Thinks that are wrong and bad UI design in my opinion:
the green and blue don’t work at all together. Generally the coloring is quiet extravagant everywhere, especially with the message “this app has been built for an older version […]”
the spacings and margins aren’t coherent everywhere. Like in the app description where the margin to the bottom is okey but to the sides it’s much smaller and almost non-existent.
the grid cells don’t really stand out enough. White on White with such little shadown and spacing inbetween doesn’t work.
the animations are janky and unpolished.
no support for Material UI 3
buttons have too little padding inside around the icon. Buttons are generally a little too small
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Reviews are no privacy concern. You write this here and you’re not concerned for your privacy either.
Their UI is utter trash.
You clearly haven’t used other app stores recently. Else you knew what the level of expectation is these days.
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Thinks that are wrong and bad UI design in my opinion:
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green and blue are fine