Drag a variable font over this window.

The Variable Font Substitution Mapper

To get started, drag a variable font .ttf over this this window. This tool will try to parse the file and give you a visual interface for designing glyph substitution patterns (also known as OpenType Required Variation Alternates). Think about the dollar sign with ($) and without ($) the vertical bar. For more extensive documentation on using this tool, check out our repo on Github.