Which autocorrect is best for your Mac depends on where you write. Charm is the top pick for correcting spelling, grammar and next-word prediction across every Mac application at once, processing everything on-device with no data sent to a server, for a one-time $9.99. The autocorrect already built into macOS is the best free option for simple typo substitution, and Grammarly is the stronger choice if you write almost entirely in a browser and want style coaching rather than correction.
Mac users have more options than ever for writing assistance - from Apple's built-in tools to cloud-based editors. But most have serious gaps: they cover only a slice of your apps, require ongoing subscriptions, or send your text to remote servers. This guide ranks every major option so you can choose the right tool for how you actually write.
1. Charm - Best for System-Wide Correction in Every App
Charm is a native macOS menu bar app that sits invisibly in the background and corrects your writing everywhere on your Mac. It requires macOS 14 Sonoma or later and costs $9.99 as a one-time purchase - no subscription, no renewal, no account required.
Charm operates through three distinct features. Spells handles real-time spelling correction, catching typos and fixing them with a subtle cyan glow overlay in under 200ms. Polish tackles sentence-level grammar - fragmented sentences, subject-verb disagreement, incorrect tense - signalled by a blue glow. Oracle predicts the next word based on context and lets you accept the suggestion with a single Tab press, shown in purple.
What sets Charm apart from every other option in this list is genuine system-wide coverage. It works in Mail, Slack, Notes, Pages, VS Code, Notion, Obsidian, Terminal, web browsers, PDF forms, and every other text field on your Mac. The only exception is password fields, which macOS locks by design to all accessibility tools - not specific to Charm.
Privacy is a genuine differentiator. All processing happens on-device using Apple's native text frameworks. Your keystrokes never leave your Mac. There is no server to breach, no account to compromise, and no data retention policy to read. For professionals handling confidential material - legal, medical, financial, or journalistic - this is a significant practical advantage over cloud-based tools.
Corrections happen silently. There are no red underlines, no modal popups, no interruptions. Charm fixes errors as you type, letting you stay in flow. Studies on writing productivity suggest that interruptions from error notifications can increase overall composition time by up to 20% - silent correction removes that friction entirely.
Best for: Mac users who want comprehensive writing assistance in every app they use, especially those who value privacy or who write across many different applications throughout the day.
Not for: Anyone on an Intel Mac running an older macOS, and people who want a free tool. Charm is a paid app and does not offer a free tier.
Price: $9.99 one-time. Requires macOS 14 Sonoma or later.
2. macOS Built-In Autocorrect - Best Free Option
Every Mac ships with autocorrect built in, configured through System Settings under Keyboard. It works system-wide and requires no installation or payment. For users with modest needs - catching common typos in casual writing - it provides a useful baseline.
The built-in system works on word substitution: it maintains a dictionary of common misspellings and replaces them as you type. This approach works reasonably well for everyday English words but falls apart quickly in practice. Technical terminology, proper nouns, names, and domain-specific vocabulary are all candidates for unwanted "correction." Developers writing in code editors, writers using specialised terminology, and anyone with an unusual name has likely experienced macOS confidently replacing a correct word with a wrong one.
There is no grammar correction in the built-in system. Sentence structure, punctuation errors, and subject-verb disagreement all pass through unchecked. Word prediction exists in a limited form on newer macOS versions but is far less contextually aware than dedicated tools. The built-in autocorrect also has no way to learn from corrections across apps - it treats each session identically.
Best for: Users who want zero cost and basic spelling substitution, and who don't write in technical or specialised domains.
Not for: Anyone who writes technical terms, proper nouns or names regularly, since those are exactly what it mis-corrects, and anyone wanting grammar help or prediction.
Price: Free. Included with macOS.
3. Apple Intelligence Writing Tools - Best for Apple App Users
Apple Intelligence Writing Tools, introduced with macOS 15 Sequoia, add AI-powered rewrite, proofread, and summarise capabilities to Apple's built-in apps. They are free for users on M1 or later hardware running macOS 15, with no additional payment required.
The critical limitation is app coverage. Apple Intelligence Writing Tools work only inside Apple's own applications: Mail, Notes, Pages, Keynote, and a small number of other first-party apps. They do not function in Slack, VS Code, Notion, Obsidian, Google Docs (desktop), or any other third-party application. For most Mac users whose daily writing happens across a mix of Apple and third-party apps, this restriction excludes a large portion of their actual workflow.
Apple Intelligence also requires manual invocation. You select text, right-click, and choose a Writing Tools action. There is no real-time correction as you type - you proofread after the fact rather than as you write. This is a fundamentally different model to tools like Charm that operate continuously and invisibly in the background.
The quality of suggestions within supported apps is good. Apple's on-device processing is genuinely private - like Charm, your text does not leave your device. But the combination of limited app support and manual workflow makes it a complement to other tools rather than a primary autocorrect solution for most users. For a detailed comparison, see Charm vs Apple Intelligence Writing Tools.
Best for: Users who work primarily in Apple's own apps and want occasional manual proofreading assistance, especially on M-series Macs.
Not for: Intel Mac owners, who are excluded outright, and anyone who wants correction to happen as they type rather than a rewrite they select text and invoke.
Price: Free. Requires macOS 15 on M1 or later hardware.
Apple is explicit about the hardware floor. Its own How to get Apple Intelligence page lists the requirement as "Mac computers with Apple silicon", running macOS Sequoia 15.1 or later, with 7 GB of on-device storage for the models (checked 27 August 2026). Every Intel Mac is therefore ruled out, whatever version of macOS it is running.
