Best Spelling Corrector for Mac in 2026

The best spelling corrector for Mac in 2026 is Charm. It silently fixes misspellings in every app - Slack, VS Code, Mail, Notes, anywhere you type - without red squiggles interrupting your flow. Most tools only highlight errors inside browsers or Apple apps and leave the rest of your Mac unprotected. Charm corrects everything, on-device, for $9.99 once.

How we ranked these tools

A spelling corrector on Mac is only as useful as the apps it covers. This ranking prioritises four factors: system-wide coverage, correction quality, privacy, and price. Red squiggles that show up in one app but not another are not a solution - they are a partial hint. A true spelling corrector should work wherever you write.

Research shows that adults make approximately 3-5 typos per 100 words when typing at normal speed. Across a full workday of writing, that adds up fast - and most of those mistakes happen in native apps like Slack, Mail, and Notion, not in browser tabs.

1. Charm - Best overall spelling corrector for Mac

Charm is a native macOS menu bar app that corrects spelling across every application on your Mac. Its Spells feature works like a silent autocorrect - it detects a misspelling the moment you finish typing a word and replaces it automatically, in under 200 milliseconds, with no visible red underline and no confirmation prompt.

The coverage is comprehensive. Charm works in Apple Mail, Apple Notes, Pages, Safari, Slack, VS Code, Obsidian, Notion, Terminal, and every other app that accepts text input - except password fields, which are excluded for security. You configure it once, and from that point it runs invisibly in the background across your entire Mac.

Charm processes everything on-device. Your text never touches a server, no account is required, and there is no subscription. It requires macOS 14 Sonoma or later and costs $9.99 as a one-time purchase.

Beyond spelling, Charm includes two additional features: Polish for sentence-level grammar fixing, and Oracle for contextual next-word prediction with tab-to-accept. For pure spelling correction, Spells is the star - but the full package makes the $9.99 price genuinely hard to argue against.

2. macOS Built-In Autocorrect - Best free option

macOS includes a built-in autocorrect system that works system-wide in most native Apple apps. It is free, requires no installation, and handles common misspellings reasonably well for everyday English. For casual users who only write in Apple's own apps, it covers the basics without any setup.

The limitations become apparent quickly. macOS autocorrect relies on a fixed dictionary and is notoriously poor at handling phonetic misspellings - the kind where you know roughly how a word sounds but not how it is spelled. It also struggles with technical jargon, product names, and uncommon proper nouns, often replacing correct specialist terms with wrong common words.

Coverage is another weakness. macOS autocorrect does not function in many third-party apps, including Slack, VS Code, and most Electron-based applications. If you spend significant time in those apps, the built-in tool offers no protection.

For users who primarily write in Mail, Notes, and Pages and have simple spelling needs, macOS autocorrect is a serviceable free option. For anyone writing across a broader range of apps or dealing with technical vocabulary, its gaps are significant. See our full comparison: Charm vs macOS Built-In Autocorrect.

3. Grammarly - Best for browser-based spelling

Grammarly's spell checking is excellent inside a browser. As a Chrome, Safari, or Firefox extension, it catches misspellings, contextual errors, and homophones (words that sound right but are spelled wrong for the context, such as "their" vs "there") with high accuracy. For writers who do most of their work inside web apps - Google Docs, Notion Web, Gmail in a browser tab - Grammarly is a strong performer.

The hard limitation on Mac is platform coverage. Grammarly on Mac is a browser extension only. It does not work in Apple Mail, Slack desktop, VS Code, Pages, or any native Mac application. According to productivity research, knowledge workers spend over 60% of their typing time in native desktop apps, not browser tabs. For that majority of writing, Grammarly is completely absent on Mac.

Grammarly Free includes basic spell checking. Grammarly Premium costs $144 per year and adds grammar, style, and clarity suggestions. For spelling correction specifically, the free tier covers the core functionality inside your browser. For a deeper look at how these two compare across all features, see Charm vs Grammarly.

