Cappuccino is an open source framework that makes it easy to build desktop-caliber applications that run in a web browser.


Objective-J code

Lightning Objective-J Language

Objective-J is a powerful object-oriented language which compiles to run in the browser. Because Objective-J is a superset of JavaScript, it's easy to mix and match. Objective-J extends JavaScript with traditional inheritance and Smalltalk/Objective-C style dynamic dispatch.


Fish Stunning Controls

Cappuccino's AppKit ships with a huge number of controls, each polished far beyond what's expected on the web. You can quickly build complex apps without reinventing the wheel every time you need a scrollable, sortable, virtual, auto-saves-column-settings table view.

* Fish widget not actually included.

XcodeCapp Notification

Paint brush Interface Builder

If you have a Mac you can build your Cappuccino user interface in Xcode's Interface Builder, just like you would in Cocoa. Skip the tweak-coordinated-rebuild-test cycle and just place labels and buttons where you need them. The XcodeCapp utility will do the rest.




Latest Version: 0.9.9 (March 31 2016)

Beyond the starter pack, Cappuccino comes with a number of tools to make it easy to create new applications. With or without the starter pack, you can install all of Cappuccino and accompanying tools with the following command:

curl https://raw.githubusercontent.com/cappuccino/cappuccino/v0.9.9/bootstrap.sh >/tmp/cb.sh && bash /tmp/cb.sh

What Next?

Your download includes a README file with a few quick tips on how to get started.

You'll also probably want to check out our tutorials section. The get started one is designed specifically for figuring out what to do the very first time you download Cappuccino.

Getting the Source

If you'd like the full source, you can check it out from our GitHub repository, or clone it with this command:

git clone git://github.com/cappuccino/cappuccino.git

Learn more about contributing.



Cocoa on the web: 280 North, Objective-J, and Cappuccino

...from what I have experienced using 280 Slides, a future with Cappuccino based-apps is a bright one.

Chris Foresman, Ars Technica

Why Objective-J, Cappuccino and SproutCore are completely changing the web app industry

...if you use Cappuccino, those apps will automatically look and behave like ... desktop apps - with zero learning curve on the developer's side. He or she can simply focus on building an kick ass app instead of trying to re-invent basic UI functionality every single time.

Ryan Carson, Carsonified

An interview with 280 North on Objective-J and Cappuccino

I can see the allure of Objective-J / Cappuccino for building desktop-like Web applications. It gives you a very high level abstraction over the browser. No more DOM. No more CSS layouts, which can be the bane of your existence for a complicated and dynamic layout.

Dion Almaer, Ajaxian

From the Blog

Cappuccino News 2016 April 1st

Here’s a quick update on what’s new with Cappuccino in the last month.


Cappuccino 0.9.9 has now been released! This release follows almost exactly a year from 0.9.8 and in that year we have been busy. No matter what your Cappuccino app...


Cappuccino 0.9.9

As announced at CappCon 2016, Cappuccino 0.9.9 has now been released! This release follows almost exactly a year from 0.9.8 and in that year we have been busy. No matter what your Cappuccino app is about, there is something in this release for you...


Virtual Environments for Cappuccino


It’s been a little while, but Cappuccino Tools now have a newcomer: capp_env. This new tool is like virtualenv for Python. It makes it possible to create multiple self-contained Cappuccino environments. This way you can have multiple parallel...