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Browser Extensions · head to head

FireMonkey vs Hemingway Editor

FireMonkey logo

FireMonkey

Browser Extensions

User scripts and user styles in one Firefox extension

From
Free
Rated
-
Full reviewWebsite
Hemingway Editor logo

Hemingway Editor

Browser Extensions

Make your writing bold and clear

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: FireMonkey firefox only, and requires a recent one: version 93 on desktop, 113 on Android.; Hemingway Editor no grammar or spelling corrections; tool focuses only on style, readability, and clarity, leaving grammatical errors unflagged
  • They diverge on capability: FireMonkey covers Scripts and styles together, Hemingway Editor covers Readability analysis.
  • Prices and features above were last checked on 15 September 2026.

Where they differ

Only the attributes on which FireMonkey and Hemingway Editor actually diverge.

Attributes where FireMonkey and Hemingway Editor differ
AttributeFireMonkeyHemingway Editor
Pricing modelopen-sourceUnknown
PlatformsFirefoxWeb, macOS, Windows
FoundedUnknown2013

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 FireMonkey

  • Scripts and styles together
  • Monaco editor with ESLint
  • Unlimited client-side storage
  • Global injection
  • Notifications and clipboard
  • Firefox for Android

Only in Hemingway Editor

  • Readability analysis
  • Sentence complexity
  • Passive voice detection
  • Adverb highlighting
  • Chrome support
  • Firefox support
  • Edge support

What people use each for

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

FireMonkey

  • Running user scripts and user styles without two separate extensionsnot Hemingway Editor
  • Restyling sites with CSS alongside scripted behaviour changesnot Hemingway Editor
  • Editing scripts in a full editor inside the browsernot Hemingway Editor
  • Injecting CSS globally across every sitenot Hemingway Editor
  • Managing a mixed library of scripts and styles from one dashboardnot Hemingway Editor

Hemingway Editor

  • Checking readability and flagging dense sentencesnot FireMonkey
  • Grammar checking and proofreading a draftnot FireMonkey
  • Adjusting tone before publishingnot FireMonkey
  • Paraphrasing passages with the free web toolsnot FireMonkey

Where each one falls short

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

FireMonkey

  • Firefox only, and requires a recent one: version 93 on desktop, 113 on Android.
  • Not a drop-in replacement for Greasemonkey, Tampermonkey or Stylus. The project says so itself, so an existing library may need adjusting.
  • A much smaller user base than Tampermonkey or Violentmonkey, which means fewer people have hit the bug you are about to hit.
  • No Chrome, Edge or Safari build, so it cannot be the answer for anyone working across browsers.
  • Combining scripts and styles in one extension also combines the blast radius: one extension with permission to inject both into every page.

Hemingway Editor

  • No grammar or spelling corrections; tool focuses only on style, readability, and clarity, leaving grammatical errors unflagged
  • Cannot distinguish context for idioms and colloquialisms, sometimes suggesting inappropriate replacements that alter intended meaning
  • Free version cannot suggest fixes for highlighted issues, only displays problems without solutions
  • Not suitable for academic or formal writing where its simplicity bias penalizes legitimate complex sentence structures

Pricing, plan by plan

FireMonkey

Free
  • Open sourceFree
    • MPL-2.0 licensed
    • Unlimited scripts and styles
    • No account required

Hemingway Editor

Free
  • FreeFree
    • Readability checking
    • Sentence highlighting
    • Adverb detection
  • Hemingway Editor Plus Individual 5K$8.33/month
    • 5,000 AI sentence rewrites monthly
    • Advanced grammar fixes (unlimited)
    • Unlimited document review
  • Hemingway Editor Plus Individual 10K$12.5/month
    • 10,000 AI sentence rewrites monthly
    • Advanced grammar fixes (unlimited)
    • Unlimited document review
  • Hemingway Editor Plus Team 10K$12.5/month
    • 10,000 AI sentence rewrites per user monthly
    • Role-based admin controls
    • Priority support

Which should you pick?

Choose FireMonkey if

  • You need scripts and styles together.
  • You want to start without paying.
  • You work on Firefox.
  • You also want monaco editor with eslint.
FireMonkey review

Choose Hemingway Editor if

  • You need readability analysis.
  • You want to start without paying.
  • You work on Web, macOS, Windows.
  • You also want sentence complexity.
Hemingway Editor review

Questions people ask

Is FireMonkey or Hemingway Editor better?
Neither clearly leads. FireMonkey starts at Free and Hemingway Editor at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, FireMonkey or Hemingway Editor?
FireMonkey starts at Free and Hemingway Editor at Free.
Does FireMonkey or Hemingway Editor run on more platforms?
FireMonkey runs on Firefox. Hemingway Editor runs on Web, macOS, Windows.
Can I use FireMonkey for free?
Both have a free tier, so you can try either at no cost before committing.
What is FireMonkey best used for?
FireMonkey is most often used for running user scripts and user styles without two separate extensions, restyling sites with css alongside scripted behaviour changes, editing scripts in a full editor inside the browser, injecting css globally across every site. Of those, running user scripts and user styles without two separate extensions and restyling sites with css alongside scripted behaviour changes are not what Hemingway Editor is typically brought in for.
What can FireMonkey do that Hemingway Editor cannot?
FireMonkey covers Scripts and styles together, Monaco editor with ESLint, Unlimited client-side storage, Global injection. Hemingway Editor covers Readability analysis, Sentence complexity, Passive voice detection, Adverb highlighting.

Answered from the vendors’ own pages

FireMonkey: What makes FireMonkey different from Violentmonkey?

It manages user styles as well as user scripts. The usual arrangement is a script manager plus a separate style manager such as Stylus; FireMonkey replaces both with one extension.

Source
Hemingway Editor: Is there a free version and what does it include?

Yes. The free web version at hemingwayapp.com includes readability scoring, highlighting of complex sentences, passive voice detection, and weak adverb flagging. No account needed. Hemingway Editor Plus ($8.33/month or $100/year) adds advanced grammar fixes, AI sentence rewrites (10,000 monthly on best value plan), and unlimited document feedback.

Source
FireMonkey: Which browsers does FireMonkey support?

Firefox only. Desktop requires Firefox 93 or later and Android requires 113, with an API minimum of 102.

Source
Hemingway Editor: Does Hemingway Editor work offline?

The free web version requires internet. The desktop version for Mac and Windows ($19.99 one-time payment) works fully offline after download, enabling distraction-free writing without network connectivity.

Source
FireMonkey: Is FireMonkey open source?

Yes, under the MPL-2.0 licence.

Source
Hemingway Editor: What writing metrics does Hemingway measure?

Hemingway grades readability level, highlights adverbs and weak words, flags passive voice constructions, marks complex or hard-to-read sentences in color (red for very hard, yellow for difficult), and suggests simpler alternatives for complex phrases.

Source
FireMonkey: Will my existing Tampermonkey scripts work?

Not necessarily. The project states that while it shares functionality with Greasemonkey, Tampermonkey and Stylus, there are differences, so scripts and styles written for those may need adjusting.

Source
Hemingway Editor: Can I collaborate with others or share documents?

The web version allows pasting text directly, but Hemingway Editor itself does not have native collaboration or team features. Team plans on Hemingway Plus support $12.50/user/month pricing and role-based admin controls, but are primarily for shared workspace management rather than live document collaboration.

Source
FireMonkey: What editor does FireMonkey use?

Current versions use the Monaco editor with ESLint, the same editor component that powers VS Code.

Source
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