.