A perfect, FOSS tool, that I believe is better than things like grammarly. It is amazing how well it works. Nit-pick mode and the recent addition of synonyms really help when you quickly need to get work done and are a bit too frazzled to do the lifting yourself.
Even for my weird language, the grammar and nit-picking is on point. Highly recommended, I pay for the full service (though I do not strictly need it) to support this great initiative.