Make the flashcard system for customizable
Here's a suggestion I think could be helpful. I read on here before someone suggested that you set up the flash card system where you would have to choose which words you wanted to learn through flash cards but you said you didn't want to do that because than youd have to create this whole "pop-up" feature where it would be distracting and take more time to get through the text and you based this system on making reading an enjoyable process with fewer distractions which I totally understand. I think if you implemented my suggestion you could get a compromise so that it would work for people that don't want this pop-up but also don't want to learn every word they translate or have to go through the hassle of delete the words in the flash card system(which is a bit of a hassle honestly) Here's what I suggest: You could make it to where the user can choose by "word frequency" whether it goes in the flash card system or not. For example, I could go into the settings and choose to have a word only go into the flash card system if I click on it 2 times, or 3 times, 4, or 5, etc. Or keep it with 1. It really comes down to personal preference. The problem I have personally with every word going into the flashcards to study is the fact that there's many weird words Microbiology that I don't care to learn. There's simply a lot more vocabulary that is seen more frequent and more important. If you're learning a foreign language you are not going to need every foreign word you come across. You really only need like 90% of the most frequent words to pass as fluent so as far as all these other, it's kind of wasting my time trying to learn them. See my point? Just a suggestion. I like your site, I think it could really be great, it's good now but it could be great, know what I mean?