Start for free — no credit card required
The free plan gives you immediate access to all core features, including evaluations, monitoring, and agent simulations.
Events
LangWatch Cloud pricing is based on the number of ingested events per billing period. An event is a standard telemetry point — the building block of everything you observe in LangWatch. The most common event is a span: a single step in your system, such as an LLM call, a tool execution, a retrieval step, a span timer firing, or the point at which an error occurred. A billable event is either:- A span within a trace — the individual steps that make up a request to your agent or LLM application, or
- A scenario or evaluation run — a single execution used to test your AI agents in simulation.
What’s included
Each plan includes a base volume of events stored for a default window. For example, the Growth plan includes 200,000 events stored for 30 days. If you need more — a longer retention window or higher volume — you can extend retention with an Enterprise plan or a self-hosted license.Custom data retention
Retention controls how long your events are kept before they’re automatically removed. Default retention depends on your plan:| Plan | Default retention |
|---|---|
| Free | 14 days |
| Accelerate (legacy) | 30 days |
| Growth | 30 days |
| Custom / Enterprise | Defined with you directly |
Extending retention
Going beyond your plan’s default window — keeping events longer, or storing a higher volume — is a licensed capability. It’s available on Enterprise plans, or when you self-host with a license; it isn’t a self-serve toggle on the standard Cloud tiers. On Enterprise, extended storage is priced from €3 per GB and configured as part of your agreement, so you only pay for the additional storage you actually use. Self-hosted deployments with a license configure retention directly in the platform. This keeps the model predictable: your base plan covers normal usage at its default window, and longer or higher-volume retention is unlocked through an Enterprise agreement or a self-hosted license.To extend retention beyond your plan default, reach out to your contact or enterprise@langwatch.ai. Self-hosting? See the self-hosting docs to configure retention with a license.
Frequently asked questions
How does pricing behave as I scale up?
How does pricing behave as I scale up?
There are no sudden pricing jumps tied to volume. LangWatch is designed so teams can track all agent activity, run continuous evaluations, and scale to production workloads without their bill spiking. Seats scale with team size, and event pricing stays extremely low — because reliable AI is built collaboratively, we focus pricing on collaboration and keep usage costs minimal so growth is never discouraged.
Is there a free plan?
Is there a free plan?
Yes. You can start for free with LangWatch Cloud, no credit card required. The free plan gives you immediate access to all core features — evaluations, monitoring, and agent simulations. It’s ideal for developers who want to experiment or run small-scale testing.
What if I'm working with sensitive data from the start?
What if I'm working with sensitive data from the start?
Run LangWatch locally on your own machine. All features are available from our open-source repository, so you can build with sensitive data without it leaving your environment.
What counts as a billable event?
What counts as a billable event?
A billable event is either a span within a trace or a scenario run used to test your AI agents. Pricing is based on the total number of ingested events per billing period.
Can I customize how long my data is retained?
Can I customize how long my data is retained?
Each plan includes a default retention window (see the table above). Extending it — a longer window or a higher volume of stored events — is available on Enterprise plans or when you self-host with a license. Reach out to enterprise@langwatch.ai to set this up.
Can I self-host or run a hybrid setup?
Can I self-host or run a hybrid setup?
Yes. LangWatch is available both self-hosted and hybrid. With the hybrid option you get the convenience of running on our Cloud while your data stays on your side. See the self-hosting docs or reach out for more information. You can run the self-hosted version for free. If you require enterprise features such as SSO, RBAC, SCIM, or a support SLA, reach out to us.
Where is my data stored?
Where is my data stored?
For LangWatch Cloud, data is stored securely in the EU. For the US, Pacific, and other regions, contact us at contact@langwatch.ai and we’ll meet your requirements. For Enterprise users, we offer on-premise options so your data stays entirely within your own infrastructure — nothing leaves your environment.
Do you support custom contracts and procurement reviews?
Do you support custom contracts and procurement reviews?
Yes. We know procurement and legal teams often have their own review processes. For Enterprise and regulated-industry plans, we support custom contracting and custom workflows.
Is LangWatch secure and compliant?
Is LangWatch secure and compliant?
LangWatch is ISO 27001 and GDPR compliant. Enterprise customers can request our security documentation, pentest results, and vendor assessments. For more, see langwatch.ai/security.
Can my security team review your security documentation?
Can my security team review your security documentation?
Yes. Your security team can access the full set of LangWatch security documentation, including:
- Pentest report — performed by a CREST-certified third-party security firm, covering LangWatch Cloud and hybrid setups.
- Data flow & architecture diagrams — including deployment models, encryption protocols (in-transit and at-rest), and data boundaries.
- Latest ISO 27001 reports — covering more than SOC 2.