Remove Color. Well ok, you can have one color, but use it extremely sparingly to indicate action. Everything else better be black and white. Let the content of your app bring the color.
Complexion Reduction: A New Trend in Mobile Design
Michael Horton
7K161

I also think this only applies to apps that host user generated content. It works for Instagram or Airbnb or social media apps, but not every app.

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