Laminar

Laminar is an open-source observability platform for AI agents that helps debug LLM calls, track tool use, and run evaluations. It allows developers to trace, evaluate, and improve AI agents quickly.

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At a glance

Pricing

Freemium · Open Source

Free tier

Yes

API

Yes

Skill level

Technical

About

What is Laminar?

Laminar is an open-source observability platform designed for AI agents, enabling developers to trace, evaluate, and improve their AI applications. It provides a comprehensive suite of features to debug LLM calls, track tool usage, and run evaluations. Key functionalities include one-line tracing integration with AI frameworks, a true agent debugger for local development with in-browser debugging and prompt tuning, and session replay for browser agents. Laminar also offers powerful analysis tools like Signals to detect patterns across millions of traces and platform-wide SQL querying for all data. With robust evaluation capabilities, it helps verify progress, catch regressions, and iterate with confidence, making it an essential tool for developing and maintaining reliable AI agents.

Best used for

Ideal for developers who need to understand why their AI agent failed, iterate quickly on fixes, and detect patterns at scale. Especially valuable for debugging complex LLM interactions, tracking tool usage, and running comprehensive evaluations on AI applications to ensure reliability and performance.

Common actions

debug AI agents

trace LLM calls

evaluate AI performance

monitor AI applications

analyze agent behavior

Capabilities

Key features

Open-source platform
One-line agent tracing
Agent debugger
Session replay
Signals for pattern detection
SQL query all data
Robust evaluations

Target Audience

developer

Integrations

browser-usestagehandplaywrightkernelbrowserbase

Pricing & Plans

Freemium · Open Source · Starting at USD 0.00

$0/month (Free), $30/month (Hobby). Check lmnr.ai for detailed pricing.

FAQs

What are the pricing tiers for Laminar?

Laminar offers a Free tier with 1GB data and 15-day retention. The Hobby tier is $30/month for 3GB data and 30-day retention, while the Pro tier is $150/month. Additional data is available for $2 per GB on the Hobby plan.

Is Laminar truly open-source?

Yes, Laminar is fully open-source and Apache 2.0 licensed. It can be self-hosted anywhere, with setup instructions available for Docker in three lines and deployment options using Helm charts for broader environments.

How does Laminar help debug AI agents?

Laminar provides a true agent debugger that allows developers to run locally and debug in the browser. It enables rerunning at specific steps with preserved context, tuning system prompts, and instantly reflecting changes as they are saved, offering a comprehensive debugging experience.

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Open Source & Models Code Assistants No-Code / Low-Code Testing & QA Backend & APIs Prompt Engineering

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Also listed in

This tool also appears in

AI Agents & Automation › AI Frameworks & Infra

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