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Quill VS Underlayer

Compare Quill VS Underlayer and see what are their differences

Quill

Powerful, API-driven rich text editor

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, Quill seems to be more popular. It has been mentioned 37 times since March 2021.

social mentions
37 vs 0
Text Editors popularity
100% vs 0%
alternatives listed
163 vs 2

Base details

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

Quill
Underlayer
Website quilljs.com underlayerhq.com
Pricing
Open source
Freemium $149 / Monthly Official pricing
Company — Startup from the United Arab Emirates · 1 - 9 employees · 2026
Listed in
Text Editors Rich Text Editor WYSIWYG Editor IDEs And Text Editors +1
Education E-learning Education / E-Learning

About Quill and Underlayer

In their own words, as submitted to SaaSHub.

Quill
Underlayer

No description of Quill 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.

Quill 6 features
Underlayer 0 features
  • User-friendly Interface
    Quill offers a highly intuitive interface that’s easy for users to navigate, making it accessible for both technical and non-technical users.
  • Rich Text Editing
    Quill supports rich text editing, allowing formatting, embedding media, and even custom operations through an extensive API.
  • Customizability
    Developers can customize the editor through themes, modules, and configurations, enabling a wide range of tailored implementations.
  • Open Source
    Quill is open source, allowing developers to contribute to its development, inspect the code, and ensure it aligns with their security standards.
  • Modular Architecture
    Its modular architecture lets developers include only the features they need, optimizing performance and user experience.
  • Active Community and Support
    Quill has an active community, providing extensive documentation, examples, and community support which makes it easier to troubleshoot issues and integrate the editor.

Possible disadvantages

  • Complex Customization
    While Quill is customizable, achieving advanced or very specific customizations can sometimes be complex and time-consuming, requiring in-depth knowledge of its API.
  • Performance Issues
    In some cases, especially with large documents or a high number of embedded elements, users may experience performance lags or slower response times.
  • Limited Built-in Features
    Out of the box, Quill provides a limited set of features compared to some other rich text editors. Additional features often require custom modules or extensions.
  • Lack of Some Advanced Features
    Certain advanced editing features like track changes and version history are not natively supported and need to be implemented separately.
  • Browser Compatibility
    Although Quill supports modern browsers, there may be some inconsistencies or issues in rendering across different browsers and devices, necessitating additional testing and adjustments.
  • Learning Curve for Developers
    New developers may face a steep learning curve when trying to understand and utilize Quill’s API and functionality fully.

No features have been listed yet.

Analysis

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

Quill
Underlayer

Overall verdict

  • Overall, Quill is a highly recommended rich text editor for web applications due to its flexibility, ease of use, and active development community.

Why this product is good

  • Quill is considered a good choice for a rich text editor because it is lightweight, highly customizable, and easy to integrate. It provides a modern and clean user interface, supports a wide range of features such as themes and modules, and offers excellent performance. Quill's community and comprehensive documentation also make it accessible for developers of all skill levels.

Recommended for

  • Developers looking for a lightweight and customizable rich text editor.
  • Projects requiring a straightforward integration process.
  • Applications needing extendable functionality through modules and themes.
  • Environments that prioritize performance and a modern UI.

No analysis of Underlayer yet.

Videos

Walkthroughs and reviews on video.

Quill 3 videos + Add
Underlayer 1 video + Add

Fransesco Rubinato Quill Pen Review

More videos

  • - Harry Potter Quill Vs Writing Quill Review
  • - STORYBOOK COSMETICS QUILL & INK LINER REVIEW/DEMO/ALL DAY WEAR TEST | storiesinthedust

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
Quill
Underlayer
100% 100%
Text Editors
0% 0%
0% 0%
Education
100% 100%
100% 100%
Rich Text Editor
0% 0%
0% 0%
E-learning
100% 100%

Questions & Answers

As answered by people managing Quill 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 Quill and Underlayer. 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.

Quill no reviews yet
Underlayer no reviews yet

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

Social recommendations and mentions

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

Quill 37 mentions
Underlayer 0 mentions
  • Build a Google Docs-Style Editor with NextJS and Quill
    Quill - A powerful, rich-text editor for creating and formatting documents. - Source: dev.to / 11 months ago
  • Tool of the week: Free WYSIWYG Editor with QuillJS
    I’ve put together a simple but powerful online WYSIWYG editor powered by QuillJS. It’s designed for developers, bloggers, and content managers who want to quickly create and format HTML without writing raw code. - Source: dev.to / about 1 year ago
  • Few things to know
    Few alternatives in the category of text editors, Tiptap, Editorjs, Lexical and Quill. - Source: dev.to / about 1 year ago

View more

Tracking Underlayer since Sep 2026.

Alternatives to Quill and Underlayer

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

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