AI Governance Safety & Evaluation Freemium

LangWatch

Open-source testing, evaluation, and observability for production AI agents

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PricingFreemium
Starting price€29/core-seat/mo
Free planYes
Free trialYes
APIYes
Open sourceYes
DeploymentHybrid
Last verifiedAugust 3, 2026
Overview

Tool overview

LangWatch is listed under AI Governance Safety & Evaluation AI tools.

Summary

What is LangWatch?

LangWatch provides multi-turn simulations, evaluations, tracing, prompt management, voice testing, governance, and an AI gateway. Teams can use the managed cloud or self-manage the Apache-2.0 platform across development, CI, and production.

Best fit

Best for

Teams shipping AI agents that require repeatable quality gates

Audience

Who is it for?

AI engineersML platform teamsQA teamsAI governance teams
Recommendation

Decision note

Accepted with a 92/100 candidate score based on AI relevance, product availability, official source quality, user value, and category fit.

Capabilities

Key features

Multi-turn text and voice simulations

Offline and online evaluations

OpenTelemetry-native tracing

Prompt and governance controls

Workflows

Use cases

Test agents before release

Catch quality regressions

Trace multi-step failures

Monitor cost and latency

Strengths

Pros

  • Free forever developer tier
  • Entire platform is open source
  • Cloud and self-managed deployment
Considerations

Limitations

Agent testing quality depends on realistic scenarios, stable evaluators, representative datasets, and disciplined release gates. Self-managed installations require operational ownership, while Enterprise controls and support use custom terms.

Cost

Pricing details

Pricing modelFreemium
Starting price€29/core-seat/mo
Free planYes
Free trialYes
Pricing context

Billing options

Free foreverMonthly seat and event usageCustom Enterprise
Pricing context

Pricing note

Developer is free forever with 50,000 events monthly. Growth is €29 per core seat monthly, includes 200,000 events, then charges €5 per 100,000 events. Enterprise adds hybrid, self-hosted, or on-premises controls under custom terms.

View official pricing
Compatibility

Supported languages

  • English
Connectivity

Integrations

OpenTelemetry

Python SDK

TypeScript SDK

CI pipelines

AI gateways

Specs

Technical details

PlatformsWeb, API
Multilingual supportUnknown
Login requiredYes
Open sourceYes
LicenseApache-2.0
DeploymentHybrid
CompanyLangWatch
Editions / plansDeveloper Growth Enterprise
Data confidenceHigh
Last verifiedAugust 3, 2026
Documentation → Source code → Release notes → Data source →
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Answers

Frequently asked questions

LangWatch provides multi-turn simulations, evaluations, tracing, prompt management, voice testing, governance, and an AI gateway. Teams can use the managed cloud or self-manage the Apache-2.0 platform across development, CI, and production.
Teams shipping AI agents that require repeatable quality gates
The listed pricing model for LangWatch is Freemium. Pricing can change, so users should verify the latest plan details on the official website.
Yes. The current profile indicates that a free trial is available.
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