Grammarian PRO3

Grammar Checker - Mac

Use our grammar checker anywhere you type

Check your writing style. Check for racial, slang, wordy, vague, sexist phrases, euphemisms, and more. Only Grammarian does it.

Recent customer responses:
Grammarian testimonial Ray Willhite: I love your program. Grammarian testimonial Julie Gomez: Awesome!
Grammarian testimonial Shelden Curry: I love this product. Didn't realize how much til I lost it! Grammarian testimonial Daniel Wade: I'm a looooooong-time customer of your company.
Grammarian testimonial Lavoie Jean-Pierre: I love Grammarian. Grammarian testimonial Martin Kaynan: I love it!
Grammarian testimonial Carolyn Carlisle: I credit Grammarian for helping my children improve their grammar. Grammarian testimonial Penny Cherubino: I do love the product and would like to continue to recommend it to other journalists.
Grammarian testimonial Jamey White/Apple Computer/Lead Technical Editor: My team has a 35-seat license for Grammarian Pro. We're all working on OS X Mavericks, using Grammarian Pro 2.0.6. Grammarian testimonial Patti Bradfield: You have the best product on the market and the best, BEST customer service.

Grammar Check

Grammarian PRO3 X, the professional writer's tool kit, is the ultimate Mac grammar check writing tool to combat those embarrassing writing errors that everyone tends to make.

Main Grammar Check Document View

A universal interactive grammar check, contextual spelling check, punctuation check, dictionary, thesaurus, AutoCorrect, and AutoType tool that virtually works within every program on your Mac computer. Grammarian PRO3 is the best grammar checker tool ever made.


Try before you buy. The Grammarian product download is a 7 day trial commercial app demo. Buy a license to unlock the demo into a full nonexpiring licensed copy. Sale is final once an activation code has been purchased and issued. For Mac. Click "Buy Now" to buy a license:


    Why You Need Grammarian PRO3

    A few reasons:

    • Grammarian PRO3 X is the world's first grammar checker originally developed on an Apple II in 1983. It is time-tested and is the best grammar checker ever made. This Mac grammar checker is undoubtedly the best!

    • Check Grammar, Check Spelling, and Check Punctuation here, there, and everywhere. Wherever you write, Grammarian PRO3's Mac grammar checker is there. Grammarian PRO's grammar checker features are universally available, anywhere you enter text, in all applications-word processors, email, web browsers, and all other applications.

    • Easy and powerful. Convenient and easy to use. All commands are accessed from a global universal Mac system menu.

    • Automatically save time and keystrokes. With Grammarian PRO3's AutoType, you type a few letters and Grammarian PRO automatically expands them. Save precious time and keystrokes. Insert standard greetings, phrases, and signatures as formatted text. Correct typos automatically. Insert the current date and time in any preferred format. And do so much more.

      Qualified and reporting for duty. Whether you are writing an email, a class essay, scientific articles, or your PhD Doctoral Dissertation, Grammarian PRO3 will assist you along the way. Remembering all the proper grammar and spelling rules from previous academic terms/years can be difficult. Implementing those rules is another matter entirely. Let Grammarian PRO help you. After all, Grammarian PRO3 has over 30 years of dedicated educational lab research and is qualified to assist you.

    Feature-rich all-in-one Grammarian PRO3:

    • Grammarian PRO3 X is an all-in-one Mac grammar checker, spelling checker, punctuation checker, style and phrase usage checker, and more. Grammarian PRO3 X reads through your text and analyzes each sentence for potential grammar, spelling, and punctuation problems.

    • Has much more spelling and grammar check power than the limited and crippled checkers in Microsoft Word™, Microsoft Office™, and the macOS. See our Grammar Checkers: Comparisons Testing

    • Has over 300 built-in primary spelling and grammar check writing rules compared to MS Office's 26 error corrections.

    • Checks homophones-words that sound the same but are spelled differently such as it's for its, accept for except, loose for lose, to for too and two, and many more.

    • Reference aid displays parts of speech and linear sentence diagraming, to assist with evaluating the right choice of corrections.

    • Check spelling interactively as you type or all at once after you type.

