Platform for tracing, testing and evaluating LLM agents and AI applications in development and production.
LangWatch is an agent observability and evaluation platform for AI platform teams. It traces every LLM call and agent step, monitors cost and latency, and supports online and offline evaluations using LLM as a judge, custom code or workflows. Teams can run simulated user scenarios in text and voice, red-team agents for safety gaps, manage prompts as code, and route model calls through an AI gateway with budgets. It works with OpenTelemetry and common agent frameworks, and also tracks coding agents such as Claude Code and Codex. It is sold with a free sign-up, paid plans and a self-host option.
Free
€29/mo per core-seat
Customcontact sales
Prices in EUR, as shown by langwatch.ai. Source: pricing page. Last checked October 30, 2026.
Copy the prompt below and paste it into the agent you already use. It has the plans and prices from this page and asks you the right questions first.
I want to decide whether LangWatch (langwatch.ai) is the right tool and which plan to pick. Below is what the StableMRR pricing directory read from LangWatch's own pricing page (last checked 2026-10-30). It can be out of date, so treat it as a starting point. Category: Developer tools / Monitoring and observability What it does: Platform for tracing, testing and evaluating LLM agents and AI applications in development and production. Plans: - Developer: Free. Limits: events 50k events / month, data access 14-day data access, users 2 users, scenarios 3 scenarios, simulations 3 simulations, custom evals 3 custom evals. Includes: Agent simulations, Offline experiments via SDK, Traces and graphs, Prompt version control, Playground - Growth: €29/mo per core-seat. Limits: events included 200k events included, then €5 / 100k, retention 30-day retention included, lite-users Unlimited lite-users. Includes: Unlimited simulations, evals, prompts, Online evaluations and monitors, Private Slack / Teams support, Prompt experiments and A/B testing, Guardrails code integration - Enterprise: Contact sales. Limits: data retention Custom data retention. Includes: Hybrid, self-hosted or on-prem, Custom SSO / RBAC, Audit logs and SLAs, ISO 27001 reports, Custom Terms, DPA Alternatives in the directory: AgentGov, ActivityProof, Adadot, Adversemonitor Pricing page: https://langwatch.ai/pricing Directory listing: https://stablemrr.com/p/langwatch-ai First ask me three short questions about my team size, budget and what I need it for. Then recommend one plan, tell me what could make it a bad fit, and compare it with the alternatives. Finish with what I should check on the vendor's site before I pay.
No price changes recorded since we started tracking on October 30, 2026.
| Product | Category | Free plan | Paid from | Plans | Checked |
|---|---|---|---|---|---|
| AgentGovMonitors, traces and governs AI agents with cost analytics, incident tracking and EU AI Act compliance tools. | Monitoring and observability | Yes | $29/mo | 4 | Oct 29, 2026 |
| ActivityProofCreates a live shipping-status badge for product sites, driven by GitHub commit activity. | Monitoring and observability | No | - | 2 | Oct 29, 2026 |
| AdadotDeveloper analytics platform that benchmarks engineering metrics and collaboration data to help teams understand productivity and wellbeing. | Monitoring and observability | Yes | $10/mo | 4 | Oct 29, 2026 |
| AdversemonitorMonitors company names and domains for dark web and ransomware mentions and shows the matching source records. | Monitoring and observability | No | - | 3 | Oct 29, 2026 |
| Agent PetsChrome extension that turns coding agent sessions into pets and lets users approve prompts and reply from any tab. | Monitoring and observability | No | - | 1 | Oct 29, 2026 |
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How this page was made. Plans and prices are read automatically from langwatch.ai's public pricing page, checked against the page text, and re-checked about every week. Method. Something wrong? Tell us.
