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fd VS Underlayer

Compare fd VS Underlayer and see what are their differences

fd

A simple, fast and user-friendly alternative to 'find'.

Rating
0 reviews
Pricing
Open source
Alternatives Is it good?
Underlayer

Build courses by API, drop them into your product with one iframe, and get told who finished. No portal, no learner accounts, priced per course view.

Rating
0 reviews
Pricing
Freemium $149 / Monthly
Alternatives Is it good?
Eddyter
Build and integrate a WYSIWYG editor in minutes. Eddyter offers fast setup, developer-friendly APIs, and seamless content editing for modern web apps today. sponsored
Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

Which is more popular?

Based on our record, fd seems to be more popular. It has been mentioned 130 times since March 2021.

social mentions
130 vs 0
Productivity popularity
100% vs 0%
alternatives listed
72 vs 2

Base details

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

fd
Underlayer
Website github.com underlayerhq.com
Pricing
Open source
Freemium $149 / Monthly Official pricing
Company Startup from Germany Startup from the United Arab Emirates · 1 - 9 employees · 2026
Listed in
Terminal Tools Developer Tools API Tools Linux +1
Education E-learning Education / E-Learning

About fd and Underlayer

In their own words, as submitted to SaaSHub.

fd
Underlayer

No description of fd yet.

Underlayer is headless, API-first training for SaaS products. Instead of sending your users to a separate LMS portal, you generate a course, embed it where they already work, and get every completion sent back to your own systems. How it works Create a course. Generate one from a doc or a prompt...

Read more about Underlayer

Features and specs

What each product offers, as listed by its team.

fd 6 features
Underlayer 0 features
  • Speed
    fd is optimized for speed and can outperform traditional tools like find due to its use of parallelism and optimized algorithms.
  • Ease of Use
    fd has a simpler and more user-friendly syntax compared to find, making it easier to learn and use.
  • Colorized Output
    fd provides colorized output by default, making it easier to differentiate between file types and enhancing readability.
  • Smart Case
    fd enables smart case detection by default, meaning searches are case-insensitive unless the pattern includes an uppercase letter.
  • Defaults to Ignoring Hidden Files
    By default, fd ignores hidden files and directories, as well as files specified in .gitignore, helping to narrow down search results to relevant files.
  • Cross-Platform Support
    fd supports multiple platforms including Linux, macOS, and Windows, making it versatile for different development environments.

Possible disadvantages

  • Dependency on Rust
    fd requires the Rust toolchain to build, which may be inconvenient for environments where installing additional dependencies is restricted.
  • Limited to Modern Features
    fd may not support some legacy systems and older versions of operating systems, limiting its applicability in certain scenarios.
  • Not as Feature-Rich
    While fd is easier to use, it doesn't have all the advanced features and fine-grained control options that find offers.
  • Compatibility
    fd’s simplified syntax and modern features may not be directly compatible with scripts or workflows that depend on find, requiring adjustments for integration.

No features have been listed yet.

Analysis

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

fd
Underlayer

Overall verdict

  • Yes, fd (github.com) is generally considered good, particularly for its speed, ease of use, and modern features that enhance productivity over the traditional 'find' command.

Why this product is good

  • fd is a program for users who need a fast and user-friendly alternative to the traditional 'find' command. It provides a simple syntax, speed improvements by parallelizing search processes, ignores hidden files and directories by default, and offers colorized outputs, making it more intuitive and efficient for everyday use.

Recommended for

    fd is recommended for developers, system administrators, and power users who often search through directories and require a fast, efficient tool with a shorter learning curve.

No analysis of Underlayer yet.

Videos

Walkthroughs and reviews on video.

fd 3 videos + Add
Underlayer 1 video + Add

Discmania FD (Fairway Driver) Golf Disc Review

More videos

  • - Honda Civic FD | Review & Tips If you want to own one
  • - Regular Car Reviews: 1993 Mazda RX-7 FD

Underlayer demo

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
fd
Underlayer
100% 100%
Productivity
0% 0%
0% 0%
Education
100% 100%
100% 100%
Note Taking
0% 0%
0% 0%
E-learning
100% 100%

Questions & Answers

As answered by people managing fd and Underlayer.

Who are some of the biggest customers of your product?

Underlayer's answer:

it's pre-launching

What makes your product unique?

Underlayer's answer:

Underlayer is training with no portal. You build a course by API, by MCP, or in the visual builder, and add it to your product with one iframe. Then signed webhooks tell your systems who finished. Learners never create an account or leave your app, and the player uses your theme, so it looks like part of your product. We charge per course view, not per seat, and every price and overage rate is published.

Why should a person choose your product over its competitors?

Underlayer's answer:

Most course tools, like Coassemble, Trainn and LearningStudioAI, assume training happens on their own site: learners sign up, log in and get enrolled, and you pay per seat. Underlayer takes the opposite approach:

No learner accounts. You pass in your own user IDs and we track progress against them. Built for developers. A full REST API covers every resource, and an MCP server lets AI agents create and edit courses. Results in your own tools. Signed webhooks send completions to your CRM, your product or your data warehouse. SCORM 1.2 and 2004 export for customers who still need to load courses into an LMS. Public pricing. Plans start at $149/month for 25,000 course views, with unlimited learners and no sales call required.

How would you describe the primary audience of your product?

Underlayer's answer:

SaaS product, customer success and engineering teams who want onboarding, product education or compliance training inside their own app. It also suits platforms that train other people's users, like partner networks, marketplaces and field-ops tools, where a separate LMS login gets in the way.

What's the story behind your product?

Underlayer's answer:

Every company putting training in front of its users hit the same wall: the LMS wanted to own the learner. That meant a separate portal, a second login and a per-seat bill for people who never opened a course. We built Underlayer as the layer underneath instead. You keep the product and the user relationship. We handle building the course, playing it and tracking progress, and we stay out of the way.

Which are the primary technologies used for building your product?

Underlayer's answer:

Next.js 16 (App Router) with React 19 and TypeScript, Tailwind CSS v4, and Supabase (Postgres with row-level security, Auth and Storage). Claude from Anthropic generates courses with AI. Stripe handles billing and Resend sends email. There is also a remote MCP server with OAuth 2.1 for AI-agent access.

User comments

Share your experience with using fd and Underlayer. For example, how are they different and which one is better?

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Social recommendations and mentions

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

fd 130 mentions
Underlayer 0 mentions
  • I Replaced a 461-Million-Downloads-a-Month Glob Package With One Rust File
    Fast-glob was the Package Killer target, but it was not the only comparison worth making. Developers often reach for fd or ripgrep when they need to locate files from a terminal. They are mature native tools with excellent defaults, so... - Source: dev.to / about 1 month ago
  • I wrote an bash enumerator because I was sick of xargs
    > Find works, but the syntax is arcane. Fd is a lifesaver: https://github.com/sharkdp/fd. - Source: Hacker News / 3 months ago
  • Biff is a command line datetime Swiss army knife
    I know that if you want `fd` (https://github.com/sharkdp/fd) you need to `apt install fd-find` and which installs the binary `fdfind` (!). - Source: Hacker News / 5 months ago

View more

Tracking Underlayer since Sep 2026.

Alternatives to fd and Underlayer

When comparing fd and Underlayer, you can also consider the following products.

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