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

Typeform
Survey Monkey
Google Forms
Jotform
Wufoo
Paperform
Qualtrics
Use our drag and drop online form builder for surveys, registrations, payment collections, lead generation and more. Our online forms offer robust features and 50+ integrations that allow you to automate workflows, capture leads & more.

Which is more popular?
Based on our record, Langfuse seems to be a lot more popular than Formstack. While we know about 35 links to Langfuse, we've tracked only 1 mention of Formstack.
Website, pricing, platforms and company facts side by side.
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| Website | langfuse.com | formstack.com |
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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....
No description of Formstack yet.
What each product offers, as listed by its team.


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


No analysis of Langfuse yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Langfuse in two minutes
Formstack Review - Build Payment Forms
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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 Formstack. 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...
From simple contact forms to complex surveys and event registrations, Formstack Forms offers a versatile platform to collect feedback and organize data effectively. This SurveyMonkey alternative provides more advanced...
Formstack emerges as a strong alternative to Survey Monkey, particularly for users who prioritize versatile form-building capabilities, robust integration options, and advanced security features. Its emphasis on data...
Formstack is another documentation tool that eliminates all the paperwork and automates the document creation process. It is a simple document creator that lets you produce different kinds of documents, right from...
Recommendations tracked on public social media and blogs since March 2021.


Langfuse is an open-source LLM engineering platform specialized for AI applications. It provides:. - Source: dev.to / 22 days 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 / 28 days ago
We have researched and experimented with several AI evaluation platforms, including Arize Phoenix, Microsoft Foundry, and Langfuse. After evaluating them against our requirements and roadmap, we shortlisted Microsoft Foundry and Langfuse... - Source: dev.to / about 1 month ago
Tired of paying $50 monthly for form mail on your website from https://formstack.com. Source: over 5 years ago
When comparing Langfuse and Formstack, 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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Create and publish online surveys in minutes, and view results graphically and in real time. SurveyMonkey provides free online questionnaire and survey software.
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Framework for building applications with LLMs through composability
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