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Browser Extensions · head to head

ProWritingAid vs Userscripts

ProWritingAid logo

ProWritingAid

Browser Extensions

AI writing assistant and grammar checker

From
Free
Rated
-
Full reviewWebsite
Userscripts logo

Userscripts

Browser Extensions

Open-source userscript manager for Safari on Mac and iOS

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; Userscripts safari cannot let extensions bypass a site's Content Security Policy, so strict sites produce "Refused to execute a script" errors that the @inject-into workaround does not always fix.
  • They diverge on capability: ProWritingAid covers Grammar checking, Userscripts covers Built-in script editor.
  • Prices and features above were last checked on 15 September 2026.

Where they differ

Only the attributes on which ProWritingAid and Userscripts actually diverge.

Attributes where ProWritingAid and Userscripts differ
AttributeProWritingAidUserscripts
Pricing modelfreemiumopen-source
PlatformsWeb, Windows, Mac, Chrome, Firefox, EdgeSafari, macOS, iOS
Founded2013Unknown

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

Only in Userscripts

  • Built-in script editor
  • Standard metadata support
  • GM API
  • Remote script updating
  • iCloud sync
  • Per-page popup

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 Userscripts
  • Story planning and structure analysisnot Userscripts
  • Character and manuscript analysis for fiction writersnot Userscripts
  • Integration with Microsoft Word, Google Docs, Scrivener, and Notionnot Userscripts

Userscripts

  • Running userscripts on Safari without paying for Tampermonkeynot ProWritingAid
  • Running userscripts on an iPhone or iPadnot ProWritingAid
  • Writing scripts on a Mac and syncing them to iOSnot ProWritingAid
  • Blocking or restyling site elements Safari content blockers cannot reachnot ProWritingAid
  • Keeping a script library under an open-source licencenot 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)

Userscripts

  • Safari cannot let extensions bypass a site's Content Security Policy, so strict sites produce "Refused to execute a script" errors that the @inject-into workaround does not always fix.
  • Apple only. There is no Chrome, Firefox or Edge build, so it cannot be a cross-browser answer.
  • iCloud sync is documented as having delays, which is awkward when editing the same script on two devices.
  • Requires macOS 12 and Safari 14.1, or iOS 15.1, so older Apple hardware is excluded.
  • GPL v3 means a commercial licence is required for non-open-source use, which matters if you are embedding rather than just using it.

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

Userscripts

Free
  • FreeFree
    • Full functionality
    • GPL v3 licensed
    • macOS, iOS and iPadOS

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 Userscripts if

  • You need built-in script editor.
  • You want to start without paying.
  • You work on Safari, macOS, iOS.
  • You also want standard metadata support.
Userscripts review

Questions people ask

Is ProWritingAid or Userscripts better?
Neither clearly leads. ProWritingAid starts at Free and Userscripts at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, ProWritingAid or Userscripts?
ProWritingAid starts at Free and Userscripts at Free.
Does ProWritingAid or Userscripts run on more platforms?
ProWritingAid runs on Web, Windows, Mac, Chrome, Firefox, Edge. Userscripts runs on Safari, macOS, iOS.
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 Userscripts is typically brought in for.
What can ProWritingAid do that Userscripts cannot?
ProWritingAid covers Grammar checking, Style analysis, Readability reports, Plagiarism checker. Userscripts covers Built-in script editor, Standard metadata support, GM API, Remote script updating.

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
Userscripts: Is Userscripts for Safari free?

Yes, free on the App Store and licensed under GPL v3. A commercial licence is required for use in something that is not itself open source.

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
Userscripts: Does it work on iPhone?

Yes, on iOS and iPadOS 15.1 or later, which makes it one of the few ways to run userscripts on an iPhone.

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
Userscripts: Why do I get "Refused to execute a script" errors?

Safari does not let extensions bypass a site's Content Security Policy the way other browsers do. The documented workaround is changing the script's @inject-into setting, though it does not resolve every case.

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
Userscripts: Do my scripts sync between Mac and iPhone?

Yes, over iCloud, though the project notes the sync can be delayed rather than immediate.

Source
Userscripts: What are the system requirements?

macOS 12 or later with Safari 14.1 or later, or iOS and iPadOS 15.1 or later.

Source
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