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Langfuse vs Opik

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors.

The short answer

Cheaper paid plan
Opik — $19/mo vs $29/mo for Langfuse
Free plan
Both have one
Public API
Both have one
Higher Trust score
Opik — 98 vs 80 for Langfuse
Best fit
Langfuse: Engineering teams running LLM apps or agents in production who need traces and cost tracking · Opik: Developers who want to self-host LLM tracing and evaluation under Apache-2.0

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

LangfuseOpen-source LLM engineering platform for tracing agents, versioning prompts, running evals and tracking cost, hosted or self-hosted.OpikOpen-source platform from Comet for tracing, testing and monitoring LLM applications and agents, self-hosted or in the cloud.

Side by side

FactLangfuseOpik
CategoryLLM Observability & EvaluationLLM Observability & Evaluation
Pricing modelFreemiumFreemium
Starts at$29/mo$19/mo
Public APIYesYes
Trust score80 / 10098 / 100
PlatformsWeb, APIWeb, API
CompanyLangfuse GmbHComet ML, Inc.
Launched2023—
Last verifiedOct 29, 2026Oct 2, 2026

What our research says

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

Opik

Opik is a solid pick for teams that want tracing and evaluation for LLM apps without being locked into a closed service, since the open-source code matches the hosted product. The $19 Pro plan is cheap for a small team, and the test-suite approach makes regression checks approachable. It overlaps heavily with Langfuse and LangSmith, so the choice often comes down to your stack and hosting preference.

Pros

  • Open-source codebase that matches the hosted version
  • Covers tracing, evaluations, annotation and production monitoring in one product
  • Integrates with 40+ frameworks and model providers plus OpenTelemetry
  • Free cloud plan with 25k spans a month and a $19 Pro tier

Cons

  • Cloud plans are metered in spans, so chatty agents can hit limits quickly
  • Free and Pro plans keep data for 60 days
  • SSO, service accounts and compliance coverage need the Enterprise plan

Which one fits

Choose Langfuse if you need

  • 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

Choose Opik if you need

  • Developers who want to self-host LLM tracing and evaluation under Apache-2.0
  • Small teams that need agent tracing and regression tests for a few dollars a month
  • Teams that already use Comet for experiment tracking

Langfuse vs Opik: the questions people ask

Is Langfuse cheaper than Opik?

On published entry prices, Opik starts lower — $19/mo against $29/mo for Langfuse. Entry price is the lowest paid plan as we last verified it; what each plan includes differs.

Does Langfuse or Opik have a free tier?

Both: Langfuse has a free tier, and Opik has a free tier.

Which has a public API, Langfuse or Opik?

Both ship a public API, so either can be built on; the fact table above shows the platforms each one runs on.

More comparisons

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