Beyond screen size, you should also spend time considering the unique strengths and weaknesses of different form factors. It isn’t always ideal for your multiplatform app to offer identical functionality everywhere. Consider whether it makes sense to focus on specific capabilities, or even remove certain features, on some device categories.

For example, mobile devices are portable and have cameras, but they aren’t well suited for detailed creative work. With this in mind, you might focus more on capturing content and tagging it with location data for a mobile UI, but focus on organizing or manipulating that content for a tablet or desktop UI.

Another example is leveraging the web’s extremely low barrier for sharing. If you’re deploying a web app, decide which deep links to support, and design your navigation routes with those in mind.

The key takeaway here is to think about what each platform does best and see if there are unique capabilities you can leverage.