Apps like B1-Deutsch

Here are some great alternatives to B1-Deutsch by Deutscher Volkshochschul-Verband :
DW Learn German
DW Learn German
★4.3
German Declension Trainer
German Declension Trainer
★5.0
A1-German (A1, A2, B1)
A1-German (A1, A2, B1)
★4.5
Wlingua - Learn German
Wlingua - Learn German
★4.9
German-English Dictionary
German-English Dictionary
★4.5
Learn German Speak Language
Learn German Speak Language
★4.5
Goethe Prep - Practice A1 A2 B
Goethe Prep - Practice A1 A2 B
★4.3
Learn German for beginners
Learn German for beginners
★4.2
Learn German
Learn German
★4.1
Learn German A1 for Beginners!
Learn German A1 for Beginners!
★4.6
Test zur deutsch grammatik
Test zur deutsch grammatik
★4.3
Learn German
Learn German
★4.1
German alphabet for students
German alphabet for students
★4.2
Learn German for beginners
Learn German for beginners
★4.8
Learn German 1000 Words
Learn German 1000 Words
★4.6
Learn German – Studycat
Learn German – Studycat
★4.5