Similarweb
Similarweb is a digital intelligence tool that estimates website traffic and keyword demand. I use it to benchmark competitors and spot channel trends — but I never treat its numbers as gospel.
The short verdict
- Use Similarweb for competitor traffic source analysis — it's the best use case.
- Cross-check keyword estimates with first-party data before making decisions.
- The Chrome extension is a time-saver for quick site checks.
- Don't pay for Pro unless you're doing heavy competitive research or market analysis.
You'll get the most out of Similarweb if you treat it like a scout report — not a financial statement.
What I'd actually use it for
Competitor benchmarking, mostly. I'll plug in a domain and see which channels drive their traffic — organic search, paid, social, referrals, direct. That tells me where they're investing and where I might have an opening.
I also use it for quick keyword checks. Not as my primary keyword tool — that's still Search Console and a rank tracker — but to see which keywords a competitor seems to be getting traffic from. It's directional.
The Chrome extension is handy for spot checks. I'm researching a site, I click the icon, and I get a traffic estimate and top keywords without leaving the page. Saves time.
What it's good at
Traffic source breakdown. Similarweb's channel attribution is surprisingly useful for understanding a competitor's strategy. If I see a site getting 40% of its traffic from paid search, that tells me something about their budget and priorities.
Trends over time. The ability to compare traffic trends across multiple domains is solid. I've used it to track how a competitor's organic traffic changed after a Google update.
Market analysis. For broader research — like sizing up a niche or identifying acquisition targets — Similarweb's market reports give you a decent overview.
What it's awkward for
Accuracy. This is the big one. Similarweb's data is modeled from panel data, ISP data, and other signals. It's not your Google Analytics. I've seen estimates that were off by 2x or more for smaller sites. For large, high-traffic domains, it's closer — but still not exact.
Keyword data is thin. Compared to Ahrefs or Semrush, Similarweb's keyword database feels shallow. You won't find long-tail gems here. It's more for spotting broad trends.
Site audit features. Similarweb has SEO audit tools, but I've never found them compelling. They're not as deep as dedicated tools like Screaming Frog or Sitebulb.
Pricing. The free tier is limited. Pro plans start around $200/month, which is competitive with Semrush and Ahrefs, but you get less keyword data for that price.
Tradeoffs and second-guesses
I've gone back and forth on whether to pay for Similarweb. For competitive intelligence, it's genuinely useful. But I already pay for Ahrefs, which overlaps on keyword research. The question is: do I need the traffic source data enough to justify another subscription?
For now, I use the free tier and the Chrome extension. If I were doing heavy market research — like analyzing a dozen competitors for a new vertical — I'd consider the Pro plan for a month.
Another tradeoff: Similarweb's data is US-centric. International traffic estimates are less reliable. If your competitors are global, take the numbers with extra salt.
Next step
Quick answers
Is Similarweb accurate?
Not for exact numbers. It's modeled data — great for trends and benchmarks, but don't build a strategy on a single traffic figure. Always compare with your own analytics.
Can I use Similarweb for free?
Yes, the free tier gives you basic traffic estimates and the Chrome extension. Pro plans unlock deeper data and more competitors.
How does Similarweb compare to Google Analytics?
They're different tools. GA is your own first-party data. Similarweb is third-party estimates for anyone's site. Use both, but don't mix them up.
Sources
Primary documentation is linked directly. Anything commercial is marked nofollow.
- Similarweb Keyword Analysis — Primary source for keyword analysis features.
- Similarweb Chrome Extension — Extension capabilities and limitations.
- Similarweb SEO Tools — Shows Similarweb's SEO positioning.
- Google Search Central — Authoritative SEO reference for grounding estimates.
Notes from Callum Bennett.