Software Alternatives & Startups
Register | Login

Api2Pdf VS Underlayer

Compare Api2Pdf VS Underlayer and see what are their differences

Api2Pdf

PDF Generation API, powered by AWS Lambda. HTML to PDF | URL to PDF | Office Doc to PDF | Merge PDFs . Supports wkhtmltopdf, Headless Chrome, and LibreOffice. No rate limits and no file size limits.

Rating
0 reviews
Pricing
Open source
Promote on VibeVoted
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
Promote on VibeVoted
Alternatives Is it good?
FlexiQuiz
FlexiQuiz is a powerful online test generator that enables you to create engaging online quizzes, tests, or exams in minutes. Choose from 100's of features to create a customized quiz that meets your objectives for business, education, or fun. 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, Api2Pdf seems to be more popular. It has been mentioned 4 times since March 2021.

social mentions
4 vs 0
HTML To PDF popularity
100% vs 0%
alternatives listed
80 vs 2

Base details

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

Api2Pdf
Underlayer
Website api2pdf.com underlayerhq.com
Pricing
Open source Official pricing
Freemium $149 / Monthly Official pricing
Company — Startup from the United Arab Emirates · 1 - 9 employees · 2026
Listed in
HTML To PDF PDF Conversion API PDF Reports PDF Tools +1
Education E-learning Education / E-Learning

About Api2Pdf and Underlayer

In their own words, as submitted to SaaSHub.

Api2Pdf
Underlayer

Api2Pdf.com is an easy-to-use REST API that gets you converting HTML to PDF in minutes. You don't need to worry about installing a PDF rendering engine on your local developer environment and wrangle with it when you deploy your web app to production. Api2Pdf is a wrapper for WKHTMLTOPDF,...

Read more about Api2Pdf

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.

Api2Pdf 5 features
Underlayer 0 features
  • Ease of Use
    Api2Pdf provides a straightforward API that allows developers to easily integrate PDF creation capabilities into their applications without extensive setup or configuration.
  • Multiple Formats
    The service supports converting a variety of formats to PDF including HTML, URLs, and Word documents, offering flexibility for different needs.
  • No File Storage
    Api2Pdf does not store files on their servers, which enhances privacy and compliance with data protection regulations.
  • High Quality Rendering
    Leveraging the wkhtmltopdf and Headless Chrome engines, Api2Pdf provides high-quality rendering of PDFs, which is vital for professional documentation.
  • Scalable Solution
    Api2Pdf can handle a large number of PDF conversions, making it suitable for businesses that require scaling.

Possible disadvantages

  • Cost
    The service can become expensive as usage increases, especially for businesses with high-volume needs.
  • Limited Customization
    Customization options may be limited when compared to other solutions that provide extensive control over the PDF output.
  • Dependency on Third-party
    Relying on an external API service introduces dependency, which can be a risk if the service experiences downtime or changes its terms.
  • Latency
    There can be latency issues due to network conditions or the processing time for large or complex files, affecting real-time applications.
  • Limited Offline Capability
    Since it's a web-based service, users need an internet connection to use it, which might not be suitable for offline applications.

No features have been listed yet.

Videos

Walkthroughs and reviews on video.

Api2Pdf 1 video + Add
Underlayer 1 video + Add

Generate PDFs from .NET with Api2Pdf.com

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
Api2Pdf
Underlayer
100% 100%
HTML To PDF
0% 0%
0% 0%
Education
100% 100%
100% 100%
PDF Conversion API
0% 0%
0% 0%
E-learning
100% 100%

Questions & Answers

As answered by people managing Api2Pdf 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 Api2Pdf and Underlayer. For example, how are they different and which one is better?

Log in or Post with

Social recommendations and mentions

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

Api2Pdf 4 mentions
Underlayer 0 mentions
  • Anyone have experience making their development into a business?
    My colleague and I built api2pdf.com and launched in 2018. It was a massive amount of upfront work requiring sleepless nights and weekends for months on end because launching a SaaS involves way more than just the software component. Source: almost 4 years ago
  • Convert Next.js HTML to PDF and send as email attachment
    It might be easiest to use something like api2pdf.com to convert the HTML to PDF using a simple REST API call instead of trying to wrangle wkhtmltopdf or headless chrome inside serverless functions on Netlify or Google Cloud. That can... Source: over 4 years ago
  • Is Web Development a Viable Option for Making Passive Income?
    I built api2pdf.com - there was a massive upfront effort to build the product, infrastructure, marketing, everything you need to create a real business and a reliable, high quality service. Source: over 5 years ago

View more

Tracking Underlayer since Sep 2026.

Alternatives to Api2Pdf and Underlayer

When comparing Api2Pdf and Underlayer, you can also consider the following products.

  • PDFShift

    Convert any HTML documents to high-fidelity PDF using a single POST request

    Compare PDFShift to Api2Pdf or Underlayer:

    PDFShift vs Api2Pdf PDFShift vs Underlayer
  • Coassemble

    Coassemble is an all-in-one, online training tool that connects people with the information they need – anytime, anyplace.

    Compare Coassemble to Api2Pdf or Underlayer:

    Coassemble vs Api2Pdf Coassemble vs Underlayer
  • DocRaptor

    As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more

    Compare DocRaptor to Api2Pdf or Underlayer:

    DocRaptor vs Api2Pdf DocRaptor vs Underlayer
  • Trainn.co

    Trainn is a Customer Education platform for SaaS companies of all sizes to onboard and train customers, at scale, using product training & how-to videos, feature walkthroughs, and a dedicated customer training Academy.

    Compare Trainn.co to Api2Pdf or Underlayer:

    Trainn.co vs Api2Pdf Trainn.co vs Underlayer
  • PDFCrowd

    Pdfcrowd is a Web/HTML to PDF online service. Convert HTML to PDF online in the browser or in your PHP, Python, Ruby, .NET, Java apps via the REST API.

    Compare PDFCrowd to Api2Pdf or Underlayer:

    PDFCrowd vs Api2Pdf PDFCrowd vs Underlayer
  • pdflayer

    Free, powerful HTML to PDF API supporting both URL and raw HTML conversion. Unlimited document size, lightning-fast and compatible PHP, Python, Ruby, etc.

    Compare pdflayer to Api2Pdf or Underlayer:

    pdflayer vs Api2Pdf pdflayer vs Underlayer
Loading...