The best free writing tools on Mac are the ones already built into macOS, topped up with a couple of well-chosen free tiers. Six of the seven below cost nothing: macOS autocorrect is the strongest built-in baseline, LanguageTool Free is the best free grammar checker for browser writing, and Hemingway is the best free readability pass. The seventh, Charm, is the best paid option at a one-time $9.99, included because every free tool here shares one blind spot it closes: Electron apps such as Slack, VS Code and Discord, where Apple's own spell checker never runs at all.
1. macOS Autocorrect - Best Built-In Baseline
macOS has had autocorrect built in since Snow Leopard. You enable it in System Settings under Keyboard, and it runs silently across every native Mac app with no configuration beyond that. For Mail, Notes, Pages, TextEdit, and iMessage, it catches common spelling errors as you type and substitutes the correct word automatically.
The limitation is scope. macOS autocorrect works by hooking into Apple's NSSpellChecker framework. Any app that bypasses that framework - including every Electron app like Slack, VS Code, and Discord - gets no correction at all. There is also no grammar checking and no word prediction. For native-app writing, it is a useful free baseline. For anything beyond that, it leaves you uncovered.
Best for: Users who write primarily in native Mac apps and want zero-configuration spelling.
Not for: Anyone writing in Slack, VS Code, Discord or another Electron app, where it does not run at all, and anyone who needs grammar help rather than single-word substitution.
2. Apple Intelligence Writing Tools - Best Free Rewrite Feature
Apple Intelligence Writing Tools arrived with macOS 15 Sequoia and are available system-wide via right-click or the editing toolbar in any text field on compatible Apple Silicon Macs. The proofread and rewrite features are genuinely capable - rewrite options range from tone adjustment to concision to making text more professional.
The constraints are significant. Apple Intelligence requires macOS 15 Sequoia and an Apple Silicon chip (M1 or later). The proofread feature is triggered manually, not in real time - you finish writing, then invoke it. Real-time correction as you type is not part of what Writing Tools offer. And the rewrite function modifies entire passages rather than catching individual errors inline. For users on macOS 14 or Intel Macs, this option is not available at all.
Best for: macOS 15 Apple Silicon users who want to polish finished passages.
Not for: Intel Mac owners and anyone below macOS 15, who cannot run it at all, and anyone who wants correction while typing rather than a rewrite they invoke on a selection.
The hardware floor is worth checking before you count on it. Apple's own How to get Apple Intelligence page gives the requirement as "Mac computers with Apple silicon" on macOS Sequoia 15.1 or later, plus 7 GB of on-device storage for the models (checked 27 August 2026). No Intel Mac qualifies, whatever version of macOS it runs.
3. LanguageTool Free - Best Free Browser Grammar Checker
LanguageTool's free browser extension offers grammar and style checking in Chrome, Firefox, Safari, and Edge. It covers over 30 languages, which makes it the strongest free option for multilingual writers. The free tier checks up to 3,000 characters per text block - enough for a standard email or short document, but limiting for longer pieces.
LanguageTool Free catches a meaningful range of grammar errors: subject-verb disagreement, comma splices, confused homophones, and redundant phrases. The suggestions appear inline as underlines, similar to Grammarly. The character limit is the main friction point for long-form writing; you either paste in sections or upgrade to Premium at around $60 per year.
Best for: Browser-based writing, especially in multiple languages.
Not for: Long documents, since a free check is capped at 3,000 characters per pass, and native Mac apps, which the browser extension cannot reach.
4. Grammarly Free - Best Known Free Grammar Tool
Grammarly Free is the most widely recognised writing tool on this list. Its browser extension works in Chrome, Safari, Firefox, and Edge, catching spelling and basic grammar errors inline. The interface is polished, suggestions are clear, and the acceptance rate for its corrections is high - Grammarly's underlying grammar model is well-trained on standard English.
The honest limitation: Grammarly Free sends all your text to Grammarly's servers for processing. This is not a hidden detail - it is in their privacy policy - but it is worth knowing if you work with sensitive documents. The free tier also does not reach any native Mac app. Mail, Pages, Slack desktop, VS Code, and every other non-browser app are outside its reach entirely. Advanced suggestions like tone detection and style coaching are locked behind Grammarly Premium at $144 per year.
Best for: Users who write primarily in browser-based tools and want a polished free grammar checker.
Not for: Confidential writing, since free checks are processed in the cloud, and any work outside the browser in native Mac apps.