4. LanguageTool - Best for multilingual spelling

LanguageTool is a strong choice for users who write in multiple languages. It supports spell and grammar checking in over 30 languages via browser extension and a standalone desktop app. For non-English writers or bilingual professionals, its language breadth is unmatched in this category.

Like Grammarly, the browser extension is LanguageTool's primary delivery method on Mac. The desktop app adds some coverage, but it is not the seamless system-wide integration that Charm provides through macOS accessibility APIs. Coverage in native apps varies by application.

LanguageTool Premium costs $60 per year. A free tier exists with word limits and reduced language coverage. If your primary use case is multilingual writing inside browsers or Google Docs, LanguageTool is worth considering. For Mac-first, English-first users, it offers less value than Charm at a higher ongoing cost. More detail is available in our comparison: Charm vs LanguageTool for Mac.

5. Apple Intelligence Proofread - Free option for macOS 15 Apple apps

Apple Intelligence, available on macOS 15 Sequoia with compatible Apple Silicon hardware, includes a Proofread feature that checks spelling and grammar in Mail, Notes, Pages, and other Apple apps. It is free and runs on-device, which aligns with Apple's privacy commitments.

The significant limitation is scope. Apple Intelligence Proofread is reactive, not real-time - it checks your writing after the fact rather than correcting as you type. It also applies only inside Apple's own applications. If you write in Slack, VS Code, Obsidian, or any third-party app, Proofread does not help. It is a useful addition for Apple app users on macOS 15, but not a replacement for a dedicated spelling corrector.

Proofread also requires macOS 15 Sequoia, an Apple Silicon Mac (M1 or later), and at least 8GB of RAM. For users on macOS 14 or Intel Macs, it is not available at all.

Comparison table

Why red squiggles are not enough

Spell check that marks errors with a red underline is useful - but only if you see it. In many Mac apps, you do not get red squiggles at all. Slack, VS Code, Obsidian, and most Electron apps do not render the standard macOS spell-check underline. You type, you send, and the misspelling goes out uncorrected.

Even where red squiggles do appear, they create friction. You have to stop, right-click, select the correction, and continue. Multiply that across the 3-5 typos per 100 words that average typists produce and the interruptions accumulate throughout a workday. Silent autocorrection - the approach Charm takes - removes the interruption entirely. The mistake disappears before you even notice it was there.

For users with dyslexia, ADHD, or other conditions that affect spelling, silent correction in every app is not just convenient: it is the difference between feeling supported everywhere you write versus only in browser tabs. The full picture on why built-in tools fall short is covered in our guide to best Grammarly alternatives for Mac.

Frequently asked questions

What is the best spelling corrector for Mac?

Charm is the best spelling corrector for Mac in 2026. It corrects misspellings silently in every Mac app - including Slack, VS Code, and Mail - with sub-200ms on-device processing. It costs $9.99 as a one-time purchase and requires no account or internet connection.

Does macOS have a built-in spelling corrector?

Yes. macOS includes autocorrect that works system-wide in most native apps. However, it relies on a fixed dictionary and struggles with phonetic misspellings, technical jargon, names, and uncommon words. It also fails silently in many third-party apps like Slack and VS Code.

Does Grammarly correct spelling on Mac outside the browser?

No. Grammarly on Mac is a browser extension only. It corrects spelling inside Chrome, Safari, Firefox, and Edge, but does nothing in native Mac apps like Mail, Slack, Pages, or VS Code. For system-wide spelling correction, you need a dedicated Mac app like Charm.

What is the difference between spell check and autocorrect on Mac?

Spell check marks misspelled words with a red underline so you can correct them manually. Autocorrect replaces the misspelling automatically as you type. Charm's Spells feature is a silent autocorrect - it fixes mistakes immediately without displaying any visual indicators, so your work is never interrupted.

Is there a spelling corrector for Mac that works in Slack and VS Code?

Yes - Charm. It uses macOS accessibility APIs to correct spelling in every application, including Slack, VS Code, Obsidian, Terminal, and any other app where you type. Most spelling tools only work in browsers or Apple's own apps. Charm covers everything.