Is there an online spaced repetition dictionary?

Question

IT education

In general, I already got tired of googling and comparing resources (so don’t send it there). Decided to ask people's opinion.
In general, there is a case - I read books on a laptop (under Windows) at home and at work. Some words (to be honest - many) I do not know. We need an online service (preferably free), which:
1. By selecting a word in the browser, it gave its translation.
2. Added to the dictionary for interval repetition.
3. The ability to repeat words should be on the Android phone and on the desktop.

Answer 1

well, by default lingualeo.com

Answer 2

If you read books in the original, you are here - babeleo.com . And interval repetitions are also planned there in the functional.

Answer 3

LinguaLeo + their Chrome extension

Answer 4

sentences.mobi