[severine]

I use Materialistic (on Android), it's really great, and lets you configure fonts, text sizes and colors.

https://github.com/hidroh/materialistic [project repository]

https://play.google.com/store/apps/details?id=io.github.hidr... [Play Store download]

https://news.ycombinator.com/item?id=12464051 [previous discussion]

(edit: formatting)