Semrush vs Similarweb (2026): Which Traffic and SEO Data Should You Trust?

People usually compare Semrush and Similarweb for one reason: they want to know how much traffic a competitor gets and where it comes from. Both companies sell that answer. But they come at it from opposite directions:

Semrush is an SEO platform first. Keyword research, rank tracking, site audits and backlinks are its core plans, and competitor traffic analysis is a separate Traffic & Market toolkit you add on.
Similarweb is a digital-market-intelligence platform first. Website traffic and engagement estimates are its core product, and SEO tools come bundled in its higher self-serve tiers.

This comparison uses only what each vendor publishes on its own pricing, plan and methodology pages, checked as of November 2026, with links to every source. Traffic numbers from both tools are estimates; neither replaces the analytics on a site you own.

Quick answer

Pick Semrush if SEO is the main job (keywords, rankings, audits, backlinks) and competitor traffic is a supporting question. Its SEO plans start at $139/mo, and its Traffic & Market toolkit adds traffic analysis with history it says goes back to 2017.
Pick Similarweb if understanding competitors' total traffic, audiences and marketing channels is the main job, and SEO is secondary. Its self-serve Competitive Intelligence plan starts at $199/mo (or $125/mo billed annually).
Need both serious SEO and serious traffic data? Price the bundles carefully: Similarweb's Competitive Intel & SEO & AEO plan ($333/mo annually) costs less than Semrush SEO plus Traffic & Market on annual billing, but Semrush gives you deeper SEO tooling and much longer traffic history.

How the two products are structured

Semrush: SEO plans plus an optional traffic toolkit

Semrush sells SEO + AI Search plans (SEO, Starter, Pro+ and Advanced) and lets you add specialist toolkits — Traffic & Market, Local, Content, Social, Advertising and AI PR — separately (Semrush subscriptions KB).

The Traffic & Market toolkit is the part that competes head-on with Similarweb. Semrush describes it as showing how any business performs online and how it compares to the market, combining traffic analysis, audience insights, benchmarking and market trends. Its Pro plan includes the Traffic Overview, Market Landscape, Acquisition Channel Mix, Top Pages & Conversions and Competitor Alerts reports, worldwide data and up to 100 competitors to analyze (Semrush Traffic & Market pricing). Semrush's knowledge base adds that the Pro plan covers trends across 190+ countries, daily traffic insights and historical data dating back to 2017 (Semrush subscriptions KB).

Similarweb: traffic intelligence first, SEO in the bundles

Similarweb's self-serve "Entrepreneurs" plans are tiered by how much beyond traffic you need (Similarweb pricing):

Competitive Intelligence — website performance, traffic and engagement, customer demographics, marketing channels overview and competitor alerts.
Competitive Intel & SEO & AEO — everything above plus SEO intelligence (organic search overview, keyword research, rank tracker, site audit and backlinks) and "AEO" (AI brand visibility with 150 tracked prompts, sentiment, citation analysis and AI traffic).
Competitive Intel, SEO & AEO & Ads — adds ad intelligence (creative and campaign insights, search and display insights, ad spend).

Larger companies are pointed to custom "Businesses & Enterprises" packages, which Similarweb says can add up to 37 months of data, 100+ country-level coverage, APIs, data feeds and MCP access.

Pricing side by side (as of Nov 2026)

Plan	Monthly billing	Billed annually (per month)	Source
Semrush SEO	$139	$117.33	Semrush
Semrush Starter (SEO + AI Search)	$199	$165.17	Semrush
Semrush Pro+	$299	$248.17	Semrush
Semrush Traffic & Market Pro	—	$289	Semrush
Similarweb Competitive Intelligence	$199	$125	Similarweb
Similarweb Competitive Intel & SEO & AEO	$399	$333	Similarweb
Similarweb Competitive Intel, SEO & AEO & Ads	$649	$542	Similarweb

The Semrush Traffic & Market page we checked listed the Pro plan as $289/mo billed annually; we did not record a separate monthly-billing price for it.

What common setups cost

SEO only: Semrush SEO at $139/mo is cheaper than any Similarweb plan that includes SEO tools ($399/mo monthly, $333/mo annually).
Traffic only: Similarweb Competitive Intelligence at $125/mo (annual) is less than Semrush Traffic & Market Pro at $289/mo (annual). But note the history: Similarweb's entry plan includes 3 months of historical data, while Semrush says Traffic & Market Pro goes back to 2017.
SEO plus traffic, annual billing: Semrush SEO ($117.33) + Traffic & Market Pro ($289) = $406.33/mo, versus Similarweb Competitive Intel & SEO & AEO at $333/mo. Similarweb is cheaper here; Semrush gives you a dedicated SEO suite and years more traffic history.

Where the data comes from

Because both tools estimate traffic for websites they do not own, methodology is the whole ballgame. Here is how each vendor describes its sources.

