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GREGMC I have Grammatica and Grammarian by Linguisoft. I purchased Grammatica because I wanted a grammar checker that worked as a separate app; Grammarian works via the input source menu, which on occasion causes minor system clashes. On the whole, Grammatica works well for spelling, however, checking grammar simply doesn't work. It fails to correct my "it's" when I should type "its" (and vice versa) and doesn't have a clue about the use of commas, colons, or semicolons. If you want it to pick up on a dangling preposition or whether a sentence is in a passive voice, forget it. Grammarian by Linguisoft is a much better grammar checker that, despite its quirks, I use daily. Grammatica, unfortunately, simply doesn't compare. Looking at the preferences panes for both apps makes the difference clear: Grammatica has a very simple preference pane, with no options for customising how it checks (or doesn't check!) your writing. Grammarian's preference pane has hundreds of options, a complete set of rules on grammar which the user can customise for his/her own use. In short: Grammarian, a copy of The Elements of Style by William Strunk & E.B. White, the Oxford English Dictionary, and the Oxford Thesaurus, and you're covered. (Version 7.0) | 
