DeepL
Translates web pages, selected text and what you type into other languages, and helps polish your writing as you go.
Chrome extension
Highlights unfamiliar words on websites and in YouTube or Netflix subtitles and translates them, so English learners grow vocabulary.
Relingo highlights and translates unfamiliar English words on web pages and in video subtitles in Chrome. It is for English learners who want to build vocabulary gradually while reading articles or watching YouTube, Netflix and other videos.
Set your English level after installing, then browse normally; Relingo highlights words it thinks you may not know and translates them when you hover or click.
It is focused on learning English. Page and subtitle text is processed to find and translate words, and vocabulary syncing relies on the developer's service.