Hi, you can take a look at our packages:
Responsive layout grid
for responsive modals:
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There was some discussion about flutter_screenutil in reddit recently: https://www.reddit.com/r/FlutterDev/comments/1guzxwf/comment/lxxxtw8/ with my comment there saying I hate it 
If client comes in with a fixed Figma and wants to see the app like that in every device, you can use flutter_screenutil but it’s really awkward to have to remember the .w everywhere. Instead you may find my approach of scaling the whole screen and working with Figma’s units in it with const widgets: Scales the whole screen in the scaffold so you work with Figma's units and enjoy const widgets at the same time · GitHub
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I still have no idea why flutter_screenutil exists to be honest.
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Wow, that looks amazing. If I ever need this functionality I hope I remember your package
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U can use flutter_screenutil package