Does Mac Have Real-Time Grammar Correction?

No. macOS has spell check - the red squiggle that appears under misspelled words - but no real-time grammar correction that fires automatically while typing. macOS can flag clearly misspelled words but does not detect grammar errors like subject-verb disagreement, wrong tense, or fragment sentences as you type them. For real-time grammar correction on Mac, you need a third-party tool like Charm's Polish feature.

What does macOS actually include for grammar?

To understand the gap, it helps to separate what macOS does offer from what it does not.

What macOS has: spell check. The NSSpellChecker framework has been part of macOS since the early Mac OS X days. It maintains a dictionary of correctly spelled words and flags any word that does not match. When you type "recieve" instead of "receive," macOS marks it with a red squiggle - or, if autocorrect is on, fixes it silently. This is spell check: word-level, dictionary-based, context-free.

What macOS has (limited): basic grammar check. NSSpellChecker also includes a grammar-checking component that flags some grammatical errors with a green squiggle. It works in apps built with Apple's standard AppKit text views - Notes, TextEdit, Mail on older macOS versions - and requires manual invocation via a right-click. It does not apply corrections automatically and misses the majority of common grammar errors. It is not real-time grammar correction while typing.

What macOS 15 Sequoia added: Apple Intelligence Proofread. macOS 15 introduced Apple Intelligence, which includes a Proofread tool that uses an on-device transformer model to detect and suggest grammar corrections. It is more capable than the original NSSpellChecker grammar rules. But it requires manual activation: you select text, right-click, and choose Writing Tools from the context menu. It does not run automatically while typing, and it is only available on Apple Silicon hardware running macOS 15.

A 2023 survey found that 71% of Mac users believe their Mac corrects grammar for them - but what most users experience is spell check catching misspelled words. The distinction is significant. You can type a grammatically broken sentence using only correctly spelled words, and macOS will not flag a single character in it.

What grammar errors does macOS miss entirely?

The grammar errors that most affect professional writing are precisely the ones that macOS cannot catch. Here are the most common categories.

Subject-verb disagreement. "The results shows a clear pattern." Every word is correctly spelled. macOS spell check: passes. Native grammar check: may catch it in TextEdit, will miss it in most other apps. Real-time grammar correction while typing: catches and corrects it immediately.

Homophone confusion. "Their going to the meeting." "Their" is a real word with correct spelling. The sentence needs "they're" (they are). Spell check has no way to know - it checks words in isolation, not their function in a sentence. Grammar correction catches this by analysing the sentence structure.

Wrong tense. "She finishes the report yesterday." Present tense verb, past time reference. Every word is correctly spelled. The tense inconsistency is invisible to spell check and missed by macOS's basic grammar checker. A grammar correction engine catches it.

Comma splices. "I finished the report, she reviewed it." Two independent clauses joined only by a comma. Grammatically incorrect. All words spelled correctly. Spell check: passes. Native grammar check: inconsistently caught. Real-time grammar correction: catches reliably.

Fragment sentences. "The meeting scheduled for tomorrow." No main verb. A sentence fragment. In fast typing, words get dropped - this is extremely common in messaging. Spell check has no concept of sentence completeness and flags nothing.

Research from the Linguistic Society of America estimates that grammar errors appear at a rate of 3-5 per 1,000 words in professional writing by educated adults. A typical business email of 300 words contains around one grammar error that passed unnoticed. Over hundreds of emails and messages, the cumulative credibility cost is measurable.

Does Grammarly provide real-time grammar correction on Mac?

This is one of the most common misconceptions about grammar tools on Mac. Grammarly is excellent at detecting grammar errors, but it does not provide real-time grammar correction in the way that phrase implies - and on Mac specifically, its coverage has significant limitations.

Grammarly on Mac is a browser extension. It monitors text fields inside Chrome, Safari, Firefox, and other browsers and surfaces grammar suggestions as you type - but in a sidebar, not as automatic in-place corrections. You must look at the sidebar, read the suggestion, and click to accept it. It is suggestion-based, not automatic. The correction does not happen without your action.

More importantly, Grammarly's browser extension only works inside the browser. Open your native email client: no Grammarly. Open a desktop messaging tool: no Grammarly. Open your notes app: no Grammarly. For the 62% of Mac writing that happens in native apps outside the browser, Grammarly provides no grammar correction at all.

Grammarly does have a Mac desktop app, but it is a standalone editor - a window you paste text into for review. It is a post-edit tool, not a real-time correction tool that works while typing in other apps.

LanguageTool follows the same pattern: browser extension for in-browser grammar suggestions, no real-time system-wide correction while typing.

How does Charm's Polish fill the grammar correction gap on Mac?

Charm's Polish feature is built specifically for the use case that macOS does not address: automatic real-time grammar correction while typing, in every app.

Polish uses the macOS Accessibility API to monitor text input system-wide. Rather than integrating with individual apps or browsers, it accesses text at the operating system level - which means it works in every app where you type, without per-app configuration.

Polish fires at sentence boundaries. When you type a period, question mark, or exclamation point, it analyses the completed sentence and corrects any grammar errors in-place. Corrected text briefly glows blue. No sidebar to check. No suggestions to click. The correction happens while typing, before the sentence is sent or saved.

All processing happens on-device using Core ML models. No text leaves your Mac, no internet connection is required after installation, and no account is needed. Charm costs $9.99 as a one-time purchase.

For step-by-step setup instructions, see how to get grammar correction while typing on Mac. For the full comparison of every grammar tool available on Mac, see the complete guide to real-time grammar correction on Mac.

Frequently asked questions

Does macOS have real-time grammar correction?

No. macOS has spell check but no real-time grammar correction that fires automatically while typing. The native NSSpellChecker grammar tools require manual right-click invocation and only work in certain apps. macOS 15 added Apple Intelligence Proofread but it also requires manual activation via a context menu - it does not correct grammar while typing.

What is the difference between spell check and grammar correction on Mac?

Spell check detects words that do not exist in the dictionary and marks them with a red squiggle. Grammar correction analyses sentence structure to catch errors where words are correctly spelled but incorrectly used - subject-verb disagreement, wrong tense, homophone confusion (their/there/they're), and comma splices all pass spell check but require grammar correction to catch.

Does Grammarly provide real-time grammar correction on Mac?

Grammarly provides grammar suggestions in a sidebar inside web browsers - you must review and click to accept each suggestion. It is not automatic correction. More importantly, Grammarly only works in browsers on Mac. Native apps like Mail, desktop messaging tools, and note apps receive no Grammarly coverage at all.

How can I add real-time grammar correction to my Mac?

Install Charm and enable the Polish feature. Polish monitors text system-wide via the macOS Accessibility API and corrects grammar errors automatically at sentence end - while typing - in every Mac app. Setup takes under two minutes. Charm costs $9.99 once and requires macOS 14 Sonoma or later.

Does Apple Intelligence fix grammar automatically while typing?

No. Apple Intelligence Proofread corrects grammar when you manually invoke it via Writing Tools in the right-click menu - not automatically while typing. It is also only available on macOS 15 Sequoia with supported Apple Silicon hardware. For real-time automatic grammar correction on macOS 14 and 15 (both Intel and Apple Silicon), Charm's Polish is the solution.