LangWatch
LangWatch ingests agent dialogues and scenarios, simulates user interactions, runs judge‑based evaluations, and records observability data for cloud, hybrid, or self‑hosted agents using an open Scenario SDK so teams can validate agent behavior, regression‑test changes, and track governance metrics across environments.
Developer: free forever with limits; Growth: €29 per core-seat / month plus event charges; Enterprise: custom, negotiated.Is LangWatch right for you?
Good for
- Engineering teams building conversational or voice agents who need simulation‑based testing, observability, and governance across cloud, hybrid, or self‑hosted deployments.
- Supports cloud, hybrid, or self-hosted deployments so you can keep data on your infrastructure.
- Provides end-to-end agent testing: simulation, judge-based evaluation, and CI/local execution to integrate tests into development workflows.
Keep in mind
- Developer plan data is retained only for a short window (14-day access) which may hamper longer-term debugging or analytics.
- Production costs scale with events; after included events you pay per 100k events which can increase operating expense for high-volume agents.
- If you expect a free production tier without event‑based usage charges, confirm Growth versus Enterprise billing because production usage is metered and Growth includes per‑event charges beyond allowances.
Pricing and plan limits
The linked official pages list a permanent Developer free tier and a Growth price with clear per-seat and usage rates; Enterprise pricing is custom and requires sales contact.
More about capabilities and limits
Documented strengths
Supports cloud, hybrid, or self-hosted deployments so you can keep data on your infrastructure.
Provides end-to-end agent testing: simulation, judge-based evaluation, and CI/local execution to integrate tests into development workflows.
Limitations to consider
Developer plan data is retained only for a short window (14-day access) which may hamper longer-term debugging or analytics.
Production costs scale with events; after included events you pay per 100k events which can increase operating expense for high-volume agents.
Choosing a plan
Run the Developer tier with representative scenarios to measure event consumption, retention windows, and simulation fidelity, then estimate monthly events and verify Enterprise billing/retention options if you exceed Growth limits.
Based on the linked product documentation.
Available on
Web, Api.
Official sources
Alternatives to LangWatch
Choose around the work you need to do.
Traceloop
Use Traceloop to instrument and monitor agents and models in production, capturing prompts, responses, latency, and running built-in and custom evaluations with cloud and on-prem deployment options.
AgentOps
Choose AgentOps when you need developer-focused recording, inspection, and replay of agent runs to investigate failures, tool calls, and model spending during agent development and operations.
Braintrust
Consider Braintrust if you want full production tracing plus automated scoring, dashboards, and a built-in loop for iterating on prompts and evaluations of deployed agents.