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An advanced purely-functional programming language

Ruby on Rails
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, Haskell should be more popular than Opa. It has been mentioned 21 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | haskell.org | opalang.org |
| Pricing | — | |
| Listed in |
In their own words, as submitted to SaaSHub.


We recommend LibHunt Haskell for discovery and comparisons of trending Haskell projects.
No description of Opa yet.
What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
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 Opa yet.
Walkthroughs and reviews on video.
Functional Programming & Haskell - Computerphile
More videos
My food review at Opa of Greece!
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How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Haskell and Opa. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


Haskell - a general-purpose functional language with many unique properties (purely functional, lazy, expressive types, STM, etc). You mentioned you dabbled in Haskell, why not try it again? (I've written about 7 things I learned from... Source: over 3 years ago
Where you go is entirely up to you. According to haskell.org, Haskell jobs are a-plenty. sigh. Source: over 3 years ago
Should they be part of haskell.org or something else? Source: almost 4 years ago
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
When comparing Haskell and Opa, you can also consider the following products.


Ruby on Rails is an open source full-stack web application framework for the Ruby programming...
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Lightweight, interpreted, object-oriented language with first-class functions
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ASP.NET is a free web framework for building great Web sites and Web applications using HTML, CSS and JavaScript.
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Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
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