Mobile apps are a sequestered experience. It is easier to maintain a users attention inside your app. Many apps now, also include access to their settings and p

Mobile apps are a sequestered experience. It is easier to maintain a users attention inside your app. Many apps now, also include access to their settings and preferences inside their app to prevent users from 'thinking outside their app'. web apps leave you with the same feeling you get when paying attention to something and have HN and twitter on the monitor. there is also the matter of your app's identity. Unless you are using sencha or a similar tool, i think it is easier to convey the purpose of your a software much easier if it is an app.