Opa Alternatives & Reviews


Opa is an open source programming language for building web applications. It is free to use and comes with a compiler and JavaScript library.
Rating (4.00)
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21 Best Alternatives to Opa

AngularJS icon


AngularJS is a software which allows the user to extend their HTML vocabulary. This extension creates dynamic views in web applications that previously had not been possible.
Ruby on Rails icon

Ruby on Rails

Ruby on Rails is a cross-platform web development framework that allows developers to create databases, webpages, and provide various web services. The framework was introduced in 2005 and continues to receive updates today.
Haxe icon


Haxe is an open source toolkit based on a modern, high level, strictly typed programming language.
ASP.NET icon


Build web apps and services that run on Windows, Linux, and macOS using using C#, HTML, CSS, and JavaScript. Get started for free on Windows, Linux, or macOS.
ember.js icon


Write dramatically less code with Ember's Handlebars integrated templates that update automatically when the underlying data changes. Don't waste time making trivial choices.
Derby icon


What is Apache Derby? Apache Derby, an Apache DB subproject, is an open source relational database implemented entirely in Java and available under the Apache License, Version 2.
FeathersJS icon


FeathersJS is an open source platform for users to create REST API's and real-time applications. FeathersJS provides tools and patterns to create these apps in little to no time to increase maximum efficiency.
Nim (programming language) icon

Nim (programming language)

Nim is a systems and applications programming language. Statically typed and compiled, it provides unparalleled performance in an elegant package.
Ceylon icon


August 21, 2017: Ceylon is moving to the Eclipse Foundation!
Kotlin icon


Kotlin · Learn Community Try Online. Statically typed programming language for modern multiplatform applications. 100% interoperable with Java™ and Android™.
Sails.js icon


views/homepage. ejs. Purpose. #. This is the actual template that is rendered by default when a user visits the base URL of your lifted app.
Kendo UI icon

Kendo UI

Kendo UI is a component library for JavaScript that allows developers to create slick and modern looking web apps in a fraction of the time.
Backbone.js icon


Backbone. js markets itself as coding software designed to give web applications structure. It accomplishes this by providing intricate models with key-value bindings and custom events built into its infrastructure.
Koa icon


Koa requires node v7. 6. 0 or higher for ES2015 and async function support.
Catalyst icon


Catalyst is the most popular agile Perl MVC web framework that encourages rapid development and clean design without getting in your way.
Yesod icon


Yesod is a development tool used to create highly efficient websites and web applications from the ground up. Yesod includes almost everything you need to build a website, from templates to routing and execution.
Apache Flex icon

Apache Flex

Apache Flex is an open-source tool that allows users to build their own apps. Applications can be designed and created for a variety of mobile and traditional platforms.
mithril icon


Mithril is used by companies like Vimeo and Nike, and open source platforms like Lichess. If you are an experienced developer and want to know how Mithril compares to other frameworks, see the framework comparison page.
Express.js icon


Express. js is a web framework for Node. js that was inspired by Sinatra. It was created and released under the MIT license by T. J.
Sinatra icon


A Brief Description of Sinatra Software Sinatra is a software whose development and design is attributed to Blake Mizerany. The software is freely accessible since it is an open source web application that uses domain specific language written in Ruby.

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Pros of Opa

Only need one language to develop web applications
Eliminates need to use separate languages for application server, UI, and database
Opa libraries are compatible with JavaScript
Can build cloud apps with Opa
Free to use

Cons of Opa

Developers must learn the entire language since it is an all-in-one solution
Some functionality is sacrificed since other languages cannot be integrated
Opa must be implemented from the top-down
Must learn OCaml to contribute to the open source project
Documentation is evolving

Opa Icon Features of Opa

Open-source web development language
Compiles code accordingly, such as JavaScript
Bundles web server and database management system
Available in 64-bit Linux and Mac OS X
Typechecker feature verifies code
HTML5 support

Opa Reviews

by grex about Opa on March 2, 2018:
Opa is a new programming language that essentially is all-encompassing when it comes to web development. It aims to replace the use of several different languages by enabling developers to write single-tier applications while letting Opa’s engine create the client, server, and database code from within. It also makes deploying applications much easier since developers only have to copy one file to the location of the executable.

Security is enhanced because of the monotheistic nature of the program. Internally, Opa thinks your application’s files, directories, etc. are in an external file system, but they aren’t. All of this is compiled from within the application. If the application’s directory is accessed, the folders and files won’t be seen, so they cannot be manipulated. Opa also has a built-in security auditor that functions and provides feedback as your application is built.

Opa’s engine is written in OCaml and, for developers, that makes it necessary to learn an entirely new language develop applications and also contribute updates and improvements to Opa’s source code. Its IDE also could be more robust, so “debug-by-printf” is the preferred debugging method. Opa’s documentation is good, but still is evolving.

Opa is still in a growth phase. Developers are slowly learning how to work with it despite their dependence on other languages and development technologies. It can be a great tool for rapid prototyping and deployment and production of scientific and educational tools in the meantime.
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Review Summary
Opa has currently been reviewed with 1 opinions.

In total, that's a combined rating of 4.00 out of 5 stars.

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