Users print a template, write letters by hand, scan it, and upload. Calligraphr builds a font file with options for alternate letters and ligatures so text looks less repetitive. Paid plans allow more characters and variations.
Results depend on the quality of the scan and consistency of the writing. It suits casual script styles more than formal calligraphy.
Fontself and Glyphs are more advanced font tools. Calligraphr suits lettering artists who want a quick font.