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Grammarly vs ProWritingAid

Grammarly logo

Grammarly

Documentation

Great writing, simplified

From
Free
Rated
-
Full reviewWebsite
ProWritingAid logo

ProWritingAid

Browser Extensions

AI writing assistant and grammar checker

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Grammarly occasional false positives and grammatically incorrect suggestions that can introduce errors; ProWritingAid free plan limited to 500 word count with only 2 report runs per day
  • They diverge on capability: Grammarly covers Spelling correction, ProWritingAid covers Style analysis.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Grammarly and ProWritingAid actually diverge.

Attributes where Grammarly and ProWritingAid differ
AttributeGrammarlyProWritingAid
Pricing modelUnknownfreemium
PlatformsWeb, macOS, Windows, iOS, AndroidWeb, Windows, Mac, Chrome, Firefox, Edge
CategoryDocumentationBrowser Extensions
Founded20092013

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Grammarly

  • Spelling correction
  • Punctuation
  • Clarity suggestions
  • Engagement feedback
  • Delivery insights
  • Citation generator
  • Chrome
  • Safari

Only in ProWritingAid

  • Style analysis
  • Readability reports
  • Chrome support
  • Firefox support
  • Edge support
  • Safari support

Both cover

  • Grammar checking
  • Plagiarism checker

What people use each for

The jobs each tool is most often brought in to do.

Grammarly

  • Email writingnot ProWritingAid
  • Document editingnot ProWritingAid
  • Academic writingnot ProWritingAid
  • Business communicationnot ProWritingAid
  • Content creationnot ProWritingAid

ProWritingAid

  • Grammar and style checking for writers and authorsnot Grammarly
  • Story planning and structure analysisnot Grammarly
  • Character and manuscript analysis for fiction writersnot Grammarly
  • Integration with Microsoft Word, Google Docs, Scrivener, and Notionnot Grammarly

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Grammarly

  • Occasional false positives and grammatically incorrect suggestions that can introduce errors
  • Privacy concerns about sending text to Grammarly's servers for analysis
  • AI capabilities sometimes produce hallucinations and fabricated citations that appear grammatically correct

ProWritingAid

  • Free plan limited to 500 word count with only 2 report runs per day
  • Advanced AI features (50 Sparks per day, Chapter Critiques) only in Premium Pro tier
  • Desktop apps for Mac and Windows; iOS/Android support limited to specific integrations
  • Yearly subscriptions significantly more cost-effective than monthly (67% savings)

Pricing, plan by plan

Grammarly

Free
  • FreeFree
    • Basic grammar and spelling checks
    • Tone visibility
    • 100 AI prompts per month
  • Pro$12/month
    • Sentence rewrites
    • Tone adjustment
    • Plagiarism and AI detection

ProWritingAid

Free
  • FreeFree
    • Basic grammar and spelling checks
    • 500-word limit per check
    • 2 report runs daily
  • Premium$30/month
    • Unlimited word count
    • Unlimited rephrases
    • 5 Sparks daily
  • Premium Pro$36/month
    • All Premium features
    • 50 Sparks daily
    • 3 Chapter Critiques daily

Which should you pick?

Choose Grammarly if

  • You need spelling correction.
  • You want to start without paying.
  • You work on Web, macOS, Windows, iOS, Android.
  • You also want punctuation.
Grammarly review

Choose ProWritingAid if

  • You need style analysis.
  • You want to start without paying.
  • You work on Web, Windows, Mac, Chrome, Firefox, Edge.
  • You also want readability reports.
ProWritingAid review

Questions people ask

Is Grammarly or ProWritingAid better?
Neither clearly leads. Grammarly starts at Free and ProWritingAid at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Grammarly or ProWritingAid?
Grammarly starts at Free and ProWritingAid at Free.
Does Grammarly or ProWritingAid run on more platforms?
Grammarly runs on Web, macOS, Windows, iOS, Android. ProWritingAid runs on Web, Windows, Mac, Chrome, Firefox, Edge.
Can I use Grammarly for free?
Both have a free tier, so you can try either at no cost before committing.
What is Grammarly best used for?
Grammarly is most often used for email writing, document editing, academic writing, business communication. Of those, email writing and document editing are not what ProWritingAid is typically brought in for.
What can Grammarly do that ProWritingAid cannot?
Grammarly covers Spelling correction, Punctuation, Clarity suggestions, Engagement feedback. ProWritingAid covers Style analysis, Readability reports, Chrome support, Firefox support. Both handle Grammar checking, Plagiarism checker.

Answered from the vendors’ own pages

Grammarly: Does Grammarly have a free version?

Yes, Grammarly offers a free tier with basic spelling, grammar, and punctuation checks, tone visibility, and 100 AI prompts per month. The Pro plan ($12/month annual) adds sentence rewriting, plagiarism detection, and 2,000 AI prompts.

Source
ProWritingAid: How much does ProWritingAid cost?

ProWritingAid is free. Premium plan costs $30/month ($120/year), and Premium Pro costs $36/month ($144/year). Both yearly plans offer significant monthly savings. Lifetime options cost $399 (Premium) or $699 (Premium Pro).

Source
Grammarly: What platforms does Grammarly work with?

Grammarly works across 1 million+ apps including Google Docs, Microsoft Word, Outlook, Slack, Gmail, and web browsers. It also integrates with productivity tools like Asana, Jira, Monday.com, Confluence, and HubSpot.

Source
ProWritingAid: Is there a free version of ProWritingAid?

Yes. The free plan includes basic grammar and spelling checks with a 500-word limit per check, 2 report runs daily, 10 rephrases daily, and 3 Sparks daily.

Source
Grammarly: Can I use Grammarly offline?

Grammarly requires an internet connection to function, though the browser extension works with some offline text areas. For offline use, the desktop app and browser extensions sync when reconnected.

Source
ProWritingAid: What is the difference between Premium and Premium Pro?

Premium ($30/month) includes 25+ analysis reports and 1 Chapter Critique daily. Premium Pro ($36/month) adds 50 Sparks daily, 3 Chapter Critiques daily, live workshops, and group critique sessions.

Source
Grammarly: What is included in the Enterprise plan?

The Enterprise plan includes unlimited team members, dedicated support, custom roles and permissions, data loss prevention, bring-your-own-key encryption, and unlimited AI prompts. Pricing is custom and available by contacting sales.

Source
ProWritingAid: Does ProWritingAid offer a refund guarantee?

ProWritingAid offers a 3-day money-back guarantee for yearly and lifetime subscriptions. Monthly plans have no refund option.

Source
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