
CodeSandbox
replit
CodePen
Glitch
JSFiddle
GitHub Codespaces
vscode.dev
Online VS Code Editor for Angular and React

replit
GitHub Codespaces
Lovable
bolt.new
CodeTasty
Dirigible
Episolo
Your stack in the cloud, with VS Code in the browser and a live HTTPS address in about a minute. Includes a free AI app builder that turns a description into a running app with a real database, and a ready coding lab for every student.

Which is more popular?
Based on our record, StackBlitz seems to be more popular. It has been mentioned 112 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | stackblitz.com | portal.uppcoder.com |
| Pricing | ||
| Platforms | — | |
| Company | — | Startup from Croatia · 2025 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of StackBlitz yet.
Uppcoder runs your stack in the cloud. Pick a framework or a ready-made app, and in about a minute you have a running app at its own HTTPS address, with its database, an editor and a terminal in the browser. Deploy from Git, connect your own domain, and open the database in the built-in admin....
What each product offers, as listed by its team.


Possible disadvantages
Walkthroughs and reviews on video.
StackBlitz - Online Code Editor For Angular and React - Introduction
More videos
Describe an app and the AI builder builds it, with its own database, running | Uppcoder
More videos
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing StackBlitz and Uppcoder.
Uppcoder's answer:
Developers who want their stack running without setting up servers; teachers and schools who need a ready coding lab for every student and autograded assignments, often as a GitHub Classroom replacement; and organisers of hackathons and team projects.
Uppcoder's answer:
Uppcoder is made by Websson d.o.o., a small software company in Pula, Croatia. We built it because setting up a working development environment and putting an app online still takes too long, for professional developers and even more for students. It grew from hosting developer stacks into an AI app builder, coding labs for education and hackathon workspaces, all on the same platform.
Uppcoder's answer:
It covers the whole path from idea to a running app in one place: describe an app to the AI builder, or pick a framework or a ready-made app, and it runs at its own HTTPS address with its database, an editor and a terminal in the browser. The same platform runs coding labs for classes, with assignments marked by tests and LTI 1.3 for Moodle, Canvas and Blackboard, and hackathon workspaces for teams and judges.
Uppcoder's answer:
Most tools do one part: an online editor, an AI app generator, a host, or a classroom tool. Uppcoder does all of them on one account, with real stacks rather than a sandboxed toy: your framework, a real database, deploy from Git, your own domain. There is a free plan, the AI builder can be tried without an account, and hosting can be kept to the region you choose, such as Europe or the United States.
Uppcoder's answer:
Python (FastAPI) and PostgreSQL on the backend, Vue on the frontend, Keycloak for sign-in, Docker and Traefik for running and routing every app, Celery and Redis for background work, and LiteLLM in front of the AI models.
Share your experience with using StackBlitz and Uppcoder. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


All applications created on StackBlitz also get deployed automatically on their servers! So, this Angular toy app I just created is hosted automatically on https://angular-yvyi2j.stackblitz.io/. Most likely, the URL...
I've started using this as my main IDE for new projects when I'm trying things out. If it keeps getting better at the rate it has been, it'll be even better than coding locally.
StackBlitz claims to allow you to code the future in your browser. And after trying it, I’m confident you’ll agree that this web application is extremely useful for coders.
We have no reviews of Uppcoder yet. Be the first one to post
Recommendations tracked on public social media and blogs since March 2021.


Managing reactive state and dependent computations in JavaScript can get complex, especially when combining asynchronous and synchronous data. RS-X is a library that allows you to bind expressions to plain objects and makes the parts of... - Source: Hacker News / 9 months ago
I like htmx, LiveView, React and Solid. They are great at different points, so I try to combine them in Solv (Stateless Offline-capable LiveView) and write a prototype to show the benefits. Solv's main idea is that stateless servers keep... - Source: Hacker News / 12 months ago
I like htmx, LiveView, React and Solid. They are great at different points, and this is a prototype trying to combine them. Solv's main idea is that stateless servers keep client's state in a volatile cache. It enables server components... - Source: Hacker News / 12 months ago
Tracking Uppcoder since Oct 2026.
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