How to Fix Grammar in Any Mac App Without a Browser Extension

Introduction

Grammar checkers have a dirty secret: most of them only work in your browser.

Install Grammarly or LanguageTool and they will catch your mistakes in Google Docs, Gmail, and websites. But open Slack's desktop app, draft an email in Apple Mail, write a comment in Xcode, or type a note in Pages — and those extensions go silent. The little green icon disappears. You are on your own.

This is not a bug. It is a fundamental architectural limitation. Browser extensions live inside the browser. Native Mac applications live outside it. The two worlds do not speak the same language, and no amount of plugin configuration changes that.

This guide explains why that limitation exists, which apps it affects, and how a different approach — using the macOS Accessibility API — makes it possible to fix grammar in any Mac application with a single keyboard shortcut. You can also check out our grammar checker for Mac for a hands-on look at how WordWand handles this.

Why Browser Extensions Cannot Reach Native Apps

A browser extension is a piece of JavaScript that runs inside a browser's rendering process. It can observe and manipulate anything inside that process: web page content, form fields, text inputs, iframes. Chrome, Firefox, Safari — extensions have deep access to these environments because they are part of the same sandboxed runtime.

Outside that runtime, extensions have no reach. A browser extension cannot observe a window that belongs to a different process, let alone read or write text inside it. macOS enforces strict process isolation. Mail.app, Slack's Electron app, Pages, Xcode, VS Code — each runs in its own process, with its own memory space, entirely invisible to browser extensions.

Some grammar tools have tried to bridge this gap by building native apps alongside their browser extensions. But most of these native integrations are narrow: they cover a specific set of popular apps, require per-app configuration, or only work through a dedicated text field in the tool's own interface. The moment you step outside the officially supported app list, the coverage evaporates.

The result is a patchwork of grammar assistance that works sometimes, in some apps, with some caveats — which is a poor foundation for professional communication.

Which Apps Browser Extensions Cannot Reach

The list of native Mac apps that fall outside the reach of browser extensions is long. Here are the ones where the gap is most painful:

Apple Mail. The most-used email client on Mac, and one where grammar matters enormously. Grammarly's browser extension does not work here. Its native Mac app offers some integration, but it is incomplete and requires a separate workflow.

Slack (desktop app). Most teams use Slack for professional communication. The desktop app is built on Electron, but browser extensions do not automatically extend into Electron apps — they require explicit support that Slack has not provided for third-party grammar tools.

Pages and Keynote. Apple's own productivity apps. No extension can touch these.

Xcode. Developers write code comments, documentation, commit messages, and pull request descriptions in Xcode. Grammar still matters in all of these. Extensions have no access.

Notes. Apple's built-in notes app is off-limits to browser extensions.

VS Code. VS Code is Electron-based and does have some extension support, but general grammar browser extensions do not reach it. Grammar checking in VS Code comments or markdown files requires separate, editor-specific plugins.

Any other native or Electron app. CRMs, project management tools, writing apps, terminal emulators, communication tools — if it is not a web page, a browser extension cannot help.

The macOS Accessibility API: A Different Approach

macOS has a system-level API called the Accessibility API (AXaccessibility). It was designed to support assistive technologies — screen readers, voice control, switch access — and it works across every application that uses standard macOS UI components.

An app with Accessibility permission can read the selected text in any other application, send modified text back, and interact with UI elements across the entire system. This is how VoiceOver reads your screen. It is also how WordWand's grammar checker for Mac works.

When you select text in any Mac application and trigger WordWand's keyboard shortcut, the following happens:

1. WordWand reads the selected text through the Accessibility API.
2. It sends the text to its AI engine for grammar correction.
3. It writes the corrected text back into the exact same location via the Accessibility API.
4. The result appears inline, as if you had typed it yourself.

There is no browser extension. There is no copy-paste. There is no separate window to manage. The grammar correction happens in-place, inside whatever application you are already using.

The permission model is transparent: macOS requires you to explicitly grant Accessibility access to WordWand in System Settings > Privacy & Security > Accessibility. This is a one-time step, and you can revoke it at any time.

Fixing Grammar in Specific Apps: Step by Step

Fixing Grammar in Slack

The Slack desktop app is where many people notice the browser extension gap most acutely. You are drafting a message to a client or a senior colleague and you want to be sure it reads well — but Grammarly's extension is nowhere to be found.

With WordWand installed and Accessibility permission granted:

1. Type your Slack message as normal.
2. Select the text you want to check (or press Cmd+A to select all in the message field).
3. Press your WordWand shortcut (default: Cmd+Shift+Space).
4. Choose "Fix Grammar" from the action menu.
5. WordWand replaces the selected text with the corrected version, directly inside Slack's message field.

