AI paraphraser, grammar checker, summarizer and AI detector popular with students and writers.
Grammarly vs Writesonic
Features, pricing, strengths and trade-offs — and which one fits your situation.
The verdict
Summary
Grammarly is best for catching errors and polishing tone in everyday writing across the apps you already use, while Writesonic is best for sEO content plus tracking and improving brand visibility in AI search engines. Only Grammarly offers grammar & style checking. Grammarly has a low learning curve, compared with medium for Writesonic. Grammarly has a free plan, while Writesonic has no free plan.
Which should you choose?
Choose Grammarly if…
- You need catching errors and polishing tone in everyday writing across the apps you already use
- Grammar & style checking matters to you
- You're one of: professionals writing emails and documents, students, non-native english writers
- You want a free plan (Writesonic doesn't have one)
- You want something quicker to learn
Choose Writesonic if…
- You need sEO content plus tracking and improving brand visibility in AI search engines
- You're one of: seo and content marketing teams, agencies, ecommerce brands
- Combines AI search tracking with content creation in one tool
At a glance
| Grammarly | Writesonic | |
|---|---|---|
| Best for | Catching errors and polishing tone in everyday writing across the apps you already use | SEO content plus tracking and improving brand visibility in AI search engines |
| Free plan | Yes | No |
| Starting price | From $12/mo | From $79/mo |
| Learning curve | Low | Medium |
| Platforms | Web, Windows, macOS, iOS, Android, Chrome extension | Web, API |
| Ideal for | Professionals writing emails and documents, Students, Non-native English writers, Business and support teams | SEO and content marketing teams, Agencies, Ecommerce brands |
Feature comparison
| Grammarly | Writesonic | |
|---|---|---|
| Grammar & style checking | Yes | No |
| Paraphrasing / rewriting | Paid plans only | — |
| Long-form drafting | Limited | Yes |
| Brand voice / style guide | Paid plans only | Yes |
| Plagiarism checker | Paid plans only | — |
| AI content detection | Paid plans only | — |
| Works in browser / other apps | Yes | — |
| Languages | English + 5 (translation 19) | 50+ |
| Team workspace | Yes | Yes |
IncludedLimited / higher plansNot available— Not confirmed
Security & enterprise
| Grammarly | Writesonic | |
|---|---|---|
| Business / enterprise plan | Yes | Yes |
| SSO (SAML / OIDC) | Enterprise plan | Enterprise plan |
| SCIM user provisioning | — | — |
| SOC 2 | Type II | Type II |
| ISO 27001 | Yes | — |
| HIPAA (BAA available) | Enterprise (BAA) | — |
| GDPR DPA | Yes | — |
| Data residency options | — | — |
| No training on your data | — | — |
| Audit logs | — | Enterprise plan |
| Admin controls | Yes | Yes |
| Deployment | Cloud | Cloud |
From each vendor's security documentation. "—" = not confirmed. What to ask vendors · Compare all tools
What each tool does
Grammarly
Grammarly is an AI writing assistant that checks grammar, spelling, clarity and tone as you type in browsers, desktop apps, Microsoft Office, Google Docs and mobile keyboards. It also generates and rewrites text, and paid plans add plagiarism and AI-content detection, style guides and brand tones. Its parent company rebranded as Superhuman in 2025, but Grammarly continues as the writing assistant product.
Key features- Real-time grammar, spelling, clarity and tone suggestions
- Full-sentence rewrites and generative AI prompts
- Plagiarism and AI-content detection (paid)
- Style guides and brand tones for teams
- Grammar checks in five languages beyond English, translation into 19
- Works in browsers, desktop apps, Office, Google Docs and mobile
Writesonic
Writesonic has shifted from a general AI writer to an AI search visibility (GEO) and SEO content platform. It tracks how brands appear across ChatGPT, Gemini, Perplexity, Google AI results and other AI platforms, suggests fixes, and includes an AI article writer, brand voice, Chatsonic chat and technical audits for AI crawlers. Marketing teams, SEO agencies and ecommerce brands are its main users.
Key features- AI search visibility tracking across 10+ AI platforms
- Action Center ranking content and citation opportunities
- AI Article Writer for SEO content
- Brand Voice trained on your existing content
- Technical audits for AI crawlers (robots.txt, schema)
- WordPress, Google Search Console and Analytics integrations
Pricing
Grammarly
Free plan. Pro ~$12/mo billed annually or ~$30 monthly. Enterprise custom.
Writesonic
No free plan (free start, no card). Paid from $79/mo (Starter); Basic $199, Growth $399; Enterprise custom. ~20% off annual.
Prices last checked September 2026. Plans change often — confirm on each vendor's site.
Pros and cons
Grammarly
Strengths- Works almost everywhere you type, including a mobile keyboard
- Clear, easy-to-accept suggestions with little setup
- Team features include style guides, snippets and analytics
- Has a useful free plan
- Rewrites, tone adjustment, plagiarism and AI detection require a paid plan
- Generative AI prompts are capped per month except on Enterprise
- Less depth for fiction and long manuscripts than specialist editors
- Full-sentence grammar support outside English covers only five languages
Not ideal for: Novelists wanting in-depth manuscript analysis, or marketers who need long-form content generated at scale, should look at specialist tools.
Writesonic
Strengths- Combines AI search tracking with content creation in one tool
- Brand voice applied across generated content
- Writes in 50+ languages
- White-label options for agencies
- No ongoing free plan and a high entry price for individuals
- Focus has moved to GEO/SEO, so simple copywriting tools get less attention
- Not a grammar or proofreading assistant for your own writing
- Platform breadth takes time to learn
Not ideal for: Individuals who only need occasional copy or proofreading will pay for many features they will not use.
Integrations
Grammarly
Writesonic
FAQ
What is the main difference between Grammarly and Writesonic?
Grammarly is built for catching errors and polishing tone in everyday writing across the apps you already use; Writesonic is built for sEO content plus tracking and improving brand visibility in AI search engines. Key differences: Grammarly offers grammar & style checking.
Is Grammarly or Writesonic cheaper?
Grammarly starts from $12/mo and Writesonic starts from $79/mo (as of September 2026). On entry price, Grammarly is cheaper — but compare what each plan includes, since limits differ. Always confirm current pricing on each vendor's site.
Do Grammarly and Writesonic have free plans?
Grammarly has a free plan, while Writesonic has no free plan.
Which is easier to use, Grammarly or Writesonic?
Grammarly is generally quicker to learn (Grammarly: low, Writesonic: medium learning curve).
What are good alternatives to Grammarly and Writesonic?
Other writing tools worth comparing include QuillBot, Koala AI and Rytr.
