Recs.
Updated
Memrise [free] is a powerful learning app that systematically helps users learn foreign words and move them to long term memory. This app is completely free and very effective.
SpecsUpdate
Pros
Pro Offline mode
If you can't be connected to the internet, you can always take your course offline and let it sync when you get connected.
Pro It's fun
Unlike some other language learning apps for Android, this app is really fun. It really feels like playing a game, and getting points for making progress is a great motivator.
Pro Free account without a time limit
The Basic account is totally free (has no time limit) and is very generous.
An upgrade (with more features) is available for 9 USD / month.
Pro Learn from natives
Official courses have videos of natives, recorded recently, to help you along. Unfortunately, videos are reserved only for PRO users (there are a few in the free version, just to show what you can get for PRO subscription).
Pro Helps grow your vocabulary quickly
Memrise uses "mems" to increase your vocabulary, which are a way to connect a word to its meaning.
A common example is associating a word with an image.
Mnemonics are another one they use to help you remember new words. For example,
"le parcours" (route or course) could be remembered with the mem "People who do parkour pick their own route".
Cons
Con Most courses teach isolated vocabulary instead of teaching in context
Recommendations
Comments
Flagged Pros + Cons
Pro Easy to use
You will understand quickly what you should do, and you will begin to learn in less than a minute.