If you want to build your custom Twixl App, you can add a Launch Image. We created a special Photoshop template that explains how to do this.
The Launch Image is what it says: it's the first thing your users see when they launch your app.
You configure the Launch Image of your app in the build setting of your app. It needs to be:
3. How to design?
We use one Launch Image for both Phones and Tablets.
This means that the image gets cropped and this can impact your design. So it's better to take this into account when creating your launch image.