Langfuse
Open-source platform for tracing, evaluating, and managing prompts in LLM applications
| What is it | Open-source platform for tracing, evaluating, and managing prompts in LLM applications |
|---|---|
| Pricing | Freemium — from $29/mo |
| Free tier | Yes |
| Platform | Web Application |
| API | Yes |
| Works with | n8n |
| Best for | Debugging complex LLM application workflows, Testing and improving prompt effectiveness |
| Domain registered | 2023 |
Data updated Aug. 1, 2026
What does Langfuse do?
Langfuse is an open-source platform designed to help developers build, monitor, and improve applications that use large language models. It provides detailed tracing capabilities that let you see exactly how your LLM calls are performing, including latency, costs, and token usage. You can track complex workflows involving multiple LLM calls and see the entire chain of events in a visual interface.
The platform includes tools for evaluating your LLM applications through both automated testing and human feedback collection. It also offers prompt management features that allow teams to version, test, and deploy prompts collaboratively. Langfuse provides SDKs for multiple programming languages and can be self-hosted or used as a cloud service.
Langfuse is particularly useful for development teams working on AI-powered products that rely on language models. It helps identify performance bottlenecks, optimize prompt effectiveness, and ensure consistent quality in production applications. Teams can use it to monitor customer-facing LLM features, debug issues quickly, and systematically improve their AI applications over time.
Key features
What makes it stand outWho is Langfuse for?
Who benefits most from this toolPricing
Free tier available — start without a credit cardHobby
- 2 users
- 50,000 units per month
- 30 data access days
- All platform features (with limits)
- 50k units / month included
- 30 days data access
- 2 users
- Community support via GitHub
Core
Everything in Hobby, plus:
- unlimited users
- 100,000 units per month
- 90 data access days
- Everything in Hobby
- 100k units / month included
- 90 days data access
- Unlimited users
- In-app support
Pro
Everything in Core, plus:
- 100,000 units per month
- 1,095 data access days
- Everything in Core
- 100k units / month included
- 3 years data access
- Data retention management
- Unlimited annotation queues
- High rate limits
- SOC2 & ISO27001 reports, BAA available (HIPAA)
- Prioritized in-app support
Enterprise
Everything in Pro, plus:
- 100,000 units per month
- Everything in Pro + Teams
- 100k units / month included
- Audit Logs
- SCIM API
- Custom rate limits
- Uptime SLA
- Support SLA
- Dedicated support engineer
Trust & presence
Gallery
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