I'm setting out to create a mobile app using Ionic.
However I would also like my app to work well and look good on a desktop.
Is there any way to create one app one time that looks good and works well on both platforms (and perhaps more platforms as well)?
Ionic is only intended to be used for mobile devices and is not tested on, developed for, or officially supported on desktop browsers. -http://forum.ionicframework.com/t/why-no-desktop/7908/5
Having said that, the main logic of ionic apps are derived from Angular. By pairing angular with bootstrap or foundation (or your favorite responsive framework), you will get (I'm assuming) your ultimate goal of having a responsive site that looks well both on mobile and desktop, with all of the logical power of ionic.
If you decide to go this route, you can then use Cordova or Phonegap in order to compile your website into a mobile application that will act natively on mobile devices. Ionic actually uses Cordova under the hood so you will notice that syntactically they are very similar.
I am tried to using ionic on my web app. Its working fine. But i have facing some issues likes browser scroll bar scrolling very slowly. You have to trying Ionic Material http://ionicmaterial.com/ or Angular Material https://material.angularjs.org/latest/#/