Langfuse

Name: Langfuse
Brand: Langfuse (acquired by ClickHouse)
Price: 29 USD
Availability: InStock

Langfuse (acquired by ClickHouse), United States, langfuse.com

An open-source (MIT) LLM engineering platform for call tracing, cost, prompt management and evaluation of LLM apps in one place

Developer Tools

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CurrencyUSD KRW EUR

Personal starting price$29+Official site price

Free tierFree plan available

Korean supportLimited

Information updated 2026-10-20, source: official site and public reports. Prices and benefits may change. Check the official site before you pay.

Pros

MIT open source/free self-hosting (all core features)
Tracing/token/cost aggregation
Prompt version management/playground
LLM-as-judge/dataset evaluation
Free cloud plan

Cons

A developer tool, so hard for non-developers
The cloud charges extra when units are exceeded
No Korean interface

These are opinions compiled by Pickx from public sources.

Cautions

The usage unit is 'units' (traces, observations and so on), with overage charged at $8 per 100k. SSO/RBAC need the Teams add-on ($300 per month) or Enterprise. ClickHouse acquired it, and it was officially announced that it will remain open source with no plans to change the license

At a glance

Langfuse is an open-source platform that tracks which prompts an LLM app used to call which models and how much cost/latency there was, and also handles prompt management and quality evaluation. It suits development teams running AI features in real services. You can use it in the cloud (a free plan exists) or self-hosted (MIT, free).

Main features/supported AI

Feature/model	Description	Notes
Tracing	Agent traces/graphs, per session/user, token/cost tracking, multimodal
Prompt Management	Prompt versioning, deployment, caching, playground
Evaluation	Online/offline evaluation, datasets/experiments, LLM-as-judge, human annotation queues
Metrics	Custom dashboards/alerts	Langfuse v4+
Integrations	Python/JS SDK, OpenTelemetry, LiteLLM proxy logging, public API	Works with any model provider

Plans

Plan	Price (monthly billing / yearly billing)	What you can do/limits	Features
Hobby (cloud)	Free	50,000 units per month, 30 days of data, 2 users	For personal projects
Core	$29 Yearly billing discount needs checking	100,000 units per month included ($8 per extra 100,000), 90 days of data, unlimited users
Pro	$199 Needs checking	100,000 units per month included, 3 years of data/retention policy management	Teams add-on $300/mo (SSO/RBAC)
Enterprise (cloud)	$2,499 Annual commitment possible	100,000 units per month included, 3 years of data	Custom volume pricing
Self-hosted Open Source	Free	All core features, unlimited projects/users	MIT license
Self-hosted Enterprise	Quote	Admin API, project RBAC, retention policies, audit logs, SCIM, dedicated support	SOC 2/ISO 27001 reports

Who it suits

Hobby: Developers who want to record the calls/costs of a personal AI project for free
Core: When a small team wants to manage the cost/quality of AI features in operation
Self-hosted Open Source: Companies that cannot send log data outside

Compared with similar services

Langfuse vs LangSmith: LangSmith is a commercial service centered on the LangChain ecosystem, while Langfuse is MIT open source and free to self-host
Langfuse vs LiteLLM: LiteLLM is a gateway that relays/controls model calls, while Langfuse is an observability tool that records/analyzes/evaluates calls (they can be used together)
Langfuse vs Helicone: Both are LLM observability tools, and Langfuse has a wider range of prompt management/evaluation features

Notes

Information checked: 2026-10-20
Langfuse official pricing (cloud)
Langfuse self-hosting pricing
Langfuse joins ClickHouse (official blog)

Good for

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Prices converted at 1 USD = ₩1,329.49 (2026-10-19). Original price shown in brackets. Taxes as listed by each provider.

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