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Browser Extensions · head to head

Stylus vs WhatFont

Stylus logo

Stylus

Browser Extensions

Restyle the web with custom CSS

From
Free
Rated
-
Full reviewWebsite
WhatFont logo

WhatFont

Browser Extensions

Identify fonts on web pages

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Stylus crashes and instability when applying certain styles; WhatFont can only detect web-safe fonts and fonts loaded via web font services
  • They diverge on capability: Stylus covers Custom CSS injection, WhatFont covers Font detection.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Stylus and WhatFont actually diverge.

Attributes where Stylus and WhatFont differ
AttributeStylusWhatFont
Pricing modelfreeUnknown
PlatformsChrome, Firefox, Edge, OperaChrome, Firefox, Arc
Founded20172011

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 Stylus

  • Custom CSS injection
  • Style management
  • userstyles.world integration
  • Built-in editor
  • Opera support

Only in WhatFont

  • Font detection
  • Typography info
  • Service detection
  • Hover inspection
  • Safari support

Both cover

  • Chrome support
  • Firefox support
  • Edge support

What people use each for

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

Stylus

  • Customizing website appearance with community-created CSS themesnot WhatFont
  • Writing personal style overrides for specific websitesnot WhatFont
  • Managing multiple styles across different websites automaticallynot WhatFont
  • Searching and installing user-styles for current websitesnot WhatFont
  • Migrating style collections from Stylish extensionnot WhatFont

WhatFont

  • Identifying typefaces used on competitor websites for design researchnot Stylus
  • Sourcing font inspiration from high-performing landing pagesnot Stylus
  • Discovering web font services like Google Fonts or Typekit on sitesnot Stylus

Where each one falls short

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

Stylus

  • Crashes and instability when applying certain styles
  • No visual element selector tool for identifying page elements to style
  • Security risk if downloading and applying untrusted user-created styles

WhatFont

  • Can only detect web-safe fonts and fonts loaded via web font services
  • Does not work on images with embedded text or rasterized typography
  • Limited to inspecting single text elements at a time

Pricing, plan by plan

Stylus

Free
  • FreeFree
    • Custom CSS
    • Style library
    • Style editor

WhatFont

Free
  • FreeFree
    • Font inspection on any website
    • Font family identification
    • Font size and weight detection

Which should you pick?

Choose Stylus if

  • You need custom css injection.
  • You want to start without paying.
  • You work on Chrome, Firefox, Edge, Opera.
  • You also want style management.
Stylus review

Choose WhatFont if

  • You need font detection.
  • You want to start without paying.
  • You work on Chrome, Firefox, Arc.
  • You also want typography info.
WhatFont review

Questions people ask

Is Stylus or WhatFont better?
Neither clearly leads. Stylus starts at Free and WhatFont at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Stylus or WhatFont?
Stylus starts at Free and WhatFont at Free.
Does Stylus or WhatFont run on more platforms?
Stylus runs on Chrome, Firefox, Edge, Opera. WhatFont runs on Chrome, Firefox, Arc.
Can I use Stylus for free?
Both have a free tier, so you can try either at no cost before committing.
What is Stylus best used for?
Stylus is most often used for customizing website appearance with community-created css themes, writing personal style overrides for specific websites, managing multiple styles across different websites automatically, searching and installing user-styles for current websites. Of those, customizing website appearance with community-created css themes and writing personal style overrides for specific websites are not what WhatFont is typically brought in for.
What can Stylus do that WhatFont cannot?
Stylus covers Custom CSS injection, Style management, userstyles.world integration, Built-in editor. WhatFont covers Font detection, Typography info, Service detection, Hover inspection. Both handle Chrome support, Firefox support, Edge support.

Answered from the vendors’ own pages

Stylus: Is Stylus free?

Yes. Stylus is completely free and open-source, available for Chrome, Firefox, Edge, and Opera browsers.

Source
WhatFont: How do I use WhatFont to inspect fonts?

Click the WhatFont icon in your browser toolbar to activate it, then hover over any text on a webpage to see the font name and details in a pop-up. Click the text to reveal additional information like font style, weight, color, and font samples.

Source
Stylus: Can I use Stylus to change the browser UI?

No. Due to WebExtensions security restrictions, Stylus can only customize website pages, not the browser interface itself.

Source
WhatFont: What browsers does WhatFont support?

WhatFont works on Google Chrome, Firefox, and Arc browser. It is available as a free extension in each browser's extension store.

Source
Stylus: What CSS pre-processors does Stylus support?

Stylus supports CSS, LESS, and Stylus syntax with built-in linting using Stylelint and CSSLint-mod with customizable rules.

Source
WhatFont: Is WhatFont free?

Yes. WhatFont is a completely free browser extension with no paid tier or premium features. It is maintained as a free tool for designers and developers.

Source
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