It's a very nice LaTeX editor, and it works a lot more transparently than most others. Beware, though, that since it's online, you are fully dependent on Overleaf to be up and running. It usually is, of course, but I've had a LOT of 'sorry, could not compile due to server error, try again later'---which is basically like saying 'woopsie, the 500 page dissertation you spent 4 years on does not exist for now'. Other than that, I'm a very satisfied customer, and the paid account is well worth it.
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An online LaTeX editor that's easy to use. No installation, real-time collaboration, version control, hundreds of LaTeX templates, and more.