Introducing Aptos, our modern successor to Calibri By Si Daniels Dear every human on earth that’s ever typed text, For 15 years, our beloved Calibri was Microsoft’s default font and crown keeper of office communications, but as you know, our relationship has come to a natural end. We changed. The technology we use every day has changed. And so, our search of the perfect font for higher resolution screens began. The font needed to have sharpness, uniformity, and be great for display type.