Website-checked tool profile

Langfuse

Open-source tracing, prompt management and evaluations for LLM applications and agents.

Sources checked Sep 26

Pricing: Cloud Hobby is free, Core is $29/month, Pro is $199/month and Enterprise is $2,499/month. Open-source self-hosting is free; enterprise self-hosting is custom-priced. Official source 1 ↗ · Official source 2 ↗
Available as: Instrument applications through OpenTelemetry, with native Python and TypeScript SDKs. Official source 1 ↗
Primary group: Coding & Development

What it does

Langfuse combines tracing, prompt management, evaluation and experiments for AI agents and applications.

Hierarchical traces. Inspect LLM calls, tool invocations and retrieval steps by user, session, cost, latency or metadata. Official source 1 ↗
Output evaluation. Use LLM judges, heuristic functions or human reviewers on production data and experiments. Official source 1 ↗
Prompt management. Separate prompts from application code and deploy or roll back prompt versions. Official source 1 ↗
In-app assistant. Investigate production data and turn findings into approved actions inside Langfuse. Official source 1 ↗

FreeMonthly allowance

50,000 units per month, 30-day data access, two users and community support. Official source 1 ↗

$29Per month plus additional units

100,000 units, 90-day data access, unlimited users and in-app support. Extra usage starts at $8 per 100,000 units. Official source 1 ↗

$199Per month plus additional units

100,000 units, three-year data access, retention management and unlimited annotation queues; optional Teams add-on is $300/month. Official source 1 ↗

$2499Per month; optional annual commitment

Pro and Teams features, 100,000 units, audit logs, SCIM, custom limits, uptime/support SLAs and named support engineer. Official source 1 ↗

Free software licenseOwn infrastructure

MIT-licensed core observability, evaluations, prompts, datasets and APIs; deployment remains your responsibility. Official source 1 ↗

Custom quoteAdditive to a ClickHouse commercial plan

Dedicated deployment with management APIs, project RBAC, retention policies, audit logs and support. Official source 1 ↗

Paid cloud tiers include 100,000 units, then charge $8 per 100,000 additional units with volume discounts. Official source 1 ↗

Cloud Hobby includes 50,000 units per month, 30 days of data access and two users. Official source 1 ↗

A team running chat agents can monitor multi-turn quality, cost and resolution together. Official source 1 ↗

Cloud history limits. Hobby retains accessible history for 30 days, Core for 90 days and Pro for three years. Official source 1 ↗