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2026-10-28 01:44 Tool comparisons

Semrush vs Similarweb (2027): SEO Suite or Market and Traffic Intelligence, Which One Does Your Startup Need?

Semrush vs Similarweb: SEO Suite or Market Intelligence, Which One Does Your Startup Need?

Semrush and Similarweb are often compared as if they were two SEO tools, but they answer different questions. Semrush is an SEO and AI search suite: it shows what people search for, how hard each keyword is, where your pages rank, what breaks on your site and whether ChatGPT and Gemini mention you. Similarweb is a market and traffic intelligence platform: it estimates how many visits any website gets, from which channels and countries, and how much now comes from AI chatbots. We checked both on their official pricing and feature pages in October 2026, so the plans and prices below are current, and we removed the outdated prices of the old version of this article.
Quick answer: if you want more visitors from Google and AI search, choose Semrush. Its free plan gives 10 reports a day, and the SEO plan costs €112.52 a month billed annually (€134 monthly). If you need to size a market, benchmark competitors' traffic or prepare an investor deck, choose Similarweb: its free traffic checker and browser extension cover the basics, and paid plans start at $125 a month billed annually ($199 monthly). Most early-stage startups need Semrush for daily SEO work and Similarweb's free tools for market research.
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Semrush vs Similarweb at a Glance

SemrushSimilarweb
What it isSEO and AI search visibility suiteDigital market intelligence: website, app and AI traffic
Main question it answersHow do I rank for the right keywords?Who wins the traffic in my market, and how?
Free optionFree plan: 1 demo project, 10 reports a day; free Website Traffic CheckerFree traffic checker, free keyword tool, browser extension with AI traffic
Paid plans (Oct 2026)SEO €134, Starter €190, Pro+ €286 a month; up to 17% less billed annually; Advanced customCompetitive Intelligence $199, plus SEO and AEO $399, plus Ads $649 a month; $125, $333 and $542 billed annually
Free trial7 days on paid plans7 days on self-service plans; the card is charged when it ends unless you cancel
Keyword researchKeyword Magic Tool: 28B+ keywords in 142 regional databasesIn the SEO and AEO plans: keyword research and keywords that send traffic to any site
Competitor trafficSeparate Traffic & Market toolkit, €277.15 a month billed annuallyThe core product, in every paid plan
AI searchStarter: 50 prompts tracked daily; Pro+: 100AI chatbot traffic in the free extension; 150 tracked prompts in the SEO and AEO plans
OwnershipAn Adobe company since April 2026Similarweb Ltd.
Sources: semrush.com pricing, Traffic & Market and Keyword Magic Tool pages, similarweb.com pricing, free tools and data pages, checked 27 and 28 October 2026. Semrush showed prices in euros from Europe; Similarweb lists US dollars.

The Two Tools Compared

Semrush: the SEO and AI Search Suite

Semrush is built for the work of ranking: keyword research, competitor keyword gaps, Position Tracking, Site Audit, backlinks and, on its newer plans, tracking how your brand appears in AI answers. Adobe completed its acquisition of Semrush in April 2026, and Semrush's customer FAQ dated 28 April 2026 says there are no immediate changes to services, features or billing. Everything is self-serve: the Semrush pricing page lists every plan, and you can start without a sales call.
  • Free plan: 1 demo project and 10 reports a day across the main tools, with AI Visibility features and no credit card.
  • SEO, €134 a month (€112.52 billed annually): 5 websites, 500 keywords tracked daily, basic keyword research and competitor analysis, Position Tracking, Site Audit and AI search monitoring.
  • Starter, €190 a month (€158.40 annually): the full keyword research and optimisation tools, competitor insights, MCP access for AI assistants and 50 AI prompts tracked daily.
  • Pro+, €286 a month (€238 annually): 15 websites, 1,500 tracked keywords, historical data, content optimisation, multi-location tracking and 100 AI prompts.
  • Advanced: custom price through a demo, with API data integration and team users. A 7-day free trial is available on the paid plans.
For keyword research, the Keyword Magic Tool draws on more than 28 billion keywords in 142 regional databases, so it also works for small markets and non-English sites. Our Semrush pricing guide and guide to free Semrush tools go deeper, and Semrush vs Long Tail Pro shows its long-tail keyword workflow.

