Inter font family
Inter started out in late 2016 as an experiment to build a perfectly
pixel-fitting font at a specific small size (11px.) The idea was that
by crafting a font in a particular way, with a particular coordinate system
(Units Per EM), and for a particular target rasterization size (11), it would
be possible to get the best of both sharpness and readability.
However after a few months of using an early version of Inter, it dawned
on everyone exposed to the test that this approach had some serious real-world
problems. Most notably that it was really hard to read longer text. Because of
the pixel-aligning nature of that approach, the font took an almost
mono-spaced appearance,
making it really easy to read numbers, punctuation and very short
words, but eye-straining to read anything longer.
The project was rebooted with a different approach, sticking with the
specific UPM, but crafting glyphs and kerning in a way that made for
more variation in the rhythm and smoother vertical and horizontal stems.
As Inter was being developed, it was tested on an internal version of
Figma—where the author of Inter works as a designer—and slowly improved upon based on experience and feedback.