Proportional design systems with Proportio.app
Briefly

Creating foundational systems
You start by defining your type scale, which will be used for much of the rest of your system.A base font size is used, along with a scale factor such as minor third (1:1.125).Every other font size is based on this ratio.Icons are automatically sized based on the type scale, since typography and icon pairing is a common and important element in design systems.
Read at Medium
[
add
]
[
|
|
]