Flowlingo allows you to browse websites and news articles in your target language while providing instant audio and visual translations when you tap on unknown words. They use an SRS based flashcard system to help you remember words you don’t know, and will automatically save flashcards from words that you translate. This does mean, however, that you have less control over what is recorded in the flashcard deck, especially with the possibility of accidentally tapping on words you already know.
The free content on Flowlingo’s app allows you to search the web and have access to instant translations. With a premium subscription, you can watch popular TV shows and movies, and upload your own books.
The app seems to still be under development, and it is unclear whether the flashcard system only records unknown words with a premium subscription, or if the app currently has a bug. Either way, this is probably a good app to look into at a future time, but there are currently more refined apps that provide similar content. Check out Yabla to learn languages through videos or Readlang for flashcards and translations from webpages and other texts.