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Browser Extensions · head to head

ProWritingAid vs Tampermonkey

ProWritingAid logo

ProWritingAid

Browser Extensions

AI writing assistant and grammar checker

From
Free
Rated
-
Full reviewWebsite
Tampermonkey logo

Tampermonkey

Browser Extensions

The most popular userscript manager

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: ProWritingAid free plan limited to 500 word count with only 2 report runs per day; Tampermonkey only source code up to version 2.9 is GPLv3; all newer versions are distributed under a proprietary license despite the extension itself being free to use
  • They diverge on capability: ProWritingAid covers Grammar checking, Tampermonkey covers Userscript management.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which ProWritingAid and Tampermonkey actually diverge.

Attributes where ProWritingAid and Tampermonkey differ
AttributeProWritingAidTampermonkey
Pricing modelfreemiumopen-source
PlatformsWeb, Windows, Mac, Chrome, Firefox, EdgeWeb, Windows, macOS, Linux, Android
Founded20132010

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 ProWritingAid

  • Grammar checking
  • Style analysis
  • Readability reports
  • Plagiarism checker

Only in Tampermonkey

  • Userscript management
  • Script editor
  • Auto-update
  • Cloud sync
  • Opera support

Both cover

  • Chrome support
  • Firefox support
  • Edge support
  • Safari support

What people use each for

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

ProWritingAid

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

Tampermonkey

  • Auto-run custom JavaScript to add features to specific websitesnot ProWritingAid
  • Block ads, remove clutter, or reformat page layout via community/personal userscriptsnot ProWritingAid
  • Run scripts sourced from Greasy Fork or similar userscript repositoriesnot ProWritingAid
  • Automate repetitive web tasks such as form-filling or redirect skipping via installed scriptsnot ProWritingAid

Where each one falls short

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

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)

Tampermonkey

  • Only source code up to version 2.9 is GPLv3; all newer versions are distributed under a proprietary license despite the extension itself being free to use
  • Under Manifest V3, GM_webRequest is not (yet) supported
  • Under Manifest V3, GM_xmlhttpRequest fires only one progress event instead of streaming progress, requiring a responseType: 'stream' workaround
  • Since v5.3.2, Chrome/Edge (MV3) requires the user to manually enable Developer Mode, or from Chrome 138+ a per-extension 'Allow User Scripts' toggle, before any userscript will run

Pricing, plan by plan

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

Tampermonkey

Free

No published plan breakdown. See the Tampermonkey review.

Which should you pick?

Choose ProWritingAid if

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

Choose Tampermonkey if

  • You need userscript management.
  • You want to start without paying.
  • You work on Web, Windows, macOS, Linux, Android.
  • You also want script editor.
Tampermonkey review

Questions people ask

Is ProWritingAid or Tampermonkey better?
Neither clearly leads. ProWritingAid starts at Free and Tampermonkey at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, ProWritingAid or Tampermonkey?
ProWritingAid starts at Free and Tampermonkey at Free.
Does ProWritingAid or Tampermonkey run on more platforms?
ProWritingAid runs on Web, Windows, Mac, Chrome, Firefox, Edge. Tampermonkey runs on Web, Windows, macOS, Linux, Android.
Can I use ProWritingAid for free?
Both have a free tier, so you can try either at no cost before committing.
What is ProWritingAid best used for?
ProWritingAid is most often used for grammar and style checking for writers and authors, story planning and structure analysis, character and manuscript analysis for fiction writers, integration with microsoft word, google docs, scrivener, and notion. Of those, grammar and style checking for writers and authors and story planning and structure analysis are not what Tampermonkey is typically brought in for.
What can ProWritingAid do that Tampermonkey cannot?
ProWritingAid covers Grammar checking, Style analysis, Readability reports, Plagiarism checker. Tampermonkey covers Userscript management, Script editor, Auto-update, Cloud sync. Both handle Chrome support, Firefox support, Edge support, Safari support.

Answered from the vendors’ own pages

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
Tampermonkey: How much does Tampermonkey cost?

Tampermonkey is completely free for all versions and across all supported browsers including Chrome, Edge, Safari, Opera, and Firefox.

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
Tampermonkey: Is Tampermonkey available on all browsers?

Yes, Tampermonkey is available on Chrome 120 and later, Microsoft Edge, Safari, Opera Next, and Firefox with no cost.

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
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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