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Jack Kinsellaleft a comment
Massively underrated in terms of upvotes here. Examine should be your first port of call before buying any supplements.

ExamineIndependent research summary on supplements & nutrition
German Grammar Spy (Der Die Das) is a study aid for German learners to help them master the most tedious and difficult part of German grammar: the articles.
It does this by teaching the ~50 rules/signals for gender (e.g. "nouns ending in -ung are usually die"), focusing on the 5000 most frequent words, and employing SRS to schedule revisions.

German Grammar Spy (Der Die Das)Learn The Rules Behind German Genders
