At Tooltivity.com, we manually test productivity browser extensions and provide honest and detailed reviews.

Grammarly received an impressive rating of 8.8 in our tests. We evaluated it based on features, design, ease of use, security & privacy, value for money, and performance. You can find the full test report here: tooltivity.com/extensions/grammarly

It condenses my words to be more accurate and understandable.

I am sure this app works great, but it is not what I want because it will not correct my spelling with out purchasing an upgrade.

does not work on firefox at all

Can't do spell check anymore, needs Premium. But getting a lot of features, which may Improve the writing, but looked behind a paywall.
Now it only shows me, that I have done something wrong, but doesn't show me that.
For a non English Native, it helped me a year prior, but not anymore.