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Browser Extensions · head to head

SimilarWeb vs Stylus

SimilarWeb logo

SimilarWeb

Browser Extensions

Website traffic and competitive analysis

From
Free
Rated
-
Full reviewWebsite
Stylus logo

Stylus

Browser Extensions

Restyle the web with custom CSS

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: SimilarWeb browser extension data accuracy is lower than full platform; Stylus crashes and instability when applying certain styles
  • They diverge on capability: SimilarWeb covers Traffic analytics, Stylus covers Custom CSS injection.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which SimilarWeb and Stylus actually diverge.

Attributes where SimilarWeb and Stylus differ
AttributeSimilarWebStylus
Pricing modelfreemiumfree
PlatformsWeb, Browser ExtensionChrome, Firefox, Edge, Opera
Founded20072017

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 SimilarWeb

  • Traffic analytics
  • Audience insights
  • Competitor research
  • Industry analysis

Only in Stylus

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

SimilarWeb

  • Analyzing competitor advertising across display, search, socialnot Stylus
  • Understanding traffic loss to search and AI recommendationsnot Stylus
  • Tracking brand visibility across ChatGPT and AI chatbotsnot Stylus
  • Optimizing Amazon product placement with marketplace analyticsnot Stylus
  • Identifying high-intent prospects at optimal buying momentsnot Stylus

Stylus

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

Where each one falls short

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

SimilarWeb

  • Browser extension data accuracy is lower than full platform
  • Full platform pricing is not transparent and requires quote-based inquiry

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

Pricing, plan by plan

SimilarWeb

Free
  • FreeFree
    • Traffic overview
    • Engagement metrics
    • Similar sites

Stylus

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

Which should you pick?

Choose SimilarWeb if

  • You need traffic analytics.
  • You want to start without paying.
  • You work on Web, Browser Extension.
  • You also want audience insights.
SimilarWeb review

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

Questions people ask

Is SimilarWeb or Stylus better?
Neither clearly leads. SimilarWeb starts at Free and Stylus at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, SimilarWeb or Stylus?
SimilarWeb starts at Free and Stylus at Free.
Does SimilarWeb or Stylus run on more platforms?
SimilarWeb runs on Web, Browser Extension. Stylus runs on Chrome, Firefox, Edge, Opera.
Can I use SimilarWeb for free?
Both have a free tier, so you can try either at no cost before committing.
What is SimilarWeb best used for?
SimilarWeb is most often used for analyzing competitor advertising across display, search, social, understanding traffic loss to search and ai recommendations, tracking brand visibility across chatgpt and ai chatbots, optimizing amazon product placement with marketplace analytics. Of those, analyzing competitor advertising across display, search, social and understanding traffic loss to search and ai recommendations are not what Stylus is typically brought in for.
What can SimilarWeb do that Stylus cannot?
SimilarWeb covers Traffic analytics, Audience insights, Competitor research, Industry analysis. Stylus covers Custom CSS injection, Style management, userstyles.world integration, Built-in editor. Both handle Chrome support, Firefox support, Edge support.

Answered from the vendors’ own pages

SimilarWeb: How much does Similarweb cost?

Similarweb does not publish pricing. Custom packages are available for businesses and enterprises. Self-service options are available for entrepreneurs and small teams. Customers must start a free trial or contact sales to receive a quote.

Source
Stylus: Is Stylus free?

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

Source
SimilarWeb: Does Similarweb offer a free trial?

Yes. Similarweb offers free trials for its various products. Users can start a free trial through their registration page or contact support to switch between different product trials.

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
SimilarWeb: What products does Similarweb offer?

Similarweb offers the Competitive Intelligence Suite, Strategic SEO Suite, Ads Intelligence Suite, Gen AI Intelligence Suite, AI Studio with natural language queries, custom data feeds, API access, and managed services with custom dashboards.

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
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