    • Grammarian PRO3 works in word processors, email applications, and web browsers, almost anywhere that you can enter text.

    • Write faster, better, and with more confidence using Grammarian PRO3's extensive AutoType and AutoCorrect features.

    • Grammarian PRO3 corrects typo mistakes, grammar errors, spelling errors in or out of context, phrase usage, and punctuation errors. Grammarian PRO3's AutoType feature will save you much time by typing your commonly-used words, phrases, and paragraphs for you.

    Grammarian PRO Menu and Lookup

    Spelling and Grammar Check

    Grammarian PRO3 X works interactively or in batch correction mode and automatically starts working in your applications to correct spelling, grammar, phrase usage, and punctuation. Use the built-in dictionary assistant to look up definitions and verify the correct choice of words. AutoCorrect corrects many spelling mistakes automatically as you type. Also, create styled-text AutoType shorthand macros that will automatically type your commonly used signature phrases. Checks your spelling, grammar, phrase usage, and punctuation interactively as you type!

    Spelling and Grammar Check as you type

    Grammarian PRO Grammar Check Interactive spelling checking When interactive checking is turned on, Grammarian PRO3 watches what you type so you can make corrections as you are writing. Grammarian PRO3 can alert you when an error is detected with your choice of selectable sounds or voices. You can set different alert sounds for each error type. Whenever Grammarian PRO3 sees that you have made an error, a list of suggested words appears. You can choose to see the list in a window or in a pop-up menu list. The list is comprehensive; and so, when you find the correct word, simply double-click it with the mouse or type in the number beside the right word. Grammarian PRO3 will instantly and automatically make the correction for you.

    Spelling and Grammar Check anytime

    Grammar Check Document SelectionTo check your document after you've finished typing, use Grammarian PRO3's 'Check Selection...' command. Grammarian PRO3 pastes corrections into your document all at once. Interactive checking and after-the-fact checking aren't mutually exclusive. Let Grammarian PRO3 check your spelling as you type and also check your grammar and spelling afterwards all at once just before you send off your document. Grammarian PRO3 maintains all style formatting in your documents. PC-based web browser copy/paste grammar checkers do not maintain document character formatting. Only Grammarian PRO3 keeps all document character formatting intact.

    Improve All Writing

    Academic, business, professional, publishing, technical, and creative writing require unique styles of editing. Grammarian adapts to your writing needs and ensures that no whatever your project is that your grammar is correct. Just choose the projected writing style of the writing that you need to be edited, and voilà! Download Grammarian now to get started.

    Students and educators
    Research Papers, term papers, book reports and essays
    Job Applicants
    Edit resumes, application forms, cover letters
    Business writers
    Refine emails and proposals
    Professional Writers and copywriters
    Grammar check instruction manuals and ads
    Authors and Copy Writers
    Proofread editorials, articles, and blog posts

    Grammarian PRO3 types automatically

    Let Grammarian PRO3 fix typo mistakes, smarten punctuation, finish what you've started to type, and do the repetitive typing for you. Automatically, instantly, invisibly-often without you even noticing.

    AutoType-Automatic typing of styled text

    Grammarian PRO3 can save many hours of typing and wear and stress on your hands and wrists-all by typing for you. Using Grammarian PRO's AutoType typing expansion feature, you can create self-expanding AutoType shorthand abbreviations that save you typing and ensure spelling consistency. Create hundreds of shortcuts to boilerplate text responses, long URLs, entire signatures, addresses, names, phrases-anything you find yourself typing repeatedly. Grammarian PRO's AutoType shorthand expansions can include dates and times, formatted almost any way you'd like.

    AutoCorrect-instantly fix typo mistakes

    Grammarian PRO3 automatically corrects many commonly misspelled words and typo mistakes. Grammarian PRO3 includes a list of close to 4,000 common typos (for US English) and spelling mistakes. Add your own automatic corrections-there's virtually no limit of the quantity that you can create and use!

    Let Grammarian PRO3 automatically fix those DOubled CApitals, capitalize the first word of a sentence, and fix capitalization of proper nouns-instantly and automatically. Write like a professional-have Grammarian PRO3 automatically "smarten" quotation marks and other punctuation to be typographically correct. Grammarian PRO3 does it all.

