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Langfuse

langfuse.com

An open-source platform for tracing, evaluating and improving LLM apps and agents, with prompt management; part of ClickHouse since 2026.

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About Langfuse

Teams cannot see why an agent failed or whether a prompt change made it better.

Who it’s for

  • Developers running LLM apps in production
  • Teams evaluating prompts and agents

When to consider it

Consider Langfuse when you want open-source observability and evals that you can self-host.

Tradeoffs & limitations

  • The free cloud plan includes 50,000 units a month with 30 days of data access.
  • The core is MIT licensed; enterprise features use a separate license.

SOTA overview · Documentation-based assessment · Sources & review method

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Comparisons & guides

How AI products price in 2026: free plans, credits and the $20 tierAI products that were renamed, acquired or shut down: what we tracked in 2026Open-source AI tools and their licenses: MIT, Apache 2.0, AGPL and source-available
Sources & review method

Documentation-based assessment · Oct 1, 2026 · Prepared with AI assistance; not a hands-on benchmark.

Checked by SOTA · AI-assisted documentation review. Selection advice is our assessment; verify current requirements for your deployment.

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Import history & original evidence

Langfuse official website

Scope: Product overview · Imported Oct 1, 2026

An open-source platform for tracing, evaluating and improving LLM apps and agents, with prompt management; part of ClickHouse since 2026.

Based on official pages and announcements checked on 2026-10-01. No hands-on test, performance benchmark or popularity ranking is claimed.