Semrush Traffic & Market: Semrush's Answer to Similarweb

Semrush also sells competitor traffic data, but not in its SEO plans. The Traffic & Market toolkit is a separate subscription at €277.15 a month billed annually (shown from Europe in October 2026), with Traffic Overview, Market Landscape, Acquisition Channel Mix, Top Pages and Conversions, competitor alerts and AI insights for up to 100 competitors. On its market analysis page, Semrush says the toolkit is built on clickstream data from more than 200 million panelists in 190+ countries, with history back to 2017. For a quick check, its free Website Traffic Checker estimates monthly visits for any domain. Like Similarweb's numbers, these are estimates, not a competitor's real analytics.
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Similarweb: Market and Traffic Intelligence

Similarweb starts from traffic rather than keywords. Type in any domain and it estimates the site's visits, engagement, traffic sources (direct, organic and paid search, social, email, referrals, display), top countries and the keywords that bring it search traffic. You do not need access to a competitor's analytics, which is why founders use it for market sizing, competitor benchmarking and investor decks.
Similarweb says it combines four data sources: first-party analytics from websites and apps that connect their data, an anonymous contributors network, public data and data partners. The result is a modelled estimate: good for comparing sites and spotting trends, least reliable for very small websites.
  • Free tools: the website traffic checker (traffic, rankings, top keywords, referring domains and technologies for any domain), a free keyword tool for Google, YouTube and Amazon, and a browser extension that shows visits, traffic sources and how much traffic a site gets from ChatGPT, Gemini, Claude and Perplexity. Similarweb calls its free data a high-level sample.
  • Competitive Intelligence, $199 a month ($125 billed annually): 1 user, 3 months of history, traffic and engagement, customer demographics, marketing channels and competitor alerts.
  • Competitive Intel and SEO and AEO, $399 ($333 annually): 6 months of history, keyword research, rank tracker, site audit and backlinks, AI brand visibility and 150 tracked prompts.
  • Competitive Intel, SEO, AEO and Ads, $649 ($542 annually): adds paid search and ad intelligence.
  • Business and Enterprise: custom quotes with up to 37 months of history, 100+ countries, API, data feeds and MCP.
  • Trial: 7 days on the self-service plans; Similarweb's help centre says the card is charged automatically when the trial ends unless you cancel before then.
More on Similarweb's plans and free tools in our Similarweb vs Google Keyword Planner and Similarweb vs Keyword Insights comparisons.
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What Changed Since the Old Version of This Article

  • Semrush prices and trial: the old "plans start at $119.95 a month" and "2-week free trial" are out of date. The plans are now SEO, Starter, Pro+ and Advanced, and the trial is 7 days.
  • Semrush ownership: Semrush is now an Adobe company; Adobe completed the acquisition in April 2026.
  • Similarweb prices: the old version said Similarweb's pricing was only custom. It now publishes self-service plans from $125 a month billed annually, and keeps custom quotes for business packages.
  • Both moved into AI search: Semrush tracks AI prompts from Starter; Similarweb shows AI chatbot traffic for free and tracks prompts in its SEO and AEO plans.
  • Removed: links to third-party reviews and old screenshots from other sites, and general claims without an official source.

Semrush or Similarweb: Which Should You Choose?

  • You want more visitors from Google and AI search: Semrush. Start on the free plan, then run the 7-day trial of the SEO plan on your real site.
  • You are validating a market or writing an investor deck: Similarweb's free traffic checker first; Competitive Intelligence if you need history and demographics. Quote its figures as estimates.
  • You need both keywords and competitor traffic in one login: compare Semrush SEO plus Traffic & Market with Similarweb's Competitive Intel and SEO and AEO plan ($333 a month billed annually).
  • You want to know if ChatGPT and Gemini mention your startup: Semrush Starter (50 prompts) or Similarweb's SEO and AEO plan (150 prompts); the Similarweb extension shows AI traffic for free.
  • You have no budget: Semrush's free plan for keywords, Similarweb's free tools for competitors, and Google's own data from Keyword Tool vs Keyword Planner.
  • You are a large team: see Semrush vs BrightEdge for Semrush for Enterprise against an enterprise platform.
Comparing more SEO tools? See Moz vs SE Ranking, SE Ranking vs Mangools, SpyFu vs SE Ranking, Ahrefs vs Wincher, Ahrefs vs Semrush and Keyword Tool vs Keyworddit. On a budget, start with our free Ahrefs alternatives and open-source Ahrefs alternatives.