    Grammarian PRO3's dictionary and thesaurus

    Grammarian PRO3 Dictionary and thesaurus

    Use Grammarian PRO3's thesaurus to find synonyms and related words. Grammarian PRO3's built-in U.S. English thesaurus offers over two million entries for almost 250,000 words. Entry words contain definitions and parts of speech.

    Finding the right word couldn't be easier. Look up the word selected in your document, or look up a word that you type into the Lookup window.

    Grammarian PRO3's spelling and grammar check error catching

    Grammar Check Error List According to comparative studies, Grammarian PRO3 X has always been the leader of grammar and spelling. And now again, nothing comes close to the accuracy, quality, and intellectual power of Grammarian PRO.

    Grammarian PRO has the most comprehensive error check capability. Nothing has ever matched Grammarian's depth and completeness. You rely on the creditability of the spelling and grammar check application, and accuracy is the key to creditability. And Grammarian PRO3 has over 300 built-in primary spelling and grammar writing rules compared to MS Office's 26 error corrections.

    Writing Rules, Phrase Usage, Grammar, and Punctuation

    Grammarian's error checking is categorized into writing rules and writing styles. This allows you to customize Grammarian PRO3's grammar check according to your current or projected writing style. Grammar errors are grouped into phrase usage, grammar mechanics, and punctuation. Check for stylistic phrase usage errors such as Bookish Phrases, Cliches, Compound Words, Euphemisms, Formal, Faulty, French, Generic, Informal, Latin, Overly Formal, Racial, Redundant, Sexist, Collegiate, Vague, Wordy, Legal, and more. Check for textbook reference errors as Grammar Mechanics. The errors of this type now range from elementary to undergraduate course study. The error classes of this type include Misplaced Squinting Modifiers, Dangling Modifiers, Missing Prepositions, Subject-Verb Agreement, Antecedent Reference, Improper Parallelism, Double Negatives, and so many, many more. With over 28 years of research and lab work, Grammarian PRO3 provides the most sophisticated error checking ever. This is capable only because of Grammarian's underlying Linguistic technologies and innovative connective algorithms designed and owned by Linguisoft. Decades of research and innovative design make this possible. Simple Natural Language Processing, Generative Grammar, Structural Linguistics, and Cognitive Linguistics are primitive (caveman) terms compared with today's standards of Linguisoft's Grammarian PRO3.


    Grammarian PRO3, the most powerful spell checking in the world, includes grammar-check-lite spell checking and additionally checks for such spelling errors as: word compounding, homophones, spelling out numbers in a sentence, capitalizing of proper nouns, and more. ONLY Grammarian PRO even makes spelling suggestions based on how words are used in the sentence.

    Homophones-not misspelled but spelling is incorrect...

    Have you ever used the word it's as a possessive pronoun when you meant to use its. Or maybe you wrote to complement someone instead of compliment them. Well, these words are not misspelled but the spelling is incorrect depending on the context that the words are used. Grammarian PRO3 spots correctly spelled words that used in the wrong context. No more embarrassing typos like it's-its, complement-compliment, then-than, to-two-too, lose-loose. Homophones are common spelling and grammar check errors. And common spelling checkers cannot catch these errors. Grammarian PRO3's spelling and grammar check easily catches them, and other than a trained human editor, ONLY Grammarian PRO3 catches them.

    If you are a dyslexic typist, Grammarian PRO now helps you more than ever. PRO3's spelling and grammar check has the most comprehensive homophone checking ever. Nothing has ever before been successfully capable of checking and correcting these types of spelling and grammar check errors.

    And true multilingual contextual spell checking

    Grammarian PRO3 is ideal for multilingual applications. Check spelling in up to 17 different languages:

    • U.S. Flag US English
    • British Flag British English
    • French Flag French
    • Canadian Flag Canadian English
    • German Flag German
    • Swiss German Flag Swiss German
    • Italian Flag Italian
    • Spanish Flag Spanish *
    • Swedish Flag Swedish
    • Dutch Flag Dutch
    • Australian Australian
    • Portugal Flag Portuguese
    • Brazil Flag Brazilian Portuguese *
    • Denmark Flag Danish
    • Japan Flag Japanese
    • Turkey Flag Turkish
    • Norway Flag Norwegian

    Multiple languages simultaneously, available everywhere.

