Overview
The Rosetta Salt application can be used from your browser and/or your mobile device. And, it should behave the same no matter which client/device you use. The Rosetta Salt application is a progressive web app. Among other things, this means that it is a web application which is meant to be used on mobile platforms, in addition to desktop and laptop platforms. Once it has loaded for the first time on your mobile platform, you can add it to your "home screen" (Android and iPhone) and after that it should be indistinguishable from how a Rosetta Salt native mobile app might look and behave.
Native Mobile App?
At present, there is not a Rosetta Salt native mobile app.
There are several reasons for this, but we are open to developing native mobile apps in the future.
The first reason is that there isn't really a driving force behind developing a native mobile app and incurring the overhead involved in developing, certifying, and deploying it. The application does not currently need access to any of the devices or services that are specific to mobile platforms. And there is little benefit to incurring the overhead, especially the overhead related to making it available in the Apple App Store.
The second reason is that the mobile and non-mobile platforms can be updated at the same time. If a native mobile app (or several native apps) are introduced, then there may need to be more coordination and effort related to updating the backend services that support the application clients. The React Native native application framework would be the natural choice to complement the React application framework that we use for the application client now, but even it would introduce more coordination and effort.
Therefore, at present, we'd prefer to extend and improve the progressive web application in the directions you and others would like to see it move. However, if you and others would prefer a native mobile app in the future, we'll certainly consider it.