| Feature | Grammarly | Writesonic |
|---|---|---|
| What it does | AI writing assistant for grammar and tone. | AI writer for SEO and marketing content. |
| Made by | Grammarly | Writesonic |
| Free plan | yes | no |
| Price | Free plan available; paid from $12/month (Pro) | Paid only; paid from $79/month billed annually (Starter) |
| Pricing checked | Last verified Oct 15, 2026 | Last verified Oct 15, 2026 |
| Skill level | beginner | intermediate |
| Platforms | web, ios, android, windows, mac, browser-extension | web |
| Privacy | See the tool page | See the tool page |
Who Grammarly is for
Anyone who writes emails, reports, essays or posts and wants to catch mistakes and sound clearer.
Good points
- Works almost everywhere you type (browser, Word, email, desktop)
- Free plan catches spelling and grammar mistakes
- Pro plan rewrites full sentences and adjusts tone
- Discounts for students and educational institutions
Watch out for
- Suggestions can flatten your personal voice if accepted blindly
- Best rewriting features require Pro
- It reads what you type, so check your organization's privacy rules
Who Writesonic is for
Businesses and marketers who care about being found in AI chat answers and search results.
Good points
- Tracks brand mentions across major AI assistants
- Includes AI article writing and site audits
- Start without a credit card
- Clear tiers that scale with your needs
Watch out for
- Pricing is aimed at businesses, not casual writers
- Its focus has shifted away from simple copywriting
- AI visibility metrics are still a new and evolving field
More comparisons
New to this? Read our free guide: Getting started with AI chat assistants: prompting basics.
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