    Get Statistics and Analyze the Statistics

    Grammar Check Ststistics screenshot Use Grammarian PRO3's Statistics to determine your document's readability, along with the number of paragraphs, sentences, words, characters-even syllables. Check how interesting your writing is (Human Interest) and how difficult it is to read (Reading Ease). And let Grammarian PRO show what best famous writing that is comparable with your writing.

    Use Grammarian PRO3's Statistics Analysis to show sentence-by-sentence graphs of Sentence Length, Human interest, Readability, Passive Sentences, Nominalizations, and Coherence words and phrases.

    Your professional advantage

    Write, edit, and review. Use Grammarian PRO3's professional Statistics tools to review your writing in order to target your audience.

    What's New in PRO3

    Learn More: Why is our grammar checker really the best? An honest comparison study can show the structure checking depth of the current crop of grammar checkers: Grammar Checkers: Comparison Tests.

Grammarian PRO3 X takes full advantage of macOS and works within such applications as: Apple's Pages, Apple Mail, BBEdit, Microsoft Office, Nisus Writer Express, Scrivener, Storyist, TextEdit, Ulysses, and many more.

And, Grammarian PRO3 helps you to write mistake-free on Gmail, Facebook, Twitter, Tumblr, LinkedIn, and more.

Grammar check markup/similar words 10 Most Common Grammar Mistakes to Check For In Your Writing

And Grammarian PRO3's grammar check catches them for you:

1) They're vs Their vs There

Their less likely to cause trouble. They're less likely to cause trouble.

Their is a new house down the street. There is a new house down the street.

2) Its vs It's

Its a good day today. → It's a good day today.

3) Then vs Than

It was larger then the requirement stated. It was larger than the requirement stated.

4) Dangling Modifiers

Having walked on the bridge, a wallet was found. While having walked on the bridge, we found a wallet.

5) Lose vs Loose

I will not loose my wallet. I will not lose my wallet.

6) Farther vs Further

The student read farther in the textbook. The student read further in the textbook.

7) Subject Verb Agreement

A small percentage of the people wants a job. → A small percentage of the people want a job.

Twenty dollars are due. Twenty dollars is due.

8) Use of Commas

We have dogs, cats and a hamster. We have dogs, cats, and a hamster.

9) Who vs That

The lady that just joined went with us today. The lady who just joined went with us today.

10) Less vs Fewer

Less people attended than before. Fewer people attended than before.

Grammarian PRO3's Mac grammar check finds and corrects hundreds of thousands of complex writing errors — so that you don’t have to!

Grammarian PRO3 works offline without an internet connection. Grammarian PRO3 is a seamless integration of the macOS and your work flow.

System Requirements:


* Grammarian PRO3 X for macOS 10.9-12.0 (Monterey)
* Grammarian PRO2 X for macOS 10.6.8-10.14
* Grammarian PRO X for macOS System 10.4-10.5

* Grammarian PRO3 X free online grammar check: Any mobile or desktop browser


NBC Nightly News:

Americans' bad grammar costly. When the words are far from perfect and the boss has had enough.

Brian Williams, "We're in a bad grammar epidemic in this country. Perhaps, you've seen signs of it yourself in memos, documents, and computer-speak on the internet. Grammar and spelling have really gone the way of the black-and-white television set these days. What happened to the English language?

Why has grammar gotten increasingly WORSER?" "It seems us Americans ain't talking too good, don't write worth a lick, and worser with emails." states NBC's Roger O'Neil. "Our grammar, punctuation, and spelling are/is abysmal. And Corporate America is saying STOP! A recent survey found that Fortune 500 companies are spending more than 3 billion dollars per year retraining workers in Basic English. Even writers have trouble writing." Business Writing Instructor, Roger S. Peterson, states "We simply now must salvage American English."

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