Semrush

Traffic & Market data comes from what Semrush calls a panel of over 200 million real, anonymized internet users in more than 190 countries and regions, built with hundreds of clickstream data providers. Semrush says it runs that clickstream data through a neural-network model that also uses its backlink and organic-position databases to estimate traffic and behavior (Semrush data article).
Keyword and ranking data comes from third-party providers that collect Google results pages for hundreds of millions of keywords, with the top 100 positions recorded.
Backlinks come from Semrush's own crawler.

Similarweb

Similarweb describes four kinds of input (Similarweb: Our Data):

Website and app owners: first-party analytics (for example Google Analytics) directly measured from millions of websites and apps that share data with Similarweb.
Contributor network: anonymous traffic data from Similarweb products installed on millions of devices.
Public data: publicly available information captured and indexed algorithmically.
Partnerships: pre-analyzed data from partners such as ISPs, measurement companies and corporate-intelligence firms.

Similarweb then synthesizes and models these signals into its traffic estimates.

What that means for you

Both vendors combine panel or clickstream data with modeling, and both add their own SEO data on top. Neither publishes an independent accuracy audit on these pages, and any estimate can be off for small sites or narrow niches where panel coverage is thin.

The practical test: during a free trial, look up two or three sites whose real numbers you know (your own sites, or a partner's with permission), and compare each tool's estimate with Google Analytics or Search Console. Whichever tool is closer for sites like yours is the one to trust for your competitors.

SEO depth

If SEO is your primary use case, the gap is large.

Semrush's core plans are built around SEO: Position Tracking with 500 keywords tracked daily on the SEO and Starter plans and 1,500 on Pro+, Site Audit, keyword research, competitor insights, and (on Pro+) historical SEO data, content optimization, keyword cannibalization analysis and multi-location/device tracking (Semrush pricing).

Similarweb's SEO bundle lists organic search overview, keyword research, a rank tracker, and site audit and backlinks (Similarweb pricing). Its public pricing page does not list tracked-keyword or audit limits for these plans, so check those in the trial before committing if rank tracking at scale matters to you.

AI search visibility

Both vendors now bundle AI-search tracking:

Semrush Starter includes 50 prompts tracked daily across Google Search, ChatGPT, Perplexity and Gemini, with 100 on Pro+ (Semrush subscriptions KB).
Similarweb Competitive Intel & SEO & AEO includes AI brand visibility with 150 tracked prompts, sentiment analysis, citation analysis and AI traffic (Similarweb pricing).

Free trials and free data

Semrush offers a 7-day free trial on its SEO + AI Search plans and on the Traffic & Market toolkit. Exports are disabled during trials, and each toolkit trial can be used once per account (Semrush subscriptions KB). There is also a free Semrush plan limited to 10 reports per day.
Similarweb offers free trials of its self-serve packages, and shows a high-level sample of data free on similarweb.com. It says premium features require a custom package (Similarweb pricing FAQ).

Because both offer trials, the best decision process is to run the same five or six competitor lookups in each and see which answers your actual questions.

Try Semrush free for 7 days

Users, billing and cancellation

Both vendors' entry plans include one user. Semrush sells additional users starting at $45/mo; Similarweb's self-serve plans list 1 user each.
Similarweb says self-serve customers can cancel from their subscription page and keep access until the end of the billing period; switching to annual billing requires contacting support. Business plans follow contract terms.
Semrush says you can cancel, downgrade or upgrade at any time unless you have custom contract terms (Semrush pricing FAQ).

Which should you choose?

Choose Semrush if…

You are an SEO, content marketer or site owner and rankings, keywords, audits and backlinks are the daily work.
You want competitor traffic as an add-on rather than the main product, with history back to 2017.
You may later want PPC, local, content or social toolkits in the same account.

See Semrush plans

Choose Similarweb if…

You are an analyst, founder, investor or growth marketer whose main questions are "how big is this competitor, where does its traffic come from, and who are its visitors?"
SEO is secondary, or you already have a dedicated SEO tool.
You are comfortable with 3–6 months of history on self-serve plans, or you are buying a custom business package.

FAQ

Is Similarweb more accurate than Semrush for traffic? Neither vendor publishes an independent accuracy benchmark on the pages we reviewed, and accuracy varies by site size and market. Test both against sites whose real analytics you can see.

Can Semrush replace Similarweb? For many SEO-led teams, Semrush with the Traffic & Market toolkit covers the competitor-traffic questions they ask. Teams that need ad intelligence, deep audience analysis or custom data feeds may still prefer Similarweb's packages.

Is there a Semrush coupon for Traffic & Market? We do not publish coupons. Semrush's official offer is a 7-day free trial on the toolkit.

Sources

All checked November 13, 2026:

Semrush, Plans & Pricing
Semrush, Traffic & Market pricing
Semrush Knowledge Base, Subscription plans & toolkits
Semrush Knowledge Base, Data and metrics
Similarweb, Web Intelligence plans and pricing
Similarweb, Our data