5. Hemingway App (Web) - Best Free Readability Tool
The Hemingway web app at hemingwayapp.com is free to use in the browser. Paste in your writing and it highlights sentences that are hard to read, flags passive voice, marks adverbs, and calculates a readability grade level. It is the most useful free tool for improving clarity and concision in finished drafts.
Hemingway is a post-edit tool, not a real-time writing assistant. It does not monitor your typing anywhere - you write in your regular app, then bring the text to Hemingway for review. The web version saves nothing and processes everything in the browser, making it private. The desktop app costs $19.99 as a one-time purchase and adds offline access. For occasional readability review on blog posts, reports, or long emails, the free web version is sufficient.
Best for: Reviewing finished drafts for clarity and readability.
Not for: Real-time correction. It changes nothing as you type and needs you to paste finished text into a web page.
6. macOS Text Replacements - Best Free Phrase Expander
Text Replacements in System Settings under Keyboard let you define short trigger strings that expand into longer phrases. Type ;;sig and it becomes your full email signature. Type ;;addr and it expands to your mailing address. This is free, syncs across Apple devices via iCloud, and works in every native Mac app.
The same Electron limitation applies here as with macOS autocorrect: Text Replacements use NSSpellChecker and will not fire in Slack desktop, VS Code, Discord, or other Electron-based apps. This is a significant gap for anyone who types repetitive phrases in Slack or a code editor. For native-app workflows, though, a set of 10-15 well-chosen Text Replacements is one of the highest-return free productivity tools available on Mac.
Best for: Expanding abbreviations and repetitive phrases in native Mac apps.
Not for: Catching typos you did not anticipate, since it only fires on exact abbreviations you defined yourself, and Electron apps like Slack and VS Code.
7. Charm - Best Paid Option for Covering Every App ($9.99 Once)
Charm is the one paid tool on this list. There is no free tier and no trial: it is $9.99 as a one-time purchase, backed by a 14-day money-back guarantee. It earns a place here because it closes the one gap every free tool above shares: Electron apps. Slack, VS Code, Discord, Notion desktop, and dozens of other apps bypass Apple's NSSpellChecker entirely, which means macOS autocorrect, Text Replacements, and Apple Intelligence Writing Tools all go silent the moment you open them.
Charm uses macOS accessibility APIs to reach text fields at the OS level rather than through NSSpellChecker. This means it covers every app - native and Electron alike. Its three features are Spells (real-time spelling, cyan glow), Polish (grammar correction at sentence boundaries, blue glow), and Oracle (word prediction, Tab to accept, purple glow). Everything runs on-device: your text never leaves your Mac. At $9.99 once, it fits alongside the free tools on this list as the layer that covers the gaps they all share.
Best for: Anyone who writes in Slack, VS Code, Discord, or any Electron app and wants real-time correction there.
Not for: Anyone who needs a genuinely free tool, or anyone on macOS 13 Ventura or earlier. Charm has no free tier and requires macOS 14 Sonoma or later.
Frequently asked questions
Is there a free autocorrect for Mac?
Yes. macOS includes built-in autocorrect at no cost, enabled in System Settings under Keyboard. It works in native Mac apps like Mail, Notes, and Pages. It does not reach Electron apps like Slack and VS Code, and it has no grammar correction. Charm fills those gaps for $9.99 once.
What free grammar checker works on Mac?
LanguageTool Free and Grammarly Free both offer grammar checking via browser extension at no cost. LanguageTool limits checks to 3,000 characters per pass; Grammarly Free covers basic grammar and spelling in Chrome and Safari. Neither works in native Mac apps. For system-wide grammar correction, Charm's Polish feature is the only real-time option.
Does Grammarly free work on Mac?
Grammarly Free works in Chrome, Safari, Firefox, and Edge on Mac via the browser extension. It does not work in Mail, Pages, Slack desktop, VS Code, Discord, or any native Mac app. The free tier covers basic spelling and grammar but not advanced style suggestions, which require Grammarly Premium at $144 per year.
What is the best free writing tool for Mac?
For always-on system-wide coverage, macOS built-in autocorrect is the best free baseline. For browser-based grammar checking, LanguageTool Free is stronger than Grammarly Free due to higher character limits and better multilingual support. For readability review on finished drafts, the Hemingway web app is the best free option.
Do free writing tools send your writing to the cloud?
It depends on the tool. macOS autocorrect, Apple Intelligence Writing Tools, and macOS Text Replacements are all on-device and private. Grammarly Free and LanguageTool Free send text to their servers for processing. Charm processes everything on-device by default - your text never leaves your Mac.