https://techcrunch.com/2019/11/20/email-app-spark-receives-update-with-new-design/

Spark, the popular email app from Readdle, has been redesigned on iOS and Android. The interface has always been a bit busy in the mobile app. That’s why the updated app now features a cleaner design and a handful of new features.

On the design front, Spark now uses simple headers to separate smart sections, such as newsletters, notifications and personal emails. It looks better than the rounded boxes with a colorful background.