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ASP.NET
ember.js
Backbone.js
AngularJS
ExpressJS
Derby.js
Opa is an open source, simple and unified platform for writing web applications.

Which is more popular?
Based on our record, replit seems to be a lot more popular than Opa. While we know about 652 links to replit, we've tracked only 6 mentions of Opa.
Website, pricing, platforms and company facts side by side.
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| Website | opalang.org | replit.com |
| Pricing | — | |
| Company | — | Startup from the United States |
| Listed in |
What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
Walkthroughs and reviews on video.
My food review at Opa of Greece!
More videos
KaBooM! by Swag Bags
More videos
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Opa and replit. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


We have no reviews of Opa yet. Be the first one to post
The best Base44 alternatives in 2026 are Lovable (best design), Bolt.new (most generous free tokens), Replit (best if you can code), Emergent (agent-driven full-stack builds), Bubble (mature visual no-code), Softr...
Replit’s environment also includes AI-powered tools to help with code suggestions and bug fixes, making it useful for beginners and advanced programmers alike. With Replit, you can start coding instantly without...
Replit’s Ghostwriter is used in browser-based coding environments where simplicity and instant collaboration matter most. It’s a natural fit for education, prototyping, or remote work where installation isn’t...
Recommendations tracked on public social media and blogs since March 2021.


Definitely Opa: http://opalang.org/ In 2011, before TypeScript, Next.js or even React, they had seamless server-client code, in a strongly typed functional language with support for features like JSX-like inline HTML, async/await, string... - Source: Hacker News / about 1 year ago
Opa language 2012, it was a typed nextjs before its time. http://opalang.org/ I think the market was still skeptical about nodejs on the server at the time but other than that I don’t really know why it didn’t take off. - Source: Hacker News / about 1 year ago
A tool to solve optimization problems using quantum computers. Just released the first open-source version https://github.com/pasqal-io/maximum-independent-set/. We'll see if I have the energy to work on that. - Source: Hacker News / over 1 year ago
This is one of the strangest side effects of AI-assisted development becoming mainstream. Tools such as Lovable, v0, Bolt, Base44, Google AI Studio, Replit, and Claude can take a plain-language description and turn it into a working... - Source: dev.to / 2 months ago
Replit is closer to an AI development environment than a traditional frontend generator. - Source: dev.to / 3 months ago
• Memory leak? Folder hits 5% → SOLIDIFIES → delete clean Code: https://replit.com/@clydetosspon/tripleos [after you make Replit] Neuromorphic chip makers: this matches your spike physics perfectly (0W idle) Full story in comments. AMA! - Source: Hacker News / 8 months ago
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