Langtrace.ai

Open-source observability platform for monitoring and evaluating AI agents and LLM applications

Verified API available Free tier
Quick facts
What is it Open-source observability platform for monitoring and evaluating AI agents and LLM applications
Pricing Freemium — from $31/mo
Free tier Yes
Platform Web Application
API Yes
Best for Monitoring AI agent performance, Tracking LLM application costs
Domain registered 2024

Data updated Aug. 1, 2026

What does Langtrace.ai do?

Langtrace.ai is an open-source observability and evaluation platform specifically designed for AI agents and large language model applications. It provides developers with comprehensive monitoring capabilities to track the performance, costs, and accuracy of their AI systems in real-time. The platform captures detailed metrics including token usage, inference latency, error rates, and operational costs across various AI frameworks and providers.

The tool stands out with its minimal setup requirements – developers can integrate it with just two lines of code using Python or TypeScript SDKs. It supports popular AI frameworks including CrewAI, DSPy, LlamaIndex, and Langchain, along with a wide range of LLM providers and vector databases. The OpenTelemetry-compatible dashboard offers deep visibility into AI system performance, helping teams identify bottlenecks and optimize their applications.

Langtrace.ai primarily benefits development teams building production-grade AI applications who need to monitor performance, control costs, and ensure reliability. It's particularly valuable for enterprises scaling AI solutions, helping them track token consumption budgets, maintain latency thresholds, and evaluate model accuracy over time. The platform enables data-driven decisions about model selection, prompt engineering, and system architecture based on actual performance metrics rather than guesswork.

#ai agents#ai observability#developer tools#evaluation platform#llm monitoring#open source#performance tracking

Key features

What makes it stand out
01
Tracks token usage, cost, latency and accuracy metrics for AI applications
02
Supports popular frameworks like CrewAI, DSPy, LlamaIndex and Langchain
03
Simple SDK integration with just 2 lines of code in Python or TypeScript
04
OpenTelemetry-compatible dashboard for comprehensive observability
05
Wide support for LLM providers and VectorDBs out of the box

Who is Langtrace.ai for?

Who benefits most from this tool
Monitoring AI agent performance
Tracking LLM application costs
Debugging and optimizing AI systems

Pricing

Free tier available — start without a credit card

Free Forever

Free
  • 5,000 spans per month
  • Tracing & Metrics
  • Annotations & Dataset Curation
  • Evaluations

Growth

$31.0/month

Everything in Free Forever, plus:

  • 500,000 spans per year
  • 0 additional cost per span
  • Everything in Free forever
  • Evaluations in the cloud
  • Priority support

Enterprise

Custom
  • Custom retention policy
  • Custom SLAs
  • SOC 2 Type II Compliance

Trust & presence

Domain Domain registered 2024

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