I've had some success with this app. It's free and there are a good amount of languages on there. Plus it's perfect for a 15 minute train ride instead of sitting down for an hour long session
That said, the best way to really learn is to leverage a combination of apps / programs. Just sticking with one, you’ll get bored. There’s so many free tools now to leverage beyond Fluenz such as YouTube videos and podcasts.
And, ANKI. Use Anki. Any new word or phrase or rule you learn, record it in ANKI in real time.
This got me passable at what I call "bar, taxi and restaurant Spanish.
I suplimented it with Duolingo
That said, the best way to really learn is to leverage a combination of apps / programs. Just sticking with one, you’ll get bored. There’s so many free tools now to leverage beyond Fluenz such as YouTube videos and podcasts.
And, ANKI. Use Anki. Any new word or phrase or rule you learn, record it in ANKI in real time.