Langfuse vs Lunary

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

Entry price: Langfuse from $29/mo, Lunary from $20/seat/mo — different billing units, so no direct winner
Free plan: Both have one
Public API: Both have one
Best fit: Langfuse: Engineering teams running LLM apps or agents in production who need traces and cost tracking · Lunary: Small teams debugging agent traces and watching token spend
Trust score: About even — Langfuse 80, Lunary 83

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.

LunaryTracing, analytics and prompt versioning for LLM apps, with a self-hostable community edition.

Side by side

Fact	Langfuse	Lunary
Category	LLM Observability & Evaluation	LLM Observability & Evaluation
Pricing model	Freemium	Freemium
Starts at	$29/mo	$20/seat/mo
Public API	Yes	Yes
Trust score	80 / 100	83 / 100
Platforms	Web, API	Web, API
Company	Langfuse GmbH	Lunary LLC
Launched	2023	—
Last verified	Oct 29, 2026	Oct 16, 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

Lunary

A mid-weight alternative to the big observability suites: traces, cost analytics and prompt versioning without the platform tax, and a free self-hosted edition if you would rather keep traces in your own network. The cloud Team plan is priced per seat and capped at ten, so it fits a small team and then pushes you into a sales conversation.

Pros

Traces with error stacks and search, aimed at debugging multi-step agents
Cost, usage and user-satisfaction analytics with custom dashboards
Prompt templates with versioning and A/B testing
SDKs for OpenAI, Anthropic, Vertex, Azure and Mistral
Community edition self-hosts at no cost; PII masking, RBAC and SSO available

Cons

Team plan hard-caps at ten seats before Enterprise
50,000 events included, then $10 per further 50,000 on top of seats
Self-hosted Docker and Kubernetes support is the paid enterprise edition, not the free one
Company country is inferred from the entity name; no address is published

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 Lunary if you need

Small teams debugging agent traces and watching token spend
Keeping prompt versions and A/B tests outside application code
Self-hosting observability when traces cannot leave your network