Screenshot taken from IonicFramework.com
(That's not the Yahoo! weather app—just inspired by the Yahoo! weather app.)
It runs nicely on iOS, Android, and as a web application.
Here is a tutorial illustrating how to get started with Ionic.
First, install the necessary node modules:
sudo npm install -g cordova ionic
Next, initialize your project, either from a template or a new blank project. If you want to start a blank project, use this command:
ionic start myApp blank
To start a project from a template, use one of these two commands (depending on which template you want to use):
ionic start myApp tabs
ionic start myApp sidemenu
Change to your app directory:
If you're on a mac, I am told you can build an ios version with these commands. However, I am not on a mac, so I didn't test this. But I got this from the ionic website so it probably works.
ionic platform add ios
ionic build ios
ionic emulate ios
If you are not on a mac, you can start your app in your browser with this command (run from inside the www/ directory):
python -m SimpleHTTPServer
Then if you go to http://localhost:8000 you should see your new ionic app! That's all there is to it.
Here is a good tutorial video from Ionic:
Video credit: Ionic on Youtube