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Langfuse

Open-source, self-hostable tracing and evaluation platform for LLM applications.

Langfuse is an open-source AI engineering platform for tracing, evaluating, and managing prompts in LLM applications. It combines observability, datasets, experiments, and collaborative human review around production agent data.

Best for
Teams building and improving production-grade LLM applications

What we checked

Pages last read
Facts checked
18 factsFrom 12 sources
AI answers
Named in 0 of 151Our October check

How we checkEditorial policy

Visit Langfuse CompareAlternatives

What we checked on Langfuse

YesPartlyNo

How much it does unattendedPartly

Agent permissions

Halo pauses before changing data or configuration, though a conversation can enable Always approve.

Halo pauses for your approval before changing data or configuration. Always approve lets a tool run without asking again in the current conversation.

langfuse.com/docs/api-and-data-platform…Checked

Which models it runs onYes

Model choice

The vendor positions Langfuse as model-agnostic, with integrations spanning providers and agent frameworks.

Langfuse is also open source, based on OpenTelemetry for interoperability, self-hostable at the same scale as Langfuse Cloud, and model- and…

langfuse.com/pricingChecked

Whose machine it runs onYes

Self-hosted

The open-source platform can be deployed on customer infrastructure using Docker and production deployment options.

Langfuse is open source and can be self-hosted using Docker on your own infrastructure.

langfuse.com/self-hostingChecked

Whose machine it runs onYes

Open source

Langfuse publishes its platform as open-source software and explicitly presents it as self-hostable and extensible.

Langfuse is open, self-hostable, and extensible.

langfuse.com/docsChecked

Whose machine it runs onYes

Licence

All product features are MIT licensed, so companies may fork, modify, and contribute to the software.

MIT license — all product features are MIT licensed, scale to billions of monthly events, and you can fork, modify, and contribute.

langfuse.comChecked

Building with itYes

SDK languages

Native SDKs are available for Python and JavaScript or TypeScript, with other languages supported through OpenTelemetry.

Python and TypeScript native SDKs, plus Go, Java, .NET, Ruby, PHP, and Swift via OpenTelemetry.

langfuse.comChecked

Building with itYes

Tracing and evals

The platform traces LLM calls and workflow steps, then evaluates production data with datasets and experiments.

One integrated platform to trace, manage prompts, evaluate, and experiment from prototype to production scale.

langfuse.comChecked

What it costs to runYes

How it meters

Cloud pricing combines a monthly plan fee with usage measured as ingested traces, observations, and scores.

Langfuse pricing is based on the number of ingested units per billing period. Units are either traces, observations or scores.

langfuse.com/docs/administration/billab…Checked

What it costs to runYes

Free tier

The standing Hobby plan is free, requires no credit card, and includes limited platform usage.

Get started, no credit card required. Great for hobby projects and POCs.

langfuse.com/pricingChecked

What it costs to runYes

MCP server

A native authenticated MCP server lets AI assistants and agents interact programmatically with project data.

Langfuse includes a native Model Context Protocol (MCP) server that enables AI assistants and agents to interact with your Langfuse data…

langfuse.com/docs/api-and-data-platform…Checked

What it costs to runYes

Bring your own key

Self-hosted deployments can connect their own LLM API or gateway, including within a private VPC.

Bring your own LLM API; it can also run in the same VPC or a peered VPC.

langfuse.com/self-hostingChecked

Buying it for a teamYes

A company can buy it

Cloud plans include production, scaling, and Enterprise options designed for projects with unlimited users.

For production projects. Longer data access and unlimited users.

langfuse.com/pricingChecked

Buying it for a teamYes

Admin controls

Role-based controls restrict project configuration, while project API keys can be narrowed to specific permissions.

Choose a set of permissions under Permissions when creating a project API key to limit what the key can do.

langfuse.com/docs/administration/rbacChecked

Buying it for a teamPartly

Audit log

Immutable, attributed audit trails are available on Enterprise cloud and self-hosted Enterprise Edition only.

On the page: Audit Logs availability table

langfuse.com/docs/administration/audit-…Checked

Buying it for a teamPartly

Single sign-on

Enterprise SSO is OIDC-only and requires the Pro Teams Add-on or an Enterprise or self-hosted deployment.

On the page: Enterprise SSO & SSO Enforcement availability table

langfuse.com/docs/administration/authen…Checked

What happens to your codeYes

Data residency

Cloud customers choose US, EU, Japan, or HIPAA regions, while self-hosting offers infrastructure control.

US — Oregon (AWS us-west-2); EU — Ireland (AWS eu-west-1); Japan — Tokyo (AWS ap-northeast-1); HIPAA — Oregon (AWS us-west-2).

langfuse.com/security/data-regionsChecked

What happens to your codeYes

Getting out

Observability data can be batch-exported as CSV or JSON; published pages do not address unused-credit expiry.

Most tables in Langfuse support batch-exports. All filters applied to the table will be applied to the export.

langfuse.com/docs/api-and-data-platform…Checked

What happens to your codeYes

Certifications

Langfuse documents GDPR compliance across the service, with SOC 2 and ISO 27001 audit coverage.

Langfuse Cloud is SOC 2 Type II certified, ISO 27001 compliant, GDPR compliant, and offers a HIPAA-ready region.

langfuse.comChecked

Langfuse price and terms

Terms

Free plan
YesYesHobby is a standing free plan with 50k units per month, two users, and 30 days of data access

What needs a higher plan

Enterprise
Audit log

For AI agents

MCP server
Yes
Langfuse's pricing page

Pricing page, captured

langfuse.com/pricing, checked

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Langfuse alternatives

1 alternative

Questions about Langfuse

How much does Langfuse cost?
Langfuse is free to use. From langfuse.com/pricing, checked 29 October 2026.
Does Langfuse have an API or an MCP server?
It has an MCP server.
Is Langfuse open source, and can you host it yourself?
It is open source. You can host it yourself.
What have we checked on Langfuse?
18 facts, under these headings: How much it does unattended, which models it runs on, whose machine it runs on, building with it, what it costs to run, buying it for a team, what happens to your code.
How do we check Langfuse?
We hold 18 facts on Langfuse, quoted from 12 pages. Facts and price last checked 29 October 2026.

How we check every listing

Sources and changes

Last changed

Sources on langfuse.com12

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