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Browser Extensions · head to head

LanguageTool vs Mercury Reader

LanguageTool logo

LanguageTool

Browser Extensions

Grammar and spell checker for 25+ languages

From
Free
Rated
-
Full reviewWebsite
M

Mercury Reader

Browser Extensions

Clear clutter from articles instantly

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: LanguageTool free tier limited to basic spelling and simple punctuation; advanced punctuation and style issues caught only on premium; Mercury Reader mercury Reader's underlying engine (Postlight Parser) is free open source software licensed under Apache License 2.0, per the GitHub repository, with no paid tier
  • They diverge on capability: LanguageTool covers Multi-language support, Mercury Reader covers Content extraction.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which LanguageTool and Mercury Reader actually diverge.

Attributes where LanguageTool and Mercury Reader differ
AttributeLanguageToolMercury Reader
Pricing modelfreemiumfree
PlatformsWeb editor, Windows desktop app, macOS desktop app, Chrome extension, Firefox extension, Edge extension, Safari extension, Opera extension, Google Docs, Microsoft Word, iOS appChrome, Firefox, Edge
Founded20032015

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

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 LanguageTool

  • Multi-language support
  • Grammar checking
  • Style suggestions
  • Personal dictionary
  • Safari support
  • Opera support

Only in Mercury Reader

  • Content extraction
  • Clean reading view
  • Custom themes
  • Font customization

Both cover

  • Chrome support
  • Firefox support
  • Edge support

What people use each for

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

LanguageTool

  • Grammar and spelling correction across web and desktopnot Mercury Reader
  • Style and clarity improvementsnot Mercury Reader
  • Multilingual writing assistancenot Mercury Reader

Mercury Reader

No use cases recorded yet. See the Mercury Reader review.

Where each one falls short

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

LanguageTool

  • Free tier limited to basic spelling and simple punctuation; advanced punctuation and style issues caught only on premium
  • Picky Mode (advanced typography) unavailable on free plan
  • Specific pricing not displayed on main page; requires navigation to purchase flow

Mercury Reader

  • Mercury Reader's underlying engine (Postlight Parser) is free open source software licensed under Apache License 2.0, per the GitHub repository, with no paid tier

Pricing, plan by plan

LanguageTool

Free
  • BasicFree
    • 2,000 character limit per text
    • 3 AI paraphrasing requests per day
    • Basic grammar and spelling checks
  • Premium$null/month
    • 150,000 character limit per text
    • Unlimited AI paraphrasing
    • 20,000+ grammar and style checks
  • Teams$null/month
    • Per-user, per-month pricing
    • 2-1000+ users
    • Team Style Guide

Mercury Reader

Free
  • FreeFree
    • Clutter removal
    • Clean reading
    • Custom themes

Which should you pick?

Choose LanguageTool if

  • You need multi-language support.
  • You want to start without paying.
  • You work on Web editor, Windows desktop app, macOS desktop app, Chrome extension, Firefox extension, Edge extension, Safari extension, Opera extension, Google Docs, Microsoft Word, iOS app.
  • You also want grammar checking.
LanguageTool review

Choose Mercury Reader if

  • You need content extraction.
  • You want to start without paying.
  • You work on Chrome, Firefox, Edge.
  • You also want clean reading view.
Mercury Reader review

Questions people ask

Is LanguageTool or Mercury Reader better?
Neither clearly leads. LanguageTool starts at Free and Mercury Reader at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, LanguageTool or Mercury Reader?
LanguageTool starts at Free and Mercury Reader at Free.
Does LanguageTool or Mercury Reader run on more platforms?
LanguageTool runs on Web editor, Windows desktop app, macOS desktop app, Chrome extension, Firefox extension, Edge extension, Safari extension, Opera extension, Google Docs, Microsoft Word, iOS app. Mercury Reader runs on Chrome, Firefox, Edge.
Can I use LanguageTool for free?
Both have a free tier, so you can try either at no cost before committing.
What is LanguageTool best used for?
LanguageTool is most often used for grammar and spelling correction across web and desktop, style and clarity improvements, multilingual writing assistance. Of those, grammar and spelling correction across web and desktop and style and clarity improvements are not what Mercury Reader is typically brought in for.
What can LanguageTool do that Mercury Reader cannot?
LanguageTool covers Multi-language support, Grammar checking, Style suggestions, Personal dictionary. Mercury Reader covers Content extraction, Clean reading view, Custom themes, Font customization. Both handle Chrome support, Firefox support, Edge support.

Answered from the vendors’ own pages

LanguageTool: Does LanguageTool have a free version?

Yes, LanguageTool Basic is free with a 2,000 character limit per text field and 3 AI paraphrasing requests per day for basic grammar and spelling checks.

Source
LanguageTool: What does LanguageTool Premium offer?

LanguageTool Premium increases the character limit to 150,000 per text field, provides unlimited AI paraphrasing, and includes 20,000+ advanced grammar and style checks. Multiple billing options are available including monthly, quarterly, annual, and 2-year plans.

Source
LanguageTool: Does LanguageTool offer a money-back guarantee?

Yes, LanguageTool provides a 14-day money-back guarantee on all Premium packages with no period of notice required; cancel anytime.

Source
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