Best 6 Email Grammar Checkers in 2026: Find Your Best Fit

Introduction

Grammarly is the best overall email grammar checker for people who want suggestions across email services, devices, and desktop apps. This roundup compares six tools that check email grammar, spelling, and style. The best choice depends on where you write, whether that’s Gmail, Outlook, Apple Mail, or another service, and where you want suggestions to show up.

Quick comparison

Email support varies by tool. Grammarly, Microsoft Editor, and Ginger cover Gmail and Outlook in supported environments, while Sapling focuses on Outlook. LanguageTool also supports Apple Mail and Thunderbird, and ProWritingAid’s extension focuses on Gmail. Plans and features can change, so check each provider’s current details before choosing.

1. Grammarly

Best for: Checking email across multiple services and devices.

The Grammarly browser extension and apps check grammar and spelling in email services such as Gmail and Outlook. Grammarly also offers writing suggestions across web and desktop applications, so you can get feedback outside the email compose window, too.

Its biggest advantage is how many places it works. Use Grammarly on the web, through browser extensions, in desktop apps, or on iOS and Android. It’s a practical choice if you switch between email services or devices.

2. Microsoft Editor

Best for: People who write email in Outlook or use a browser extension with Gmail.

Microsoft Editor checks spelling and grammar as you compose in Outlook. Its browser extension also works with Gmail, which is handy if Outlook isn’t your only inbox. Microsoft 365 adds more advanced grammar and style suggestions beyond basic corrections.

That combination sets Editor apart: you can get email checks in Outlook and Gmail, with more detailed feedback available through Microsoft 365. It’s a natural fit for people who already use Microsoft software, especially if Outlook is their main email service.

3. Ginger

Best for: People who want corrections in a browser or desktop app.

Ginger checks grammar, spelling, and style. Its browser extensions work on sites including Gmail, and its desktop app provides writing corrections in email and other applications.

You can choose between the browser extension and desktop app based on where you write. Use the extension for a web-based inbox, or the desktop app for corrections across email and other software. Ginger’s mobile apps are another option if you write on iOS or Android.

4. Sapling

Best for: People composing messages in Outlook.

Sapling provides spelling and grammar suggestions as you write messages in Outlook. It supports Outlook add-ins and browser-based Outlook through its extension, giving you two ways to add corrections to your email workflow.

That Outlook integration is Sapling’s main draw. The add-in may suit people who use Outlook’s app, while the browser extension works for Outlook on the web. Sapling is more focused on Outlook than tools that cover a wider range of email services.

5. LanguageTool

Best for: People who write email in several services, including Apple Mail or Thunderbird.

LanguageTool checks grammar, spelling, and word choice in email services such as Gmail, Apple Mail, and Thunderbird. It offers browser extensions and desktop apps, so the best option depends on where you compose your messages.

Support for Apple Mail and Thunderbird makes LanguageTool stand out in this group. If you don’t use Gmail or Outlook, check that your preferred service and device work with the specific LanguageTool extension or app you plan to use.

6. ProWritingAid

Best for: People who want grammar and style checks while writing in Gmail.

The ProWritingAid browser extension checks grammar, spelling, and style in Gmail. It also works with other writing applications, which can help if you draft text outside your inbox before sending it.

The Gmail-focused extension is ProWritingAid’s main email feature. It combines basic corrections with style suggestions as you compose, though it supports fewer email services than tools with broader coverage.

How we picked these tools

We focused on software that checks email as you compose, rather than tools that only review text you paste in. The comparison looks at which services and writing environments each tool supports, including Gmail, Outlook, Apple Mail, and Thunderbird where applicable.

We also considered the feedback each tool provides: grammar, spelling, style, and word choice. The list includes browser extensions, desktop and mobile apps, and Outlook integrations where the supplied product details support them. Compatibility can depend on the app, browser, and version.

Frequently asked questions

Can a browser extension check email as I write?

Yes. Several tools in this list offer browser extensions that provide suggestions as you compose in supported email services, including Gmail and browser-based Outlook. The services each tool supports vary.

Which email services do these tools support?

Several tools support Gmail and Outlook, but not all of them work with both in the same way. LanguageTool also supports Apple Mail and Thunderbird. Sapling focuses on Outlook, while ProWritingAid’s extension focuses on Gmail.

What’s the difference between grammar and style checks?

Grammar and spelling checks catch errors such as agreement problems and misspelled words. Style suggestions go a step further, flagging wording that may be unclear or awkward. Choose based on the feedback you need and where you write email.

The verdict

Grammarly is the strongest overall pick for its coverage across Gmail, Outlook, web and desktop applications, and multiple devices. Microsoft Editor is a good runner-up for Outlook users and anyone who wants a browser extension for Gmail. LanguageTool is worth considering if you write email in services such as Apple Mail or Thunderbird.