Great tool! The Firefox add-on works like a charm, also Google Docs integration is perfect.
But the LibreOffice extension (paid version) is crap! Even when following all the guidelines, it won't work. Some functions do, sometimes - until they crash. But all in all this is a big disappointment, and completely useless.
Maybe it does work with MS Office, but that's not really relevant here.
So, online it's great, offline it sucks! Therefore only 4 stars.

I don't understand why so many people think this should be totally free and use this argument for skipping a star. Nothing is free in this world, and the free version is already excellent for most applications and far more comprehensive than free versions from other companies.
When you are using this professionally, the price is better than fair. When you're using this for fun, be reasonable and appreciate getting great value for nothing in return from your side!

I think It's better than Grammarly.

This add-on works very well for me. The comma suggestions are just what I was looking for :).

Works great, and has great features, recommended.

Ich bin hochzufrieden mit dem tool. Es hilft mir auf vielen Seiten die ich bearbeite.
Vielen Dank

Es un corrector excelente y me ha evitado publicar con errores gramaticales, imperdonables. Lo recomiendo.

Trés bien

Edit: I checked on other browsers and found that firefox was the one logging out all the properties of the event parameter passed into the eventListener, it was not your addon, sorry

Excellent application for grammar verification.

Not just functionality but an absolute joy to use.

very good

The tool works perfectly. It was so convincing that I took the premium version. The only real trouble I have with the tool is, when I write text in a language that it does not correct or when I write multi-language texts.