Grammarian PRO3

6.9easy start · #51of 88
in Grammar checkers

Free trialyes
Well documentedyes
Runs where you workno

Runs on Mac. Paid plans from $59.99/mo.

Grammarian PRO3 is ranked #51 of 88 in grammar checkers on The Geeks Club. It runs on macOS. A free trial is offered. Paid plans start at $59.99/mo.

Grammarian PRO3 plans and pricing

All plans

Premium $59.99/mo billed annually Unlimited grammar, spelling, punctuation, and style checking · Advanced suggestions · Unlimited writing styles · AutoComplete, AutoCorrect, and AutoType linguisoft.com · 21 Sept 2026

Grammarian PRO3 Premium $49.99 once Billed as a payment of $49.99 Unlimited grammar, spelling, punctuation, and style checking · Unlimited writing styles · AutoComplete, AutoCorrect, AutoType · Dictionary lookup linguisoft.com · 9 Oct 2026

Compared on grammar checkers

Free plan: Yes
Browser extension: No
Desktop app: Yes
Style suggestions: Yes

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The record

Purpose: Grammarian PRO3 is a Mac grammar checker for professional writers.
Checks: It checks grammar, spelling, punctuation, style, and phrase usage.
Writing styles: The site lists Chicago, APA, Associated Press, academic, business, casual, chat, common, formal, legal, personal, and technical writing styles.
App integration: The maker says the checker works in word processors, email apps, web browsers, and other Mac apps where text can be entered.
Writing tools: Features include AutoType, AutoCorrect, AutoComplete, a dictionary, a thesaurus, and writing statistics.
Languages: The maker says spelling can be checked in up to 17 languages simultaneously.
Free tier: After the seven-day full demo, the app provides a free limited service with limited grammar, punctuation, and phrase-usage corrections and one writing style.
Offline privacy: The maker says the app works offline, does not collect text data, and does not send text or data over the internet.
AI: The maker says Grammarian PRO3 does not use generative AI to revise or edit.
System requirements: The download page lists macOS 10.13 or later and Intel or Apple M-series 64-bit processors.
Support: Support is available by email or web form, and the app includes a built-in manual; the maker says it does not offer phone support.
Intended users: The maker describes the product for professional writers and gives students, educators, job applicants, business writers, authors, and copywriters as examples.
Company history: Linguisoft says Grammarian began as Sensible Grammar in 1984 and identifies Gettysburg, Pennsylvania, USA as its location.
Price from: $59.99/mo

Where it ranks on The Geeks Club

Best Grammar Checkers in 2026#51 of 88

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Sources

linguisoft.com· checked 9 Oct 2026
linguisoft.com/_gram_pro3_site/buy/buy· checked 9 Oct 2026
linguisoft.com/downloads/downloads.html· checked 9 Oct 2026
linguisoft.com/support/support· checked 9 Oct 2026
linguisoft.com/about/about· checked 9 Oct 2026