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Software · head to head

Grammarly vs SimilarWeb

Grammarly logo

Grammarly

Software

Great writing, simplified

From
Free
Rated
-
Full reviewWebsite
S

SimilarWeb

Software

Website traffic and competitive analysis

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; SimilarWeb browser extension data accuracy is lower than full platform
  • They diverge on capability: Grammarly covers Grammar checking, SimilarWeb covers Traffic analytics.

Where they differ

Only the attributes on which Grammarly and SimilarWeb actually diverge.

Attributes where Grammarly and SimilarWeb differ
AttributeGrammarlySimilarWeb
Pricing modelUnknownfreemium
PlatformsWeb, macOS, Windows, iOS, AndroidWeb, Browser Extension
Founded20092007

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

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

  • Grammar checking
  • Spelling correction
  • Punctuation
  • Clarity suggestions
  • Engagement feedback
  • Delivery insights
  • Plagiarism checker
  • Citation generator

Only in SimilarWeb

  • Traffic analytics
  • Audience insights
  • Competitor research
  • Industry analysis
  • Chrome support
  • Firefox support
  • Edge support

What people use each for

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

Grammarly

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

SimilarWeb

No use cases recorded yet. See the SimilarWeb review.

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

SimilarWeb

  • Browser extension data accuracy is lower than full platform
  • Full platform pricing is not transparent and requires quote-based inquiry

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

SimilarWeb

Free
  • FreeFree
    • Traffic overview
    • Engagement metrics
    • Similar sites

Which should you pick?

Choose Grammarly if

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

Choose SimilarWeb if

  • You need traffic analytics.
  • You want to start without paying.
  • You work on Web, Browser Extension.
  • You also want audience insights.
SimilarWeb review

Questions people ask

Is Grammarly or SimilarWeb better?
Neither clearly leads. Grammarly starts at Free and SimilarWeb at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Grammarly or SimilarWeb?
Grammarly starts at Free and SimilarWeb at Free.
Does Grammarly or SimilarWeb run on more platforms?
Grammarly runs on Web, macOS, Windows, iOS, Android. SimilarWeb runs on Web, Browser Extension.
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 SimilarWeb is typically brought in for.
What can Grammarly do that SimilarWeb cannot?
Grammarly covers Grammar checking, Spelling correction, Punctuation, Clarity suggestions. SimilarWeb covers Traffic analytics, Audience insights, Competitor research, Industry analysis.

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
SimilarWeb: Is the SimilarWeb browser extension free?

Yes. The SimilarWeb browser extension is completely free to install and use with no paid tiers and no credit card required.

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
SimilarWeb: How many websites does SimilarWeb cover?

SimilarWeb provides access to intelligence from 1B+ websites and 8M apps, tracks 5B search terms and 250M display ads across 190 countries and 210 industries.

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
SimilarWeb: How accurate is SimilarWeb extension data?

Browser extension data accuracy is lower than the full platform, but it is adequate for ballpark figures of traffic estimates.

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
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