4. Grammarly - Best for Browser-Only Writers
Grammarly is the most widely recognised writing assistant tool, used by over 30 million people worldwide according to the company's own figures. On Mac, it is available as a browser extension for Chrome, Safari, Firefox, and Edge, plus a limited desktop app for composing in a dedicated Grammarly editor.
The browser extension delivers Grammarly's full feature set - spelling, grammar, style suggestions, clarity scores, tone detection, and plagiarism checking in Premium - inside any web page with a text input. For writers who work primarily in browser-based tools like Gmail, Google Docs (web), LinkedIn, or WordPress, Grammarly's browser extension is genuinely excellent.
Outside the browser, Grammarly provides no system-wide coverage on Mac. Native apps including Mail, Slack desktop, VS Code, Notes, Pages, and any other non-browser application receive no assistance. This is a fundamental architectural limitation, not a missing feature - Grammarly works as a browser extension, and browser extensions cannot access content outside the browser.
Grammarly Premium costs $144 per year. The free tier is usable but restricts most grammar and style features. Over three years, Grammarly Premium costs $432 - compared to a single $9.99 payment for Charm. For a full comparison, see Charm vs Grammarly.
Privacy is a consideration. Grammarly transmits the text you type (in covered fields) to its servers for processing. Its privacy policy permits using anonymised, aggregated text data for product improvement. For users writing confidential content, this is worth factoring in.
Best for: Writers who spend the majority of their time in browser-based tools and want detailed style coaching beyond basic correctness.
Not for: Native Mac apps. Outside the browser its coverage thins considerably, and it is a subscription rather than a one-time cost.
Price: Free tier available. Premium is $144/year.
5. LanguageTool - Best Open-Source Option
LanguageTool is an open-source grammar and spell checker with strong multilingual support - covering over 30 languages - making it notable among English-centric alternatives. It is available as a browser extension, a desktop app, and via API, with both free and Premium tiers.
On Mac, LanguageTool primarily functions as a browser extension, similar to Grammarly. Its desktop app provides a standalone editor interface rather than system-wide integration, so coverage outside the browser remains limited for most workflows. For native Mac apps, LanguageTool offers no real-time correction.
LanguageTool Premium costs approximately $60 per year - cheaper than Grammarly but still a recurring subscription. Its open-source core means the free tier is more capable than Grammarly's, and self-hosting is possible for technically inclined users who want on-device processing without paying for Charm. The self-hosted route requires meaningful technical setup and maintenance, making it impractical for most users.
For English-only Mac users, LanguageTool's main advantage over Grammarly is price. For multilingual writers, its language depth is a genuine differentiator. See Charm vs LanguageTool for Mac for the full breakdown, or Best LanguageTool Alternatives for Mac if you are already using it and looking for something better.
Best for: Multilingual writers who want a lower-cost subscription alternative to Grammarly, or developers willing to self-host for on-device processing.
Not for: Anyone who wants correction without a subscription or a server round trip, unless you are willing to run and maintain the self-hosted server yourself.
Price: Free tier available. Premium is approximately $60/year.
On privacy LanguageTool draws a narrow line, and it is worth reading closely: its own site states that "To respect your privacy, no text is stored by the browser add-on." That is a promise about storage, not about transmission. Text is still sent to its servers to be checked unless you run the open-source server yourself.
How do all the options compare?
| Feature | Charm | macOS Built-In | Apple Intelligence | Grammarly | LanguageTool |
|---|---|---|---|---|---|
| System-wide coverage | Yes | Yes | Apple apps only | Browser only | Browser only |
| Real-time correction | Yes | Yes | No - manual | Yes (browser) | Yes (browser) |
| Grammar fixing | Yes | No | Yes (Apple apps) | Yes (browser) | Yes (browser) |
| Word prediction | Yes | Limited | No | No | No |
| On-device processing | Yes | Yes | Yes | No - cloud | No (unless self-hosted) |
| Price | $9.99 once | Free | Free (M1+, macOS 15) | $144/year | ~$60/year |
| macOS version required | macOS 14+ | Any | macOS 15 + M1+ | Any (browser) | Any (browser) |
Frequently asked questions
What is the best autocorrect app for Mac in 2026?
It depends where you write. Charm is the strongest pick if you want spelling, grammar and next-word prediction working in every Mac app at once, on-device, for a one-time $9.99 with no subscription. If you only need simple typo substitution, the autocorrect built into macOS is free and already installed. If you write almost entirely in a browser and want style coaching, Grammarly covers that better.
Does macOS have built-in autocorrect?
Yes. macOS includes built-in autocorrect that substitutes common misspellings system-wide. It is free but limited to simple word substitutions. It frequently mis-corrects technical terms and proper nouns, and offers no grammar correction or meaningful word prediction.
Does Apple Intelligence work as autocorrect in every Mac app?
No. Apple Intelligence Writing Tools work only inside Apple's own apps such as Mail, Notes, and Pages. They do not function in third-party apps like Slack, VS Code, or Notion, and they require manual invocation rather than correcting text automatically as you type.
Is there a privacy-safe autocorrect for Mac?
Yes. Charm performs all corrections entirely on-device. Your text never leaves your Mac - no server, no account, no data retention. Tools like Grammarly send your text to the cloud for processing, which is a concern for anyone handling sensitive or confidential material.
What is the cheapest autocorrect app for Mac?
macOS built-in autocorrect is free. For a paid option with full grammar and prediction features, Charm is the most affordable at $9.99 one-time. Grammarly costs $144 per year and LanguageTool Premium costs around $60 per year - both require ongoing subscriptions.