Undulate was designed as an alternating-letter font in which two sets of characters alternate. The alternating is done automatically in applications that support the OpenType feature contextual alternatives (calt). Some individual characters look strange in isolation but they fit into a wave-like pattern in which shapes that bulge up alternate with shapes that bulge down.

Undulate has monospaced and monoline letters. The letter spacing is very tight to accentuate the ripple pattern. The family includes an outline style that can be used in a layer above the regular style to add color. Undulate was not designed for any particular use but as a challenge to fit letters into a particular geometric shape. The unusual patterns that a result are eye-catching and may be useful for advertising or signage and in other places where one wants attention-grabbing lettering.