Very good idea but it needs a clearer structure. The repetition quiz format for vocabulary is a great idea and very effective but there are 500 lessons with no progress chart to help remember what you have learned etc. The verb trainer could be simplified. I use another verb app which just has 3 groups of different conjugation for each verb which you can choose individually to break things down - for example (1) Present, Future, Perfect, (2) Imperfect, Conditional. I find here there are too many level options and after learning German for over 10 years knowing if a verb is strong, weak or auxiliary doesn't really help in learning.
• A new module test your ability to parse and decline a representative selection of German nouns.
• A new setting makes the interface more accessible to users with red-green colourblindness.