About Word Catchup
Place Article written in english what you want to read , This App analyze the article. All the words in the article will be showed in a new window, if there is a word you already know check these words, then you will never see these words again. Is there a word you don't know ? then click search button, It will lead you to dictionary site.
Word lists that checked as you know may saved to Google drive, so it will never show these words while you use other devices.