Browser Extensions · head to head
SimilarWeb vs AdBlock Plus
SimilarWeb
Browser Extensions
Website traffic and competitive analysis
- From
- Free
- Rated
- -
The short version
- Each has a real cost: SimilarWeb browser extension data accuracy is lower than full platform; AdBlock Plus acceptable Ads allowlist model generates controversy over ad filtering conflicts of interest
- They diverge on capability: SimilarWeb covers Traffic analytics, AdBlock Plus covers Ad blocking.
Where they differ
Only the attributes on which SimilarWeb and AdBlock Plus actually diverge.
| Attribute | SimilarWeb | AdBlock Plus |
|---|---|---|
| Pricing model | freemium | free |
| Platforms | Web, Browser Extension | Chrome, Edge, Firefox, Opera, Safari, Yandex Browser |
| Founded | 2007 | 2006 |
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 AdBlock Plus
- Ad blocking
- Acceptable Ads
- Custom filters
- Social media blocking
- Safari support
- Opera support
Both cover
- Chrome support
- Firefox support
- Edge support
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
AdBlock Plus
- Acceptable Ads allowlist model generates controversy over ad filtering conflicts of interest
- Smaller feature set compared to open-source alternatives like uBlock Origin
- Less customization and dynamic filtering compared to uBlock Origin
- Mobile version less comprehensive than desktop extension
- Chrome version increasingly limited due to Manifest V3 migration
Pricing, plan by plan
SimilarWeb
Free- FreeFree
- Traffic overview
- Engagement metrics
- Similar sites
AdBlock Plus
Free- FreeFree
- Ad blocking
- Acceptable Ads option
- Custom filters
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.
Choose AdBlock Plus if
- You need ad blocking.
- You want to start without paying.
- You work on Chrome, Edge, Firefox, Opera, Safari, Yandex Browser.
- You also want acceptable ads.
Questions people ask
- Is SimilarWeb or AdBlock Plus better?
- Neither clearly leads. SimilarWeb starts at Free and AdBlock Plus at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, SimilarWeb or AdBlock Plus?
- SimilarWeb starts at Free and AdBlock Plus at Free.
- Does SimilarWeb or AdBlock Plus run on more platforms?
- SimilarWeb runs on Web, Browser Extension. AdBlock Plus runs on Chrome, Edge, Firefox, Opera, Safari, Yandex Browser.
- Can I use SimilarWeb for free?
- Both have a free tier, so you can try either at no cost before committing.
- What can SimilarWeb do that AdBlock Plus cannot?
- SimilarWeb covers Traffic analytics, Audience insights, Competitor research, Industry analysis. AdBlock Plus covers Ad blocking, Acceptable Ads, Custom filters, Social media blocking. Both handle Chrome support, Firefox support, Edge support.
Answered from the vendors’ own pages
SimilarWeb: Is the SimilarWeb browser extension free?
Yes. The SimilarWeb browser extension is completely free to install and use with no paid tiers and no credit card required.
SourceAdBlock Plus: What does Adblock Plus block?
Adblock Plus blocks banner ads, pre-roll and mid-roll video ads on YouTube, pop-ups, sidebar ads, and most standard display formats. With Acceptable Ads disabled and EasyPrivacy enabled, it achieved a 100/100 score on AdBlock Tester in April 2026.
SourceSimilarWeb: How many websites does SimilarWeb cover?
SimilarWeb provides access to intelligence from 1B+ websites and 8M apps, tracks 5B search terms and 250M display ads across 190 countries and 210 industries.
SourceAdBlock Plus: What browsers does Adblock Plus support?
Adblock Plus is available for Chrome, Edge, Firefox, Opera, Safari, and Yandex Browser.
SourceSimilarWeb: How accurate is SimilarWeb extension data?
Browser extension data accuracy is lower than the full platform, but it is adequate for ballpark figures of traffic estimates.
SourceAdBlock Plus: Is there a premium version of Adblock Plus?
Yes. Adblock Plus Premium costs $40 annually or $4 per month and allows users to block cookie consent pop-ups, while the free version includes core ad blocking.
SourceAdBlock Plus: What is Acceptable Ads?
Acceptable Ads is an opt-in setting that allows advertising Adblock Plus deems unobtrusive to display on websites; it is disabled by default but can be toggled in Settings.