"Learn German Grammar - Free German Grammar" is one of ongoing apps for self-learners who want to speak
This application is good for learners on both beginner and intermediate levels
German Grammar easily and effectively With 115 daily dialogs,All important
German Grammar topics are covered in this learning language application
a list of lessons with various topics from greeting,

Feature :
You can use it online and offline
Great app to improve your vocabulary, grammar.
Free correction "tense, articles, verbs,irregular verbs, verb conjugation, passive,"