I made a thread on this a while back, and the answer was basically what you have already gotten: Bunpro. I have used it for a little while now, and it is fantastic. It is not quite as easy to quantize grammar as kanji, so you wont learn grammar solely dependent on it, but it is great. I use Genkis grammar section, and online articles on grammar to learn the grammar, then bunpro to put all in one place and SRS it.
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