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AI Writing Comparison

Grammarly vs. Writesonic

At a glance

At a glance

Grammarly

Best for

Best for individuals and teams who want grammar, clarity and tone help across every app they write in.

  • Freelancers
  • Small and mid-sized
  • Enterprise

Writesonic

Best for

Best for creators and teams producing SEO-optimised long-form content.

  • Freelancers
  • Small and mid-sized

Cataleo does not name a winner. Both statements come from the vendors themselves.

Full Comparison

Criterion Grammarly Writesonic
Starting price Free tier; Pro from $12 / user / month $12 per member per month billed annually, $30 billed monthly. Enterprise is custom. From ~$39 to $49 / month
Free trial Free tier with 100 AI prompts per month Free tier available
Commercial use Yes Yes
Output Grammar, clarity and tone suggestions, plus generative AI drafts SEO long-form content and ads
Content types Emails, documents, business and academic writing SEO long-form articles and ad copy
Brand voice Yes, brand tone and style guide (unlimited on Enterprise) Yes, a named writing style trained on a PDF, DOC or DOCX upload of up to 10 MB, a link to a page, or pasted text, then applied to tone, vocabulary, sentence structure and audience
Content scoring Yes, writing performance score and tone detection Yes, SERP and content scoring inside the drafting flow
Drafting tools Yes, generative AI prompts, rewrites and tone adjustments AI article writer plus agents that rewrite pages for AI-search citation
Templates No preset template library; generation runs from prompts and built-in AI agents Yes
Team workflows Yes, team analytics, snippets and shared style guide Yes, role-based approval workflows and multi-client management
API No public API; the Text Editor SDK for developers was discontinued in 2024 Yes
Deployment Cloud (SaaS), Browser-based Cloud (SaaS), Browser-based
Company size more entries Freelancers, Small and mid-sized, Enterprise Freelancers, Small and mid-sized
Integrations Not stated Google Analytics, Google Search Console, Looker Studio, WordPress

Compare more tools

Row where the values differ The small markers point at the lower number, the longer list or the stated feature. They describe the data, they are not a verdict.

The short version

Key Differences

  • Starting price Grammarly Free tier; Pro from $12 / user / month Writesonic From ~$39 to $49 / month
  • Free trial Grammarly Free tier with 100 AI prompts per month Writesonic Free tier available
  • Company size Grammarly Freelancers, Small and mid-sized, Enterprise Writesonic Freelancers, Small and mid-sized
  • Output Grammarly Grammar, clarity and tone suggestions, plus generative AI drafts Writesonic SEO long-form content and ads
  • Content types Grammarly Emails, documents, business and academic writing Writesonic SEO long-form articles and ad copy

Every line is one datapoint from the table above, picked automatically. Nothing here is written text.

The trade-offs

Strengths and Limitations

Grammarly

Strengths

  • Free tier is genuinely useful for everyday writing
  • Works across apps and browsers through extensions
  • Brand tones and style guides keep a consistent voice

Limitations

  • Generative AI is capped by monthly prompt limits
  • Enterprise pricing is custom, not published

Writesonic

Strengths

  • SEO scoring built into drafting
  • Strong long-form
  • All-in-one

Limitations

  • Mid to higher price
  • Jack of all trades versus specialists

Plans

Pricing

Grammarly

  • Free $0 100 AI prompts per month.
  • Pro $12 Per member per month billed annually. $30 billed monthly.
  • Enterprise Custom Contact sales.
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Writesonic

  • Free $0 Free tier available, allowance not stated.
  • Not stated ~$39 to $49 Per month.
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What users say

Review Scores · opens after launch

Grammarly

Ease of use
Not rated yet
User interface
Not rated yet
Onboarding
Not rated yet
Support and service
Not rated yet
Value for money
Not rated yet
Features
Not rated yet

No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.

Writesonic

Ease of use
Not rated yet
User interface
Not rated yet
Onboarding
Not rated yet
Support and service
Not rated yet
Value for money
Not rated yet
Features
Not rated yet

No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.

Where this comes from

Where this comes from

Grammarly https://www.grammarly.com · no check date recorded yet

Writesonic https://writesonic.com · no check date recorded yet

This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.