Tuffy, created by Thatcher Ulrich, is a free humanist sans serif with a plainspoken, friendly tone. The letters feel open and relaxed, with softly rounded joins, a broad T, and those slightly old-style f and y shapes giving the font a warm, bookish pull instead of a slick geometric one.
That makes it easy to picture on editorial pages, software interfaces, educational materials, packaging, and straightforward branding, where a free font can carry text and short headings without feeling sterile. It also suits chapter openers, pull quotes, cover lines, and title cards, because the shapes have enough character to stay memorable while still looking calm and workmanlike.