Mobile app format

When building a mobile app is it always best to be in the mobile page width format or should it be on custom so it is able to be responsive?
I am building a mobile app and was just wondering what would be the best format/page layout to be using and to be working with.

I think it would be smart to do mobile first like you are suggesting then check the responsiveness at bigger screen sizes. This way you’re always sure your content will fit on the smallest target platform.

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I am not going to suggest one way or the other, (now I’ve got a song in my head!), but I would suggest you use the likes of Chrome browsers dev tools to switch between predefined device screen sizes and responsive. It is better for testing that the responsive view on the editor.

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@john3 @DaveA thank you both! I will use both advice! Much appreciated