the best

It does not know the difference between there and their.

I like the accuracy and the speed of Language Tool, it's just awesome ;)

good

This stupid thing wants to change words for no apparent reason.

Good grammar spelling checker, but he missing some language like Bulgarian.

Muito bom, mas poderia ficar melhor. Se conseguisse instalar. A extensão cansa, de ir para lá... E para cá. Mas nada de instalar. Por favor não poluir o e-mail com robôs.