Best 5 AI Grammar Checkers in 2026: See What Stands Out

Introduction

Grammarly is the best all-around AI grammar checker in this group, with grammar and spelling checks, rewriting suggestions, and tone guidance. This roundup compares five tools by what they do well, where you can use them, and who they suit best. That should make it easier to choose based on where you write and what kind of help you need.

Quick comparison

Pricing details aren’t listed here, so check each provider’s current plans before choosing. Use the table as a starting point, then read the reviews to see which tool fits your needs.

1. Grammarly

Best for: All-around writing assistance across devices.

Grammarly checks grammar and spelling, suggests rewrites, and gives tone feedback to help you shape a message. That tone guidance sets it apart from tools that focus mainly on catching errors. You can use Grammarly on the web, in browser extensions and desktop apps, or on iOS and Android. Plans are available for individuals and organizations.

2. Microsoft Editor

Best for: People who write in Microsoft Word and Outlook.

Microsoft Editor checks grammar and spelling and suggests style edits. Its biggest advantage is how well it fits with Microsoft’s writing tools. It’s available in Word for the web and through Edge and Chrome extensions. If you already draft and edit in Word or Outlook, Editor is a practical choice that doesn’t require you to open a separate writing platform.

3. LanguageTool

Best for: Writers who want checks across multiple apps.

LanguageTool checks grammar, spelling, and style on the web, in browser extensions, and in desktop apps. Its desktop support is a useful plus: the app can offer suggestions in Apple Mail, Notes, and Messages. Consider it if you write outside a browser or document editor and want feedback in several everyday apps.

4. Wordtune

Best for: Writers who regularly revise phrasing.

Wordtune pairs grammar checks with AI rewriting suggestions, so it’s especially useful when you want to revise phrasing. You can use it on the web or with its browser extension. Its plans include rewriting and other writing assistance features, which may suit writers looking for more than error correction. Check the current plan details to see what’s included.

5. Hemingway Editor

Best for: Writers focused on concise, clear text.

Hemingway Editor helps make writing clearer and more concise. Alongside its clarity-focused editor, it offers an advanced grammar checker and AI writing tools. It’s available on the web and desktop. Choose it if trimming dense sentences and improving clarity matter as much as catching grammar issues.

How we picked these tools

We focused on tools that clearly offer grammar or spelling checks alongside AI writing assistance. We also considered where you can use them, from browser extensions to desktop and mobile apps, and the features that matter in everyday writing: tone guidance, Microsoft integration, support across apps, rewriting, and clarity. These tools address different needs. The goal is to show what each one is suited for, not to suggest that one option works for every writer.

Frequently asked questions

What can an AI grammar checker do?

An AI grammar checker can do more than flag spelling mistakes. Depending on the tool, it may spot grammar issues, suggest style changes, offer rewrites, or give tone guidance.

How do grammar checks differ from rewrites?

Grammar checks flag errors or areas you might improve. Rewriting suggestions give you alternative wording, while style tools may focus on clarity, tone, or concision. Some platforms offer all of these; others focus on just one or two.

Should I choose a browser extension or desktop app?

Choose based on where you do most of your writing. A browser extension can help across web apps, while a desktop app may work in installed programs. If you mainly use Word, a tool that fits with Microsoft’s writing tools may be more convenient. A clarity-focused editor can also help with grammar if it includes a grammar checker. Check each provider’s current plan details before deciding.

The verdict

Grammarly is the strongest all-around pick, with grammar and spelling checks, rewrites, tone guidance, and broad platform support. Microsoft Editor is a good runner-up if you already write in Word or Outlook. LanguageTool suits writers who want desktop suggestions in apps such as Mail, Notes, and Messages. Pick the tool that fits where you write and what you want to improve.