I've found Duolingo, free version, O.K. but the organization is too complicated with its bonus points and games, though the repetition of simple words and phrases, on the other hand, makes it easy to use.
In Rome, I never mastered more than a few words, despite having some learn Italian audiobooks (on Audible app). I want to do better in Athens this time round.
I'm overwhelmed by the choices: Pimsleur, Rosetta, Duolingo, Babbel...but I really need to do a serious crash course. Also, there is so much waiting around in airport lounges with really nothing better to do (four hours in Boston and four hours in Paris on the way back to Seattle).
Is anyone familiar with any of the learning language apps and can they recommend one?