Verificador by SIGNUM® is considered to be the best spell checker for Spanish texts. The program combines high quality features, such as:

• The most complete Spanish lexicon comprising more than 5 million words, including colloquial expressions from Latin America and Spain. It also includes technical terms of different fields like agriculture, biology, commerce, and others. Furthermore, it recognizes all conjugations, diminutives, augmentatives, pejoratives, as well as the most common suffixes and prefixes.
• Easy to use due to its user friendly spell checking window that allows you to review texts written in different word processors.
• It adapts to your spelling skill level. From professional writers to beginners, it enables you to adjust its revision detail level.