SpanishReadability.com is a free website for English-language and Bilingual writers in the U.S. to score the readability of Spanish text, from young readers to adult readers. Parts of code that process Spanish text through various formulas were programmed by Alejandro Muñoz Fernández of Legible.es. Updated code and additional formulas were programmed by Brian Scott of ReadabilityFormulas.com.

Special thanks to Alejandro for providing background information on Spanish formulas at his website. His insightfulness helped me research them further to gather information about the history of each formula and to validate their calculations.