Oh Boy, What shall I tell you about this excellent piece of a program from Grammarly? Just the best, it has helped me a lot to improve my English big time, It's fast for remedying your English, as well as challenging to let you think more to change the way you pick your sentence and the words, by giving you hints and explanation. My writing has improved dramatically with the help of this well-made program. Both British English and American are available for your service.