Langfuse

Developer Toolslangfuse.com

Open-source LLM engineering platform

Developer ToolsOpen SourceFree tier
Rating
4.1 ★★★★★
0 reviews
Views
443
total views
Saved
715
users saved
Pricing
Free cloud; Pro $59/mo; Self-hosted free
Free tier available
Platform
Web · Self-hosted · Python
API available

Overview

Langfuse — Open-source LLM engineering platform

Langfuse is an open-source LLM engineering platform for tracing, evaluation, prompt management, and metrics. It integrates with LangChain, LlamaIndex, and any LLM framework. Its self-hosting option makes it popular for teams with strict data privacy requirements.

LLM tracing

Evaluation framework

Prompt management

Self-hosting option

Features & capabilities

Everything it does, in plain English.

FeatureLLM tracingIncluded
FeatureEvaluation frameworkIncluded
FeaturePrompt managementIncluded
FeatureSelf-hosting optionIncluded
FeatureFramework integrationsIncluded
API AccessProgrammatic access available for developers.Available
PlatformsWeb · Self-hosted · Python

The honest take

Where it shines, where it stumbles.

✓ Pros

  • Open-source and self-hostable
  • Framework agnostic
  • Good evaluation tools

! Watch-outs

  • !Self-hosting requires setup
  • !Smaller community than LangSmith

Who it's for

Where Langfuse pays for itself fast.

— Use case
LLM observability
— Use case
Evaluation datasets
— Use case
Prompt versioning
— Use case
Cost analysis

Community reviews

Share your take on Langfuse

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4.1
0 reviews
5★
11
4★
2
3★
1
2★
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1★
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P
Patrick D. ✓ Verified
Copywriter · GitLab
2 months ago
Exceptional quality and value
Exceeded all my expectations. The onboarding flow was smooth and I was productive from day one. Works consistently across all my devices and browsers. The API is well-documented and easy to work with. Five stars — no hesitation.
P
Patrick K. ✓ Verified
ML Engineer · Stripe
3 months ago
Incredible — highly recommend
Can't imagine working without it now. The onboarding flow was smooth and I was productive from day one. It integrates well with VS Code / Slack / Notion — my daily drivers. It integrates well with VS Code / Slack / Notion — my daily drivers. Definitely worth trying.
P
Patrick W.
Director of Product · Microsoft
5 months ago
The best product I've used
Can't imagine working without it now. I've recommended this to at least 10 colleagues already.
V
Victoria P.
DevOps Engineer
5 months ago
Exactly what I needed
Game changer for my workflow. The collaboration features are genuinely well thought-out.
J
Jason W. ✓ Verified
ML Engineer · Meta
7 months ago
Useful and reliable
Works really well for my use case. The collaboration features are genuinely well thought-out. Integration with my existing tools was seamless — no friction at all. A few missing integrations I'd like to see added.
T
Tom J. ✓ Verified
ML Engineer · a marketing agency
7 months ago
The best tool I've used
Exceeded all my expectations. The collaboration features are genuinely well thought-out. My team is very happy with the results.
V
Victoria P. ✓ Verified
Design Lead · a media company
7 months ago
Good for some things, not others
Mixed feelings, but ultimately positive. Integration with my existing tools was seamless — no friction at all. The interface is intuitive enough that I didn't need to read any docs. Customer support response times could be faster.
C
Chelsea L. ✓ Verified
Staff Engineer · a fintech company
9 months ago
Exactly what I needed
Game changer for my workflow. The ROI was clear within the first week of using it. The outputs require minimal editing — saves so much back-and-forth. Customer support responded within hours and solved my issue.
W
Wei S. ✓ Verified
Entrepreneur · Uber
1 years ago
A must-have for any professional
Absolutely love this tool. I've tried 5 similar tools and this one is clearly the best in class. The customization options let me tailor it to my exact workflow.
K
Kyle L. ✓ Verified
Product Manager · Atlassian
1 years ago
Changed how I work completely
Absolutely love this tool. Reduced the time I spend on this task by about 70%. Customer support responded within hours and solved my issue. Best tool in this category, hands down.
C
Carlos R. ✓ Verified
Backend Engineer · GitHub
1 years ago
Best in class, no question
Best-in-class, period. Integration with my existing tools was seamless — no friction at all. Looking forward to seeing how it improves.
V
Victoria S. ✓ Verified
PhD Candidate · a healthcare startup
1 years ago
Incredible — highly recommend
Seriously impressive. The ROI was clear within the first week of using it.
N
Nicole M. ✓ Verified
Tech Lead · Figma
1 years ago
Exactly what I needed
Absolutely love this tool. Integration with my existing tools was seamless — no friction at all. Would recommend to anyone in my industry.
A
Alicia H. ✓ Verified
Data Analyst · Vercel
1 years ago
Good value, works well
Mostly great, minor complaints. Works consistently across all my devices and browsers. A few missing integrations I'd like to see added. My team is very happy with the results.

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