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Langfuse

Langfuse · Evals & observability
Open-source LLM observability, evals and prompt management.

Langfuse is the most popular open-source tracing and evaluation platform, self-hostable with a generous cloud tier.

3.0(1)Open source · Cloudused by 112+ StackOpen Langfuse ↗

What worked, what broke · 1 review

3.0
out of 5
@sammyharrison58
Sammy HarrisonOct 2026 · 3 months in
Senior System Engineer at Harris Apex · $0–$100K ARR
Worked: Strong open-source tracing, prompt management, and evals. Great self-host option and broad integrations.
Broke: Self-hosting has operational overhead. UI is functional but not the most polished.
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Who uses Langfuse · 106

Members with Langfuse in their stack. Ask one for a reference call before you buy; the ask lands in their AI Lounge inbox in your words.
@preetham
Preetham Reddy$10M–$25M ARR
Founder & CEO · Tech Fabric LLC · Gilbert
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@matthewroche
Matt Roche$10M–$25M ARR
Founder and CEO · Extole · San Francisco
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@jan.varljen
Jan Varljen$10M–$25M ARR
Founder & CTO · Productive · Zagreb
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@sergous
Sergous Peace$3M–$10M ARR
Founder and CEO · ANUKA · Miami
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@kevinyunai
Kevin Yunai$3M–$10M ARR
Founder · RWA Inc · Copenhagen
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@bala
Balaji Varadharajan$3M–$10M ARR
Founder · Tequity.tech · San Francisco
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@justgoscha
Goscha Graf$3M–$10M ARR
Head of AI · TAWO GmbH · Berlin
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@felipetjmg1-bit
Felipe Marcos de Abreu Aquino$1M–$3M ARR
CEO fundador · Impulso Digital · Brasília
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@christiangomez
Christian Gomez$1M–$3M ARR
CEO & Founder · Lety.ai · Miami
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@vishwanathakuthota
Vishwa Akuthota$1M–$3M ARR
Founder & CEO · Dr.Pinnacle · Hyderabad
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@bogdanbrkic
Bogdan Brkic$100K–$1M ARR
Co-Founder & CEO · Next Halo · Belgrade
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@jonatansalas
Jonatan E. Salas$100K–$1M ARR
Co-Founder & CEO · BlackBoxVision · Costa Chica
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@manuel-antunes
Manuel Antunes$100K–$1M ARR
Technical Lead · Lisbom · Maceió
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@albertochong2
Alberto Chong$100K–$1M ARR
Founder · chongtechnologies · Lisbon
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LF @loan
Loan From Fluum$100K–$1M ARR
Founder & CTO · Fluum · Paris
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@promptpartner
Lukas Hertig$100K–$1M ARR
Co-Founder · PromptPartner.AI · Bern
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@noyanidin
Noyan İdi̇n$100K–$1M ARR
AI Founder · Decktopus · Lisbon
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@kyle.l.j.johnson
Kyle Johnson$100K–$1M ARR
Founder · Kyle Johnson Digital Marketing · St Louis
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@esamake74
Esa Mäkeläinen$100K–$1M ARR
Founder and CEO · Valuatum Oy · Helsinki
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@harish-rohokale
Harish Rohokale$100K–$1M ARR
Founder and CEO · Apptware · San Francisco
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+86 more.

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53:32Evals for High-Stakes AI Agents — Doneyli De Jesus & Annabell Schäfer, Langfuse
Evals & observability