Grammarly
The long-standing AI writing assistant, now with generative rewriting.
Description
Grammarly checks grammar, tone and clarity across the apps you already use, and has expanded into full generative rewriting, and brand-voice tools for teams.
Pros
- Works inline across almost any app or browser
- Tone detection is genuinely useful for email/Slack
- Free plan alone covers most casual needs
Cons
- Full generative features and higher prompt limits need the paid tier
- Suggestions occasionally flatten a distinctive writing voice
What it does & solves
Grammarly solves the 'catch mistakes before you hit send' problem across almost every app you write in — email, Slack, Docs, LinkedIn, your browser — rather than a single dedicated writing tool. Its underline-and-suggest model works inline as you type, flagging grammar, clarity, and tone issues, and it has grown beyond corrections into full generative rewriting, so you can also ask it to shorten, formalize, or restyle a passage on the spot. Because it lives everywhere you already write, it fits into an existing workflow instead of asking you to switch tools.
Use cases
- Catching grammar, spelling, and punctuation errors inline while writing anywhere
- Checking the tone of an email or Slack message before sending it
- Rewriting a paragraph to be shorter, more formal, or more concise on demand
- Keeping a consistent brand voice across a team's external communications (paid tiers)
- Getting real-time clarity suggestions while drafting long documents
- Proofreading academic or professional writing before submission
- Generating quick first drafts of short replies or messages
Who it's for
Useful for almost anyone who writes daily — students, professionals, non-native English writers, and teams that need consistent tone across communications. The free plan alone covers most casual, everyday proofreading needs with no learning curve at all; teams get more value from the paid tier's brand-voice and generative features once multiple people need to write in a consistent style.
Getting started
- 1Create a free account at grammarly.com and install the browser extension and/or desktop app.
- 2Enable Grammarly for the apps you use most — email, docs, browser — from the extension settings.
- 3Write normally; grammar, spelling, and clarity suggestions appear inline as you type.
- 4Use the tone detector and rewrite suggestions before sending anything important.
- 5Upgrade to Pro if you need full generative rewriting, more AI prompts, or team brand-voice controls.
Tips for using it well
- Set your goals (audience, formality, intent) in the Grammarly settings for a document — suggestions calibrate differently for a casual Slack message versus a formal report.
- Use the tone detector before sending anything sensitive — it catches wording that reads more curt or blunt than you intended.
- Don't accept every suggestion automatically; for distinctive or informal writing, some 'corrections' flatten voice more than they help.
- On Pro, the 2,000 monthly AI prompts are shared across generative rewrites and chat — save them for real editing tasks rather than casual back-and-forth.
- Install the browser extension and desktop app together so coverage follows you across web forms, email clients, and word processors.
Plans & pricing
Free plan: The Free plan covers grammar, spelling, punctuation, and basic tone detection across every supported app, plus about 100 AI prompts a month for generative writing and rewrites.
Pro
$12/month billed annually ($30/month billed monthly)
Covers individuals and teams up to 149 members, with 2,000 AI prompts per member per month, full generative rewriting, and brand-voice tools.
Enterprise
Custom pricing
Larger organizations needing admin controls, SSO, and centralized deployment.