The entire interaction takes under three seconds and you never leave Slack.

Fixing Grammar in Apple Mail

Drafting a professional email in Mail is one of the most common places people want grammar assistance. The workflow is identical to Slack:

1. Write your email draft as normal.
2. Select the text you want to correct.
3. Trigger the WordWand shortcut.
4. Select "Fix Grammar."
5. The corrected text replaces your selection in the Mail compose window.

If you want to fix the entire email body at once, select all with Cmd+A before triggering the shortcut.

Fixing Grammar in Xcode

Developers often overlook grammar in their own writing — inline code comments, documentation strings, and commit messages all benefit from a quick grammar pass. In Xcode:

1. Select the comment or documentation block.
2. Trigger WordWand.
3. Choose "Fix Grammar."

The corrected text replaces the selection in your Xcode editor. The surrounding code is untouched.

Extension-Based vs. Accessibility-API-Based: Side by Side

Capability	Browser Extension (Grammarly, LanguageTool)	Accessibility API (WordWand)
Works in web browsers	Yes	Yes
Works in Apple Mail	Limited / No	Yes
Works in Slack desktop	No	Yes
Works in Xcode	No	Yes
Works in Pages	No	Yes
Works in VS Code	No	Yes
Works in Notes	No	Yes
Works in any native app	No	Yes
Requires browser	Yes	No
Inline replacement	Yes (in browser)	Yes (everywhere)
Setup complexity	Install extension per browser	One Accessibility permission
AI grammar correction	Yes	Yes
Additional features	Tone, style suggestions	Grammar, tone, translation, dictation, TTS

The practical conclusion is that browser extensions are excellent at what they do — inside the browser. The Accessibility API approach extends that same capability across the entire macOS environment.

Beyond Grammar: The Same Approach for Every Writing Task

Because WordWand uses the Accessibility API for all of its features, the same cross-app reach applies to translation, tone adjustment, summarization, and AI writing. When you want to use an AI writing assistant that works everywhere, you are not limited to whatever the tool's developers have officially integrated.

You also do not need to maintain separate tools for different contexts — one grammar extension for the browser, one app for Slack, a different workflow for Mail. A single keyboard shortcut covers the entire desktop.

For users who want to compare this approach against the leading browser-extension-based grammar tool, see our breakdown of WordWand vs Grammarly.

Privacy and Permissions

Some users wonder about the security implications of granting Accessibility access. Here is what the permission actually does and does not do:

WordWand reads selected text only when you explicitly trigger the keyboard shortcut. It does not monitor your keystrokes in the background, does not capture clipboard contents passively, and does not maintain a log of what you write. The Accessibility permission enables reading selected text on demand — nothing more.

You grant the permission once in System Settings > Privacy & Security > Accessibility. macOS displays WordWand in that list so you can see what has access and revoke it at any time.

Setting Up Grammar Correction Across All Mac Apps

Getting started takes about two minutes:

1. Download WordWand from the Mac App Store or the WordWand website.
2. Open WordWand and follow the onboarding prompt to grant Accessibility access in System Settings.
3. Set your preferred keyboard shortcut (or keep the default).
4. Start using grammar correction in any app.

The free tier includes 5,000 words of grammar correction per month with no credit card required. Every feature — including translation, AI generation, voice dictation, and text-to-speech — is available on the free tier within that limit.

Frequently Asked Questions

Why does Grammarly not work in Slack or Mail on Mac?

Grammarly's browser extension lives inside the browser process and cannot access applications running in separate processes. The Slack desktop app and Apple Mail are native (or Electron-based) applications that run independently from any browser, so browser extensions have no reach into them.

Is it safe to grant Accessibility access to WordWand?

Yes. The macOS Accessibility permission lets WordWand read selected text when you trigger the shortcut. WordWand does not run in the background reading your keystrokes, does not access your clipboard passively, and does not log your writing. You can verify and revoke the permission at any time in System Settings > Privacy & Security > Accessibility.

Does this work in VS Code?

Yes. WordWand can read selected text in VS Code and replace it with corrected text. This works in any file type — markdown, code comments, README files, documentation blocks. The surrounding code is not affected unless you select it.

What is the difference between WordWand and Grammarly's native Mac app?

Grammarly's native Mac app extends its coverage beyond the browser for some applications, but it still does not reach every native app on your Mac and the inline replacement behavior is inconsistent. WordWand's Accessibility API approach covers any app that uses standard macOS text components — which is the vast majority of applications.

Can WordWand fix grammar in languages other than English?

Yes. WordWand supports grammar correction and AI writing in 40+ languages. If you are writing in French, Spanish, German, Portuguese, or another supported language, the same shortcut applies.