Design Goals

A clean and simple UI

As simple as it can be, but no simpler.

True to Apple’s platform conventions

Regardless of if it is on a Mac, iPad, or iPhone, the app should match that platform's conventions.
That means following Apple's HIG and creating as few custom controls as possible.

Accessible to those with different needs

We shouldn't discriminate against those with different needs. We don't consider this a burden. By sticking to stock controls as much as possible and putting in a small amount of work, it is very achievable.