How Founders Use Semrush and Similarweb Together

  1. Map the market. Run three to five competitors through Similarweb's free traffic checker: who leads, how many visits they get and from which countries. Our list of traffic estimation tools has more options.
  2. Find the channels. Check whether competitors grow through search, social, referrals or AI chatbots, and put your effort where they are weakest.
  3. Pick your keywords. Use Semrush's free plan or Keyword Magic Tool for volume and difficulty; our guide to checking competitor keywords shows more ways.
  4. Track and fix. Track 20 to 50 keywords and a few AI prompts in Semrush, and fix what Site Audit flags first.
  5. Re-check each quarter. Compare your traffic share with the same competitors to see if the work pays off.
Traffic data is also cheap market research: if competitors get little traffic and nobody searches for the problem, validate your startup idea before you build. To put numbers on the market, try these free market size calculators, and compare more competitor analysis tools.
Once you know your keywords, the F/MS AI SEO Tool turns them into articles written to rank on Google and to be cited by ChatGPT and Perplexity, with human editors checking them; the AI SEO blog explains how AI search changes what to publish. For early links to a new site, F/MS Marketing Directories lists places where you can submit your startup.
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FAQ: Semrush vs Similarweb

What is the main difference between Semrush and Similarweb?

Semrush is an SEO suite: keyword research, rank tracking, site audits, backlinks and AI prompt tracking. Similarweb is a market intelligence platform that estimates any website's traffic, channels, countries and audience.

Is Semrush or Similarweb better for a startup?

For SEO, Semrush: it has a free plan, a 7-day trial and an SEO plan from €112.52 a month billed annually. For market research and competitor benchmarking, Similarweb, starting with its free tools.

How much does Similarweb cost?

When we checked in October 2026, self-service plans cost $199, $399 or $649 a month, or $125, $333 and $542 a month billed annually, each for one user. Business packages are quoted by sales.

How much does Semrush cost?

From Europe we saw SEO at €134 a month, Starter €190 and Pro+ €286, or up to 17% less billed annually. Advanced is priced on request, and the Traffic & Market toolkit is €277.15 a month billed annually.

Are there free versions?

Yes. Semrush has a free plan with 10 reports a day and a free Website Traffic Checker. Similarweb has a free traffic checker, a free keyword tool and a browser extension that shows AI chatbot traffic.

Where can I submit a guest post about my startup?

You can publish a guest post in one of the Fe/male Switch startup blogs, which rank in Google and in AI tools like ChatGPT and Perplexity. Get a quality backlink.

Does Semrush show competitor traffic like Similarweb?

Yes, through its separate Traffic & Market toolkit, which Semrush says is built on clickstream data from 200M+ panelists. Its free Website Traffic Checker gives a quick estimate.

How accurate is the traffic data?

Both tools give modelled estimates, not a competitor's real analytics. Use them to compare sites and spot trends; they are least reliable for very small websites.

Which tool tracks visibility in ChatGPT and other AI assistants?

Both. Semrush tracks 50 prompts on Starter and 100 on Pro+. Similarweb's SEO and AEO plans track 150 prompts, and its free extension shows traffic from AI chatbots.

Did Adobe buy Semrush?

Yes. Adobe completed the acquisition in April 2026, and Semrush told customers there would be no immediate changes to their services or billing.

About the Author

Violetta Bonenkamp, also known as MeanCEO, is an experienced startup founder with an impressive educational background including an MBA and four other higher education degrees. She has over 20 years of work experience across multiple countries, including 5 years as a solopreneur and serial entrepreneur. Throughout her startup experience she has applied for multiple startup grants at the EU level, in the Netherlands and Malta, and her startups received quite a few of those. She’s been living, studying and working in many countries around the globe and her extensive multicultural experience has influenced her immensely.