Interface is a free and open source font family for highly legible text on computer screens. You are free to use this font in almost any way imaginable. Using Inter is as easy as downloading & installing the font files.
You can see the full preview by clicking the second image above.
Interface font works great for English-language text, and pretty well for other Latin and Cyrillic languages. Feel free to download the latest release clicking on the download button above or try it out in the "playground" (https://rsms.me/inter/lab/).
The story behind Inter
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 the 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.
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You may want to check all the files in the kit before you download
Special thanks to Rasmus Andersson (https://dribbble.com/rsms) for designing and working for this.
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Thank you and enjoy designing!