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Browser Extensions · head to head

Dark Reader vs uBlock Origin

Dark Reader logo

Dark Reader

Browser Extensions

Dark mode for every website

From
Free
Rated
-
Full reviewWebsite
uBlock Origin logo

uBlock Origin

Browser Extensions

Free, open-source ad content blocker

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Dark Reader cannot modify PDF files displayed in browsers; uBlock Origin cNAME uncloaking of third-party trackers disguised as first-party is only available on Firefox, because the required DNS API does not exist in Chromium
  • They diverge on capability: Dark Reader covers Dark mode, uBlock Origin covers Ad blocking.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Dark Reader and uBlock Origin actually diverge.

Attributes where Dark Reader and uBlock Origin differ
AttributeDark ReaderuBlock Origin
Pricing modelUnknownfree
PlatformsChrome, Firefox, Safari, EdgeChrome, Firefox, Edge, Opera

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Browser Extensions), founded (2014).

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 Dark Reader

  • Dark mode
  • Custom brightness
  • Contrast adjustment
  • Site-specific settings
  • Safari support

Only in uBlock Origin

  • Ad blocking
  • Tracker blocking
  • Malware domain blocking
  • Custom filter lists
  • 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.

Dark Reader

  • Applying dark mode to websites that don't natively support itnot uBlock Origin
  • Reducing eye strain for night-time or extended browsingnot uBlock Origin
  • Per-site brightness, contrast, and sepia customizationnot uBlock Origin
  • Toggling dark mode on/off per domainnot uBlock Origin
  • Accessibility use for light-sensitive usersnot uBlock Origin

uBlock Origin

  • Ad and tracker blocking in web browsersnot Dark Reader
  • Privacy protection while browsing the webnot Dark Reader
  • Reducing bandwidth usage by blocking adsnot Dark Reader
  • Users seeking open-source browser extensionsnot Dark Reader

Where each one falls short

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

Dark Reader

  • Cannot modify PDF files displayed in browsers
  • Performance impact on devices with limited resources

uBlock Origin

  • CNAME uncloaking of third-party trackers disguised as first-party is only available on Firefox, because the required DNS API does not exist in Chromium
  • HTML filtering of response bodies requires the webRequest.filterResponseData API, which is only available in Firefox
  • On Chromium-based browsers uBO is not reliably ready at browser launch, so tracker and advertisement payloads can reach already-open tabs before filtering starts
  • Pre-fetch blocking is not reliable on Chromium-based browsers because they give websites precedence over user settings
  • The Chromium build does not use the WebAssembly filtering code paths, because the extra manifest permission would create friction publishing to the Chrome Web Store
  • LZ4 storage compression is Firefox only, and on Chromium in incognito mode IndexedDB resets, so uBO launches with out-of-date filter lists

Pricing, plan by plan

Dark Reader

Free

No published plan breakdown. See the Dark Reader review.

uBlock Origin

Free
  • FreeFree
    • Ad blocking
    • Tracker blocking
    • Custom filter lists

Which should you pick?

Choose Dark Reader if

  • You need dark mode.
  • You want to start without paying.
  • You work on Chrome, Firefox, Safari, Edge.
  • You also want custom brightness.
Dark Reader review

Choose uBlock Origin if

  • You need ad blocking.
  • You want to start without paying.
  • You work on Chrome, Firefox, Edge, Opera.
  • You also want tracker blocking.
uBlock Origin review

Questions people ask

Is Dark Reader or uBlock Origin better?
Neither clearly leads. Dark Reader starts at Free and uBlock Origin at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Dark Reader or uBlock Origin?
Dark Reader starts at Free and uBlock Origin at Free.
Does Dark Reader or uBlock Origin run on more platforms?
Dark Reader runs on Chrome, Firefox, Safari, Edge. uBlock Origin runs on Chrome, Firefox, Edge, Opera.
Can I use Dark Reader for free?
Both have a free tier, so you can try either at no cost before committing.
What is Dark Reader best used for?
Dark Reader is most often used for applying dark mode to websites that don't natively support it, reducing eye strain for night-time or extended browsing, per-site brightness, contrast, and sepia customization, toggling dark mode on/off per domain. Of those, applying dark mode to websites that don't natively support it and reducing eye strain for night-time or extended browsing are not what uBlock Origin is typically brought in for.
What can Dark Reader do that uBlock Origin cannot?
Dark Reader covers Dark mode, Custom brightness, Contrast adjustment, Site-specific settings. uBlock Origin covers Ad blocking, Tracker blocking, Malware domain blocking, Custom filter lists. Both handle Chrome support, Firefox support, Edge support.

Answered from the vendors’ own pages

Dark Reader: Is Dark Reader free to use?

Yes, Dark Reader is completely free with no ads and no tracking. It does not send user data anywhere.

Source
uBlock Origin: How much does uBlock Origin cost?

uBlock Origin is completely free and open-source software with no licensing fees, subscriptions, or commercial restrictions.

Source
Dark Reader: How can I customize the dark mode in Dark Reader?

Users can configure brightness, contrast, and sepia filter settings to suit their specific needs, and selectively enable or disable Dark Reader for specific websites.

Source
uBlock Origin: Is uBlock Origin open source?

Yes, uBlock Origin is distributed under the GPL-3.0 License with source code publicly available on GitHub. The project encourages community review and contribution.

Source
Dark Reader: What browsers does Dark Reader support?

Dark Reader is available for Chrome, Firefox, Safari, and Edge browsers across desktop and mobile platforms.

Source
uBlock Origin: Does uBlock Origin accept donations?

No, uBlock Origin explicitly does not accept donations. The project instead encourages users to support the developers maintaining the filter lists that power the extension.

Source
Dark Reader: Does Dark Reader work offline?

Yes, Dark Reader runs entirely on your device with no external dependencies. It analyzes web pages locally to generate dark themes.

Source
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