Slate is a neo-grotesque sans-serif typeface designed by Rod McDonald at Monotype Corporation in 2006, which was designed for high levels of legibility.

McDonald previously did research with the Canadian National Institute for the Blind (CNIB) focusing on maximizing the legibility of characters and readability of text, and the Slate family was designed for maximum legibility for both print and screen.

"[1] Slate Pro is the UI font of the BlackBerry 10 operating system.

[2] OnePlus Slate was formerly the brand typeface of OnePlus and was an optional UI font for their Android-based OxygenOS since version 4.5.7, instead of Roboto.

[3] The font has 6 weights (Thin, Light, Regular, Medium, Bold, Heavy), but no italics.