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Langfuse VS Underscore Done

Compare Langfuse VS Underscore Done and see what are their differences

Langfuse

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

Rating
0 reviews
Pricing
Open source
Alternatives Is it good?
Underscore Done

Real-world tasks your agent can't do alone.

Rating
0 reviews
Pricing
Paid $0.01 (Per api call)
Alternatives Is it good?
Mind Diary
MindDiary therapy practice management software: digital intake, lead capture, client check-ins, therapist-reviewed AI notes, telehealth, and revenue follow-up. sponsored

Which is more popular?

Based on our record, Langfuse seems to be a lot more popular than Underscore Done. While we know about 35 links to Langfuse, we've tracked only 1 mention of Underscore Done.

social mentions
35 vs 1
AI popularity
98% vs 2%
alternatives listed
240+ vs 2

Base details

Website, pricing, platforms and company facts side by side.

Langfuse
Underscore Done
Website langfuse.com underscoredone.com
Pricing
Open source
Paid $0.01 (Per api call) Official pricing
Company Startup from the United States Startup from the United States · 2026
Listed in
Help Desk Productivity User Engagement AI +1
APIs Developer APIs AI Agents AI +1

About Langfuse and Underscore Done

In their own words, as submitted to SaaSHub.

Langfuse
Underscore Done

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....

Read more about Langfuse

Underscore Done (_done) is a suite of pay-per-call utility APIs built for AI agents. No API keys, no subscriptions - agents pay per request with USDC via the x402 protocol

Read more about Underscore Done

Features and specs

What each product offers, as listed by its team.

Langfuse 3 features
Underscore Done 0 features
  • User-Friendly Interface
    Langfuse offers a clean and intuitive interface that makes it easy for users to navigate and use the platform efficiently, regardless of their technical skill level.
  • Integration Capabilities
    The platform provides a variety of APIs and integration options, allowing users to seamlessly connect Langfuse with other applications and services they use.
  • Comprehensive Analysis Tools
    Langfuse offers advanced analysis tools that help users to gain insights from their language data, improving decision-making and strategy development.

Possible disadvantages

  • Limited Language Support
    While Langfuse offers a range of language options, it may not support as many languages as some global companies require, potentially limiting its usability for diverse linguistic needs.
  • Pricing Model
    The pricing model of Langfuse might be considered expensive for small businesses or startups with a limited budget, which can make it less accessible to those users.
  • Learning Curve for Advanced Features
    While the basic features are easy to use, some advanced functionalities might have a steep learning curve, requiring more time and effort from users to fully leverage them.

No features have been listed yet.

Videos

Walkthroughs and reviews on video.

Langfuse 1 video + Add
Underscore Done 0 videos + Add

Langfuse in two minutes

No Underscore Done videos yet. You could help us improve this page by suggesting one.

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
Langfuse
Underscore Done
98% 98%
AI
2% 2%
0% 0%
AI Agents
100% 100%
100% 100%
Developer Tools
0% 0%
100% 100%
Productivity
0% 0%

Questions & Answers

As answered by people managing Langfuse and Underscore Done.

What makes your product unique?

Underscore Done's answer:

We provide data and actions that AI cannot achieve.

Also we don't require accounts, registration, api keys. And we charge per usage and never charge monthly subscriptions.

How would you describe the primary audience of your product?

Underscore Done's answer:

Ai Agents that work on behalf of people.

User comments

Share your experience with using Langfuse and Underscore Done. For example, how are they different and which one is better?

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Reviews and articles

External articles and on-site reviews we used to compare the two products.

Langfuse no reviews yet
Underscore Done no reviews yet

We have no reviews of Underscore Done yet. Be the first one to post

Social recommendations and mentions

Recommendations tracked on public social media and blogs since March 2021.

Langfuse 35 mentions
Underscore Done 1 mention
  • Production-Grade Observability: Agent Kernel Integrates Langfuse and OpenLLMetry
    Langfuse is an open-source LLM engineering platform specialized for AI applications. It provides:. - Source: dev.to / about 9 hours ago
  • Top 5 LLM Observability Platforms for Enterprises in 2026
    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 / 6 days ago
  • Set up a .NET application w/th OpenTelemetry, and trace/evaluate in Langfuse
    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 / 15 days ago

View more

  • Why I'm Passionate About x402
    _done is a catalog of small, pay-per-call utility APIs aimed at AI agents: things like DNS and WHOIS lookups, screenshots, OCR, hashing, QR codes, and SEO extraction. Every call costs one cent in USDC over x402. There's no account and no... - Source: dev.to / 13 days ago

Alternatives to Langfuse and Underscore Done

When comparing Langfuse and Underscore Done, you can also consider the following products.

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