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Langfuse is an open-source LLM engineering platform that helps teams collaboratively debug, analyze, and iterate on their LLM applications.

Celpify
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Train smarter.

Which is more popular?
Based on our record, Langfuse seems to be more popular. It has been mentioned 36 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | langfuse.com | celprep.io |
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| Company | Startup from the United States | — |
| Listed in |
In their own words, as submitted to SaaSHub.


Langfuse is an open-source LLM engineering platform designed to empower developers by providing insights into user interactions with their LLM applications. We offer tools that help developers understand usage patterns, diagnose issues, and improve application performance based on real user data....
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Ten free AI prompt tools in 2026 across four categories: prompt generators (SurePrompts, Anthropic Console, OpenAI Playground), libraries (AIPRM, PromptHero, FlowGPT, Awesome ChatGPT Prompts), open-source workflow...
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Recommendations tracked on public social media and blogs since March 2021.


Your agent gave a wrong answer, and every span in the trace is green. Both TraceRoot and Langfuse will show you that trace. This post compares what each one does next, from tracing and detection to a root cause and a fix. - Source: dev.to / 13 days ago
Langfuse is an open-source LLM engineering platform specialized for AI applications. It provides:. - Source: dev.to / about 1 month ago
Langfuse is an open-source observability and analytics platform for LLM applications. Its open-source nature is a significant draw for companies that prefer to self-host or want to avoid vendor lock-in. - Source: dev.to / about 2 months ago
Tracking celprep.io since Mar 2026.
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