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Langfuse

Langfuse provides observability and analytics for LLM applications, enabling prompt tracking, evaluation, and debugging. · Langfuse · Observability

Overview

Langfuse offers a free Hobby plan for LLM observability, with 50,000 units a month and 30 days of data access, letting you track, debug, and analyze prompt chains and outputs.

Good fit

Use Langfuse when you need to monitor, debug, or analyze LLM application behavior and prompt performance.

  • LLM developers
  • AI startups
  • teams building with GPT-4
  • prompt engineers

Not a fit

Avoid if you require observability for non-AI workloads or need more than 50,000 units a month or longer data access without upgrading.

  • You need observability for traditional apps
  • You require more than 50,000 units a month
  • You need enterprise SLAs on the free tier
Quickstart · 5 steps
  1. Sign up for a free Langfuse account.
  2. Create a new project in the Langfuse dashboard.
  3. Integrate the Langfuse SDK into your LLM application.
  4. Send traces and events from your app to Langfuse.
  5. View analytics and traces in the dashboard.

Other free observability options

Datadog · Observability
Up to 5 hosts (Free plan) · 1-day metric retention (Free plan) · 14-day free trial of Pro/Enterprise features
Billing risk: None
No card
New Relic · Observability
100 GB/month data ingest · Unlimited basic users, 1 full platform user · 500 synthetic checks/month
Billing risk: None
No card
Sentry · Observability
5,000 errors/month · 5 GB logs and metrics/month · 5M spans/month
Billing risk: None
No card
UptimeRobot · Observability
50 monitors · 5-minute check interval
Billing risk: None
No card