
Google App Engine
Salesforce Platform
Google Cloud Functions
Heroku
AWS Lambda
Azure Web Apps
CapRover
Docker powered mini-Heroku in around 100 lines of Bash

Coassemble
Trainn.co
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.

Which is more popular?
Based on our record, Dokku seems to be more popular. It has been mentioned 30 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | dokku.com | underlayerhq.com |
| Pricing | ||
| Company | — | Startup from the United Arab Emirates · 1 - 9 employees · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Dokku 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...
What each product offers, as listed by its team.


Possible disadvantages
No features have been listed yet.
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
No analysis of Underlayer yet.
Walkthroughs and reviews on video.
00028 Creating Your Own PaaS with Dokku
More videos
Underlayer demo
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Dokku and Underlayer.
Underlayer's answer:
it's pre-launching
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.
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.
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.
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.
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.
Share your experience with using Dokku and Underlayer. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


Dokku is an open-source Heroku clone you can run on any VPS. It supports Heroku buildpacks and gives you complete control. Requires server administration skills.
Dokku is a great alternative if you’re working with a stringent budget. It’s a miniaturized self-hosted platform as a service. You can deploy applications to it using Git. Because it’s a Heroku derivative, it’s...
CapRover is in many ways similar to Dokku. It uses Docker for deployment just like Dokku but CapRover does not support buildpack deployments as it uses Dockerfiles only. This is not necessarily a bad thing since...
We have no reviews of Underlayer yet. Be the first one to post
Recommendations tracked on public social media and blogs since March 2021.


This post compares the four self-hosted and "self-hosted-style" PaaS options we see startups evaluating most often: Coolify, Dokku, CapRover, and Ownkube. We'll cover what each one is, who it fits, where the ceiling is, and the honest... - Source: dev.to / about 1 month ago
Dokku is the smallest PaaS implementation you've ever seen. It's a self-hosted Heroku alternative that runs on a single server. Push code with git push — Dokku builds, deploys, and manages your apps. - Source: dev.to / 7 months ago
I think that https://dokku.com/ is actually the closest to what you are building. - Source: Hacker News / 8 months ago
Tracking Underlayer since Sep 2026.
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A serverless platform for building event-based microservices.
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Agile deployment platform for Ruby, Node.js, Clojure, Java, Python, and Scala. Setup takes only minutes and deploys are instant through git. Leave tedious server maintenance to Heroku and focus on your code.
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