It helps a lot. I'm not a native speaker but I use English quite often to communicate. And there's no need to worry about spelling and prepositions anymore!

Pros:

It corrects me better than my tough Siberian teacher!

Cons:

None

I just love it!

Pros:

It's beautiful and powerful!

Cons:

Do not work in some essential apps, like Google Docs

It would be much more efficient if it can be integrated with Google Sheets.

Pros:

It does what it says. Pretty efficient as well.

Cons:

The basic version points out things that anyone can see. And the premium version is too pricey.

Very seamless and useful

Pros:

best product for grammar

Cons:

French is not available yet

Great tool for students and professionals alike

Pros:

Great tool that works on most websites

Cons:

It doesn't scale with some comment boxes that can be scaled

very important product, especially for non-native speakers.

Pros:

Really powerful

Cons:

English only

I've been a Grammarly for Chrome user for the past couple of years and it has been a fantastic plugin. I use it everyday.

Pros:

Simple and ease of use.

Cons:

None.

I paid for the premium version just because I loved the product so much.

Pros:

Works inline

Cons:

Not many, but wish the syntax checker was better.

I also like definitions by Grammarly just by double-clicking on a word. Great tool!

Pros:

Best writing plugin!

Cons:

Not available in french.

I use grammarly in my every day practice. It's really handy tool.

Pros:

Can be used anywhere

Cons:

price

My writing + emails have improved manyfold after I started using this. One of those products I'd pay to use any day!