Langfuse

Open-source platform to trace, evaluate and improve LLM applications and agents

Freemiumlangfuse.comUpdated 8 Nov 2026

About Langfuse

Langfuse is an open-source LLM engineering platform for tracing, evaluating and improving AI applications and agents. It records hierarchical traces of model calls, tool invocations and retrieval steps, and lets teams filter them by user, session, cost, latency or metadata. Around that tracing layer it provides prompt management, evaluation (LLM-as-a-judge, heuristic checks and human annotation), datasets and experiments, a playground, and dashboards with alerts for cost and latency.

Best for

Production tracing and debugging of LLM apps and agents, prompt versioning, and systematic evaluation on real data
Production Agent Debugging: Inspect nested traces of LLM calls and tool use to find the step causing errors, latency or cost spikes.
Prompt Versioning: Manage prompts outside the codebase and roll deployments back without a redeploy.
Evaluation on Real Data: Score production traces with LLM-as-a-judge or human review and build golden datasets for regression tests.
Self-Hosted LLM Observability: Keep trace data in your own infrastructure for data residency or compliance requirements.
Cost Monitoring: Track token cost and latency by user, session or model and alert on anomalies.

Not ideal for

Non-technical users, or teams that want a fully managed tool with no instrumentation work

Popular with

AI Engineers
Software Developers
ML Engineers
Product Teams
Enterprises building LLM applications

Key features

Tracing
Evaluation
Prompt Management
Playground
Datasets and Experiments
Cost and Latency Dashboards
Open-Source Self-Hosting
APIs and MCP Servers

Pros and cons

Pros

MIT-licensed core with free self-hosting, avoiding vendor lock-in.
Covers tracing, prompt management and evaluation in one platform.
Free Hobby tier with 50k units per month and no credit card required.
Over 100 integrations, plus OpenTelemetry for languages without a native SDK.
Core plan at $29/month with unlimited users.

Cons

Hobby is limited to 2 users and 30 days of data access.
SOC 2, ISO 27001 and HIPAA support start at the $199/month Pro plan, and SSO and RBAC need a $300/month add-on.
Audit logs, SCIM and SLAs are restricted to the $2,499/month Enterprise plan.
Usage-based unit overage adds cost for high-volume tracing.

Pricing

Plans as listed by the vendor on 8 Nov 2026. Check their site for current prices.

See langfuse.com

Hobby

Free cloud tier for individuals and early projects

50k units/month
30 days data access
2 users
community support

Core

$29/month

Paid tier for small production teams

100k units/month included
90 days data access
unlimited users
in-app support

Pro

$199/month

Teams needing long retention and compliance reports

100k units/month included
3 years data access
data retention management
SOC 2 and ISO 27001 reports
HIPAA BAA available
high rate limits

Enterprise

$2,499/month

Large organizations with security and support requirements

Everything in Pro
audit logs
SCIM API
uptime and support SLAs
named lead support engineer
invoice or AWS Marketplace billing

Our ratings

Scored out of 10 by the Finder Atlas editorial team.

8.4overall

Ease of Use: 7.8
Feature Depth: 8.8
Value for Money: 8.7
Performance & Speed: 8.4
Documentation & Support: 8.5

Platforms and integrations

Available on

Works with

LangChain
Vercel AI SDK
LiteLLM
Pydantic AI
Google ADK
CrewAI
LlamaIndex
OpenAI Agents
Mastra
OpenAI
Anthropic
Amazon Bedrock

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Release history

Jan 1, 2026
ClickHouse announced it acquired Langfuse; Langfuse remains open source with Cloud continuing as a standalone service
ClickHouse announced it acquired Langfuse; Langfuse remains open source with Cloud continuing as a standalone service.

Reviews

No reviews yet

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Frequently asked questions

Is Langfuse open source?

Yes. Langfuse is MIT licensed and free to self-host. ClickHouse said after acquiring the company that core features remain under the MIT license.

Who owns Langfuse?

ClickHouse announced the acquisition of Langfuse in January 2026, alongside its Series D round. ClickHouse says Langfuse Cloud keeps operating as a standalone service with the same SLAs and support.

What counts as a unit on Langfuse Cloud pricing?

Plans are metered in units of ingested data. Hobby includes 50k units per month, and Core, Pro and Enterprise include 100k, with overage billed per 100k units.

Which languages and frameworks does Langfuse support?

Python and TypeScript have native SDKs, and Go, Java, .NET, Ruby, PHP and Swift can send data via OpenTelemetry. Integrations include LangChain, LlamaIndex, Vercel AI SDK, LiteLLM, OpenAI and many others.

Does Langfuse offer discounts?

Yes. Early-stage startups get 50% off the first year, research and students can get up to 100% off with limits, non-profits get $199 in monthly credits, and open-source projects get $300 in monthly credits for the first year.

Can I self-host Langfuse?

Yes. Docker Compose is suggested for local setups, and Kubernetes (Helm) and Terraform templates cover production deployments on AWS, GCP and Azure.

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