Langfuse
Verified Oct 29, 2026 ActiveOpen-source LLM engineering platform for tracing agents, versioning prompts, running evals and tracking cost, hosted or self-hosted.
Listed on EffectHub ·
Pricing
- Pricing model
- Freemium
- Paid options from
- $29/mo
- Billing
- Monthly
Cloud Hobby is free with 50k units a month, 30 days of data and 2 users. Core is $29 a month and Pro $199 a month, each with 100k units included and $8 per additional 100k units; Enterprise starts at $2,499 a month, and a Teams add-on for SSO and RBAC is $300 a month. Self-hosting the open-source version is free.
Use tool ↗About Langfuse
Langfuse records traces of LLM applications and agents, including nested tool calls, sessions, users, token usage and cost, through Python and JavaScript SDKs, OpenTelemetry and integrations with common frameworks. On top of the traces it offers versioned prompt management with release labels and a playground, datasets and experiments, LLM-as-judge and human annotation queues for evaluation, custom dashboards and alerts. The core is MIT-licensed and can be self-hosted with Docker Compose, Kubernetes or Terraform, while Langfuse Cloud runs in US, EU and Japan regions. Langfuse GmbH was founded in Berlin in 2023 and was acquired by ClickHouse in January 2026; the team says licensing, the cloud service and the roadmap continue unchanged.
- Platforms
- Web · API
- API
- Yes
- Last verified
- Oct 29, 2026
Verified sources
- Hobby free (50k units), Core $29/month, Pro $199/month, Enterprise $2,499/month, $8 per extra 100k units, Teams add-on $300/monthlangfuse.com ↗
- ClickHouse acquired Langfuse; remains open source and self-hostable, no licensing changes, cloud continueslangfuse.com ↗
- Langfuse GmbH, Berlin, Germanylangfuse.com ↗
- Self-hosted core is MIT licensed without usage limitslangfuse.com ↗
Is Langfuse legit?
We don’t label tools safe or unsafe. Below are the records we checked ourselves, each with the date we read it.
- TLS certificate
- Issued by Let's Encrypt, valid until Dec 16, 2026Seen in our own connection to the site on Oct 29, 2026
- Last checked
- Oct 29, 2026The site answered
- On the market since
- 2023The vendor's own material, read by us
- Operated by
- Langfuse GmbH, GermanyOur research, card verified Oct 29, 2026
Pros & cons of Langfuse
Langfuse is a strong default for teams that want tracing, prompt versioning and evaluations in one open-source tool, with the option to keep data on their own infrastructure. Teams that only want a hosted logging proxy with no SDK work, or that need guaranteed enterprise SSO without paying for add-ons, may find simpler or more bundled options.
Pros
- MIT-licensed core that can be self-hosted without usage limits
- Covers tracing, prompt management, evaluation and dashboards in one product
- Generous free cloud tier and unlimited users from the $29 Core plan
- OpenTelemetry support and SDKs for Python and JavaScript
Cons
- Usage above the included 100k units is billed extra, so busy apps pay more than the headline price
- Free tier keeps only 30 days of data and two users
- Enterprise SSO and RBAC require the $300 Teams add-on on Pro or the Enterprise plan
Best for
- Engineering teams running LLM apps or agents in production who need traces and cost tracking
- Organisations that must self-host observability data for compliance
- Teams that want prompts, datasets and evals tied to the same traces
Not for
- Non-technical users looking for a no-code analytics dashboard
- Teams that need SSO and fine-grained RBAC on the cheaper cloud tiers
Watch out: Billing is by units (traces, observations and scores), not requests; high-volume agents with many nested steps consume units quickly at $8 per extra 100k.
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