Most people have already heard of this, one of the best spelling and grammar correction apps presently available on the web. I’ve used grammarbase and several others, but none of them are quite so easy to use as Grammarly. There are two options to the Grammarly service; a basic package is free, but there is an the upgraded version subscription service.
The best way to work with Grammarly is set up an account and install a widget to your browser(s). It’ll appear next to your address bar and run all the time unless you switch it off. As you enter text in a box such as web-based email or web form, Grammarly checks the text and underlines it in colour codes – much as MS Word does – to show you mistakes.
At the end of the form, it shows you the number of mistakes your document presently has. Clicking on that will present you with a pop-up box showing all errors and how you can correct them. It’s not always right; it sometimes mixes up its tenses and other times struggles with British-English terms, but for the most part it is reliable. This part of the service is free.
You may also download free a small plug-in for Microsoft Word and Outlook with the same services for the wordprocessor and the same advertising and promotional tools to encourage you to upgrade.
2016 UPDATE: THE FREE PACKAGE IS NOW AVAILABLE FOR MS WORD AND BRITISH ENGLISH AND AMERICAN ENGLISH DICTIONARIES ARE MUCH IMPROVED
Has anybody used this and can comment on whether it’s worth the upgrade?