To use this app, you’ll need Internet Explorer 9 with the latest security updates or later (list of supported browsers), and one of these applications:
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The “Napa” Office 365 Development Tools make it easy to start building apps for Office and SharePoint without leaving your browser or installing software. Just add the “Napa” Office 365 Development Tools app to your SharePoint Online Developer Site, launch it, and you will be ready to create your first app for Office or SharePoint.
When you are ready to leverage the powerful capabilities in Microsoft Visual Studio 2012, the “Napa” Office 365 Development Tools makes it easy to download your project, get the required software and continue developing your app for Office or SharePoint.