The Slovak proofreader finds errors in a text and it suggests corrections.

The proofreader's vocabulary includes approximately 66,000 word roots. It contains rules for the use of prefixes, algorithms for deriving different word types, as well as algorithms for recognizing numbers. Based on the above data and algorithms, the language proofreader module can recognize up to 9 million different forms of Slovak words.

The proofreader was created on the basis of an extensive corpus of texts from various areas. It contains all the latest codification manuals in the Slovak language, namely the Rules of Slovak Spelling and the Short Dictionary of the Slovak Language. In addition, a large number of foreign and technical words used, as well as names, are added.