Full access to the first 50 lessons is and it is money well spent.
Duolingo won the “best application” award in 2013 in the Apple App Store.
It tracks your progress in an encouraging way and focuses on 1,500 of the mostly commonly used words in the Spanish language.
Rosetta Stone is arguably the most well-known language-learning tool, and also the most intensive.
One distinguishing factor is that it attempts to immerse its users in Spanish immediately without explaining and translating everything in English, as if you were learning Spanish as a child, instead of as an adult, which is most likely how you acquired English (or your native language).
First time in Spain, and on the beautiful Costa del Sol.