Langfuse

The open source
LLM engineering platform.

System Normal
SOC2 TYPE II ISO 27001
CORE
Observability

Detailed traces for every request. Debug complex chains in seconds.

100%
OSS
Self-Hosted

Keep data on your infrastructure. Docker ready. MIT License.

$0/mo
CLOUD
Managed Cloud

Generous free tier. No maintenance. Enterprise ready security.

50k
GET STARTED npm install langfuse
Platform capabilities

Everything you need
to build reliable AI.

Cost Tracking

Monitor OpenAI and Anthropic costs in real-time. Breakdown spend by user, model, or feature.

Debug Canvas

Replay complex agent steps. Visualize the execution path and identify latency bottlenecks instantly.

Prompt Management

Decouple prompts from code. Manage versions, deploy instantly, and A/B test without redeploying.

Enterprise Security

SSO, Role-based access control, and data residency options. Compliant with GDPR and HIPAA.

Alerts & Incidents

Get notified via Slack or PagerDuty when error rates spike or latency exceeds thresholds.

Python & JS SDKs

Fully typed, async-first SDKs. Integrates with LlamaIndex, LangChain, and OpenAI SDK seamlessly.

Start for free

Simple, transparent pricing.

Monthly
Yearly -20%
Hobby
For side projects and learning.
$0/mo
50k traces / month
1 user seat
7 day data retention
Community Support
Most Popular
Pro
For startups and small teams.
$59/mo
100k traces / month
5 user seats
90 day data retention
Prompt Management
Evaluations
Enterprise
For large scale production.
Custom
Unlimited traces
Unlimited seats
SSO & SAML
Dedicated VPC
SLA Support