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Browser Extensions · head to head

uBlock Origin vs Web Developer

uBlock Origin logo

uBlock Origin

Browser Extensions

Free, open-source ad content blocker

From
Free
Rated
-
Full reviewWebsite
Web Developer logo

Web Developer

Browser Extensions

Web developer toolbar for browsers

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: 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; Web Developer the Web Developer browser extension is licensed GPL-3.0 per its GitHub repository (github.com/chrispederick/web-developer), which states 'All files are distributed for free under the terms of the GNU General Public License,' confirming it has no vendor pricing model to compare.
  • They diverge on capability: uBlock Origin covers Ad blocking, Web Developer covers CSS inspection.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which uBlock Origin and Web Developer actually diverge.

Attributes where uBlock Origin and Web Developer differ
AttributeuBlock OriginWeb Developer
Founded20142003

Identical on both: starting price (Free), pricing model (free), free tier (Yes), platforms (Chrome, Firefox, Edge, Opera), 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 uBlock Origin

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

Only in Web Developer

  • CSS inspection
  • Form debugging
  • Image analysis
  • Element outlining

Both cover

  • Chrome support
  • Firefox support
  • Edge support
  • Opera support

What people use each for

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

uBlock Origin

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

Web Developer

No use cases recorded yet. See the Web Developer review.

Where each one falls short

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

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

Web Developer

  • The Web Developer browser extension is licensed GPL-3.0 per its GitHub repository (github.com/chrispederick/web-developer), which states 'All files are distributed for free under the terms of the GNU General Public License,' confirming it has no vendor pricing model to compare.

Pricing, plan by plan

uBlock Origin

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

Web Developer

Free
  • FreeFree
    • CSS tools
    • Form tools
    • Image tools

Which should you pick?

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

Choose Web Developer if

  • You need css inspection.
  • You want to start without paying.
  • You work on Chrome, Firefox, Edge, Opera.
  • You also want form debugging.
Web Developer review

Questions people ask

Is uBlock Origin or Web Developer better?
Neither clearly leads. uBlock Origin starts at Free and Web Developer at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, uBlock Origin or Web Developer?
uBlock Origin starts at Free and Web Developer at Free.
Does uBlock Origin or Web Developer run on more platforms?
Both run on Chrome, Firefox, Edge, Opera, so platform support will not decide this one for you.
Can I use uBlock Origin for free?
Both have a free tier, so you can try either at no cost before committing.
What is uBlock Origin best used for?
uBlock Origin is most often used for ad and tracker blocking in web browsers, privacy protection while browsing the web, reducing bandwidth usage by blocking ads, users seeking open-source browser extensions. Of those, ad and tracker blocking in web browsers and privacy protection while browsing the web are not what Web Developer is typically brought in for.
What can uBlock Origin do that Web Developer cannot?
uBlock Origin covers Ad blocking, Tracker blocking, Malware domain blocking, Custom filter lists. Web Developer covers CSS inspection, Form debugging, Image analysis, Element outlining. Both handle Chrome support, Firefox support, Edge support, Opera support.

Answered from the vendors’ own pages

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
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
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
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