Grammarly
The writing assistant on every browser
Overview
Grammarly has evolved from a spellchecker into a full AI writing partner used by over 30 million people daily. For business owners, it sits quietly in the background of every app you write in — fixing mistakes, sharpening tone, and rewriting clunky sentences before they ever reach a client.
The GrammarlyGO generative layer now drafts emails, rewrites for tone, and summarises long threads — directly inside Gmail, Outlook, Google Docs and Slack without switching tabs.
For any business owner whose reputation depends on how they write, Grammarly is one of the highest-ROI AI subscriptions available.
Grammarly is one of those rare tools that pays for itself within a week. If you write for a living — and every business owner does — install the free version today. The Pro plan is worth every penny for the rewrite and tone features alone.
Scores
Grammarly category scores
How it compares overall
Key features
Real-Time Checking
Grammar, spelling, punctuation and clarity suggestions as you type, in any app.
Tone Detector
Shows how your message will read — confident, friendly, formal — before you send it.
Rewrite & Shorten
Highlight any passage and get instant rewrites for clarity, length or tone.
Email Drafting
GrammarlyGO generates full email replies from a one-line prompt inside Gmail and Outlook.
Plagiarism Checker
Scans billions of web pages to check originality — useful for content teams.
Everywhere You Write
Browser extension, desktop app, mobile keyboard and native Microsoft Office integration.
Pricing
Free
- Grammar & spelling
- Basic tone suggestions
- 100 GrammarlyGO prompts
- Browser extension
Pro
- Advanced rewrites
- Full tone control
- 1,000 GrammarlyGO prompts
- Plagiarism detection
Business
- Brand voice & style guide
- Team analytics
- Admin controls
- Priority support
Pros & cons
What works
- Works silently across every app you use
- Best-in-class grammar and clarity engine
- GrammarlyGO brings generative AI directly into your inbox
- Strong free tier covers core needs
- Team and Business plans with style guides and brand voice
- Tone detector genuinely improves client communication
What to watch
- Premium features require paid plan
- Can be over-eager with style suggestions
- Not a full replacement for ChatGPT for long-form drafting
- Privacy-sensitive industries need the Enterprise plan
How Grammarly compares
| Feature | Grammarly | ProWritingAid | Hemingway |
|---|---|---|---|
| Free Tier | ✓ (generous) | ✗ | Limited |
| Integrations | Everywhere | Office & browser | Desktop only |
| Generative AI | GrammarlyGO | Rephrase tool | None |
| Tone Detection | Best-in-class | Good | Basic |
| Team Features | ✓ | ✓ | ✗ |
Best for
Reviewed: April 2026. Scores and pricing are checked periodically — see our methodology. Pricing can change after publication, so always confirm current plans on Grammarly's site before buying.