I built a variant of this for learning Japanese (and soon more language pairs) by reading. It tracks (on your local device/personal iCloud) all the words and ka

I built a variant of this for learning Japanese (and soon more language pairs) by reading. It tracks (on your local device/personal iCloud) all the words and kanji you read, the sentences that contained them, and the original source materials. So when you encounter a word, you can view your personal corpus of example sentences and articles to reference from your reading. I plan to expand this to a general purpose web browser (or a kind of alternative companion reading-oriented browser). https://reader.manabi.io https://reader.manabi.io