The goal of Rainbow Math is to investigate what font-related changes can be made to aid students with dyslexia and other learning disabilities. As part of the initial step, we developed software that allows students do customize coloring of text, modify the text’s spacing and style on a per-character basis. Additionally, students can use color to visually distinguish what is between parentheses, brackets, etc. Testing with 13 middle school students showed that most students liked larger fonts, extra spacing between operators, bold fonts, and highlighting of parenthesized expressions. Their self-chosen preferences resulted in decreased reading times and decreased errors.