Tesla 21 by Nikola Kovanovic is a free digital display font with the sharp, segmented logic of old LED clocks and calculator screens. The characters are built from faceted modules with clipped corners and thin inline detailing, so the whole font feels brisk, mechanical, and a little retro-futurist.
It fits naturally in tech posters, scoreboard-inspired graphics, arcade flyers, app splash titles, and control-panel branding, where that segmented rhythm does most of the talking. As a free font, it also suits short headlines, title cards, and badge-style marks that need a compact electronic mood without drifting into soft sci-fi.