90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. Three stars for the most frequent 2,500 words, two stars for the next most frequent 2,500 words, and one star for the next band of 2,500 words.
The Spanish to English side is designed to help Spanish speakers when they are writing in English. As well as translations of Spanish words and phrases, it provides information about relevant English grammatical structures, English collocations, and the cultural connotations of some of the English translations.
On the English to Spanish side, it provides quick and accurate translations to help Spanish speakers as they are reading texts in English.