Code · Vendor site 2026-10-04
LangWatch is a platform for testing, evaluating, and observing LLM agents in production. It covers simulations, evals, tracing, prompt management, AI gateway routing, voice agent testing, and red-teaming with cloud or self-hosted deployment options.
Engineering teams shipping agents who need simulation-based testing, production traces, and eval workflows before and after launch.
Growth is listed at €29 per core seat per month with USD amounts absent; Developer free tier caps events at 50k per month and data access at 14 days.
LangWatch combines simulations, evals, tracing, and gateway controls so teams can harden LLM agents before release and monitor them once live, starting from a free developer tier.
What it can do
Unknown is different from unavailable. Each fact carries its own evidence.
| Capability | Value | Evidence | Checked |
|---|---|---|---|
| Agent testing | Homepage highlights simulation-based agent testing and LLM evaluation before production. | Facts sourced | 2026-10-04 |
| Observability | Product menu lists LLM observability for tracing steps, cost, and latency in production. | Facts sourced | 2026-10-04 |
| Free developer tier | Pricing shows Developer at €0 with 50k monthly events and no credit card required. | Facts sourced | 2026-10-04 |
Understand the total cost
Free
Free
Developer tier is free forever with 50k events per month, 14-day data access, two users, and community support; paid Growth seats are quoted in euros.
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LangWatch is a platform for testing, evaluating, and observing LLM agents in production. It covers simulations, evals, tracing, prompt management, AI gateway routing, voice agent testing, and red-teaming with cloud or self-hosted deployment options.
Developer tier is free forever with 50k events per month, 14-day data access, two users, and community support; paid Growth seats are quoted in euros.. This record lists ongoing free access; check the plan limits before starting.
No paid monthly price is listed; this record treats the product as free to start. See the plan cards for entitlements, billing commitments and seat minimums.
Platform modules include an AI Gateway endpoint and observability APIs for tracing agent runs and costs.. API access and subscription access may have different terms; consult the linked sources.
Growth is listed at €29 per core seat per month with USD amounts absent; Developer free tier caps events at 50k per month and data access at 14 days.
No retained pricing changes yet. A current price alone does not establish a historical trend.
Reviewed vendor source
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