
Helicone AI
LangSmith
LangChain
Portkey
Braintrust.dev
PromptLayer
liteLLM
Langfuse is an open-source LLM engineering platform that helps teams collaboratively debug, analyze, and iterate on their LLM applications.

CELPIP Simulator
CELPIP Practice
celprep.io
PracticeCELPIP.ca
Gurully
NorthPrep.ca
TargetCLB
AI-powered CELPIP prep with realistic full-length practice tests and instant feedback on speaking, writing, listening, and reading. Hit your target band score faster.

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 | celpify.com |
| Pricing | ||
| Company | Startup from the United States | Startup from Canada · 2026 |
| 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....
CELPIP Prep, Powered by AI Celpify is an AI-powered CELPIP test prep platform built for people who need a real band score, fast — Canadian PR and citizenship applicants, international students, and professionals working toward licensing in nursing, engineering, accounting, and other regulated...
What each product offers, as listed by its team.


Possible disadvantages
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An editorial look at what each product does well and who it suits.


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Overall verdict
Why this product is good
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Walkthroughs and reviews on video.
Langfuse in two minutes
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How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Langfuse and Celpify. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


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 / 12 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 Celpify since Apr 2026.
When comparing Langfuse and Celpify, you can also consider the following products.

Open-source LLM Observability for Developers
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Build and deploy LLM applications with confidence
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Ace Each CELPIP Module with Confidence, Master the individual modules of the CELPIP exam with tailored practice.
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Framework for building applications with LLMs through composability
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