Grammarly is a writing assistant that reviews text as you type it and flags grammar mistakes, awkward phrasing, and tone issues before you hit send. It works inside a browser extension, desktop app, mobile keyboard, and plugins for tools like Google Docs and Microsoft Word, so the same checking follows you across email, documents, and social posts rather than living in one app.
What does Grammarly do?
At its core, Grammarly proofreads: it catches spelling and grammar errors, flags passive voice or wordy sentences, and suggests clearer phrasing. It also reads the tone of what you have written, so you can tell whether an email reads as confident, apologetic, or blunt before you send it, and adjust before it lands wrong with the reader.
On paid plans, Grammarly goes further with full sentence rewrites, tone adjustment on demand, brand style guide enforcement for teams, an AI detector, a plagiarism checker, and a set of AI agents including a Humanizer that adds personality back into AI-drafted text and a Reader Reactions tool that estimates how an audience will respond to a piece of writing.
Core features
- Real-time grammar, spelling, and punctuation checking across browsers, desktop apps, and mobile.
- Tone detection that shows how a piece of writing is likely to come across before you send it.
- Full-sentence rewrites and tone adjustment on the paid Pro and Enterprise plans.
- A plagiarism checker and an AI detector for reviewing whether text may be AI-generated.
- An AI Humanizer agent that revises AI-drafted text to sound more natural.
- Team features including a shared style guide, brand tones, and snippets for consistent messaging.
- AI prompt-based text generation, with a monthly prompt limit that scales by plan.
- Browser extensions and integrations for Gmail, Google Docs, Slack, Microsoft Office, and more.
Use cases
Grammarly is common for anyone who writes for work or school and wants a second pair of eyes on every email, report, or essay. Businesses use the team-level features to keep writing consistent with a brand style guide across support, marketing, and sales teams, while individuals use it to write with more confidence in a second language or a formal setting.
- Proofreading emails, reports, and presentations before they go out.
- Keeping customer support and marketing writing consistent with a company style guide.
- Checking student essays for grammar issues and accidental plagiarism.
- Reviewing AI-drafted content for tone and making it read more like a person wrote it.
Pricing
Grammarly's Free plan costs $0 a month and covers basic grammar and spelling checks, tone detection, and 100 AI prompts a month. The Pro plan costs $12 a month per member when billed annually, or $30 a month billed monthly, and adds full-sentence rewrites, tone adjustment, plagiarism and AI-text detection, and 2,000 AI prompts a month. Enterprise pricing is custom and available through Grammarly's sales team, and includes unlimited members, unlimited AI prompts, dedicated support, and stronger security controls like data loss prevention.
How to use Grammarly
- Go to grammarly.com and create a free account, or sign up with Google.
- Install the browser extension, desktop app, or mobile keyboard so it works wherever you write.
- Write normally in email, a document, or a social post, and review the suggestions as they appear.
- Check the tone indicator before sending anything important to make sure it reads the way you intend.
- Upgrade to Pro if you want full-sentence rewrites, plagiarism checking, or a higher AI prompt limit.
- For teams, set up a shared style guide and brand tones so writing stays consistent across the company.
Frequently asked questions
Is Grammarly free to use?
Yes. The Free plan covers core grammar and spelling checks, tone detection, and a limited number of AI prompts each month. The Pro and Enterprise plans add rewriting, plagiarism checking, and higher usage limits.
Does Grammarly work outside of Google Docs and Microsoft Word?
Yes. Grammarly works through a browser extension that covers most web-based writing, plus desktop apps, a mobile keyboard, and specific integrations for tools like Slack and Microsoft Office.
Can Grammarly detect AI-generated text?
Yes, on the Pro and Enterprise plans. Grammarly includes an AI detector that flags text likely to have been written by an AI model, alongside its plagiarism checker.
Is Grammarly still a separate company?
Grammarly is now part of Superhuman, and its writing tools are offered alongside Superhuman's other productivity products, though Grammarly's core writing assistant is still available on its own plans.
Learn more at Grammarly.