I'm working through Genki myself and I really don't like how their vocabulary sections are random sometimes... for example in Genki 1, chapter 8, they will tell you the words for summer and winter, and leave you hanging for spring and autumn. Maybe this was done intentionally, I don't know, but I use a paid iphone app called "Midori" to look up words that I don't know frequently. It's like a mix between dictionary, translation, and vocabulary list, which I find pretty helpful at times. They have vocabulary/kanji lists by grade/jlpt level/frequency which is kinda helpful, and you can write in english/romanization/hiragana when you want to look up words. I supplement these word searches with google translate of course, and wiktionary.

Besides that, I've used both anki and memrise, and I think that they are alright if you find a good deck of cards to download (pretty easy to find). I rather just listen to songs, look at their lyrics, and then look up the words that I don't know though since its a lot more fun that way to me haha. Lastly, there's a free chrome extension that I learned about recently called "Rikaikun". I haven't used it much yet, but its very powerful since you can just hover over japanese words/sentences and a small popup appears telling you the translation and other information. Give it a try at the NHK easy news website and I think you'll be impressed too.

I heard that once we finish genki 2, we'll know about 70% of the everyday vocabulary used, so good luck!