Brainscape has Spanish Vocab Genius (iTunes Link) in the iTunes App Store for FREE for a limited time.

Boost your Spanish vocabulary FASTER than with any other app on iTunes. Applying the latest in cognitive science, Brainscape introduces vocabulary words in order from most foundational to most complex, and repeats them in a pattern that is just right for YOUR brain.

Rather than creating frivolous games or distracting quizzes to try to make learning “fun,” Brainscape provides a scientifically optimized algorithm to repeat flashcards in just the right pattern for your brain’s maximum absorption, based on YOUR confidence. Brainscape makes sure that your study time is used as efficiently as possible, because – let’s face it – you are busy!