MOSAlingua is an SRS flashcard app that provides useful phrases beyond the typical travel sayings you will find in other phrasebook apps. However, you will need need to use other resources if you are hoping to achieve fluency.
After choosing your level or taking a placement test, you can learn through their bank of pre-made lessons and dialogues, or choose which flashcards you would like to focus on. As you progress, bonus lessons such as proverbs, quotes, jokes, and fun facts can inspire you to achieve more in your learning. To better understand new phrases, the app links to WordReference, Tatoeba, Twitter, and Google pronunciation to give you more context.
If ever you are on the road and can’t look at a screen, hands-free mode will help you learn new phrases or review old ones by focusing on listening and repeating. All the content is offline, so you don’t have to worry about data or wifi for your studies.
Overall, MOSAlingua seems like a useful app for learning new words and phrases. Unlike most other apps, upgrading to premium from the free content is permanent, although some bonus content comes at an additional cost.