Semrush vs Similarweb
Semrush
Best for competitor research
The search specialist. Its included traffic figure is a forecast from rankings, and its clickstream data is a second subscription.
$117.33 / mo
SEO plan, annual billing
Similarweb
Best modelled traffic at scale
The whole-market traffic model, with SEO tools two plans up. Cheaper for traffic, much shallower on history at entry.
$125 / mo
Competitive Intelligence, annual billing
$117.33 a month against $125 looks like a close call between two research tools. It is not. The two entry plans do not contain the same kind of traffic number. Semrush's SEO plan estimates what a site could earn from its rankings. Similarweb's entry plan models visits across every channel.
Choose Semrush when search is the channel your decision turns on: tracked keywords, audits and a competitor's organic footprint. Choose Similarweb when the question is how big a competitor is. That means direct, referral, social and paid, with search as one line among several.
If you need both views in one seat, the arithmetic favours Similarweb. Its plan is $333 a month. Semrush's SEO plan plus its separate Traffic & Market toolkit is $406.33. The exception is history: Similarweb's self-serve plans hold three or six months, and Semrush's toolkit goes back to 2017.
Whichever you trial, test it on a domain whose analytics you can see. Read every figure as a model. Similarweb's help centre says as much, and Semrush tells you to use Google Analytics for your own site.
- 01Semrush's SEO plans estimate traffic from rankings, search volume and click-through rate. Semrush calls it what a site could get.
- 02Semrush's clickstream estimate is a separate Traffic & Market toolkit at $289 a month billed annually. No SEO plan includes it.
- 03Similarweb's $125 entry plan models visits across every channel, with three months of history and no SEO tools.
- 04SEO tooling plus cross-channel traffic in one seat costs $333 on Similarweb and $406.33 on the Semrush stack, 22% more.
- 05Only Similarweb publishes where its estimates weaken: most confident above 100,000 monthly visits, and blank under 5,000.
Semrush vs Similarweb reads like a choice between two competitor research tools at similar prices. The entry plans are $7.67 a month apart. Type in a competitor's domain, though, and they return different kinds of number. That difference is the decision this page is built around.
Semrush's help centre is unusually direct about its own figure. The traffic in its domain reports is keyword positions multiplied by search volume and average click-through rate. Semrush calls it how much traffic a site could get from search. It leaves out direct, referral and social visits.
Similarweb's figure is a model of visits across every channel. It blends analytics that sites share with it, data from its own consumer products, partner data and public web data. Semrush sells a model of that kind too. It is a separate toolkit, and none of Semrush's SEO plans include it.
So the first question is which number your work needs. A content lead sizing a competitor's search footprint wants the first kind. A strategist asking how big a rival is, and where its visitors come from, wants the second. Buying the wrong one is how a board slide ends up quoting a search forecast as total traffic.
That mistake is easy to make because both tools print the word traffic above both numbers. Neither label says which model produced it. The sections below show where each figure comes from, what each costs, and where each one stops being worth reading.
Every price below is the US price in dollars. Each was read from the vendor's own pricing page through a US connection on 17 September 2026. Facts from a help centre or developer docs say so. Nothing is converted from another currency, and a price a vendor does not publish is marked as missing.
Semrush vs Similarweb, side by side
Every value in the first block comes from the same record that drives the directory listing, so this table cannot disagree with the cards. Accented tags are capabilities one side has and the other does not.
The same workload, priced both ways
Seven workloads, each priced at the plan it actually requires. Most comparisons of these two set the entry plans against each other, which misleads because they buy different data. Three things decide what you pay: which traffic number you need, whether you also need SEO tools, and how much history the work has to show.
Plan prices are US prices in USD, annual billing unless stated. They were read on 17 September 2026 through a US connection from semrush.com/pricing/, semrush.com/pricing/traffic-and-market/, semrush.com/pricing/advertising/ and similarweb.com/packages/web/. Semrush's toolkit pages render annual prices only. Neither vendor publishes a price for API access to its traffic data, so the last row says so instead of estimating.
Every price here is what each vendor shows a buyer in the US. Semrush prices by region. Similarweb's pricing page code carries a regional pricing test for four other countries. A buyer elsewhere may therefore see different figures and a different gap. Nothing here is converted at an exchange rate, because a converted price is not one either vendor charges.
Where the pricing page and the invoice come apart
Not a list of limitations, which every comparison already carries. These are the five places where the published price is not the price you end up paying.
- Semrush
Semrush's clickstream traffic is a second subscription, not a higher tier
None of the four SEO plans includes the Traffic & Market toolkit, not even Advanced at $455.67. It is sold on its own at $289 a month billed annually. So a Semrush customer who wants the kind of number Similarweb returns is buying a second product. Compare the combined invoice, not either line alone.
- Semrush
The Traffic & Market price is labelled two different ways
The pricing page renders $289 a month billed annually and shows no month-to-month figure. Semrush's own knowledge base lists the same Pro plan as "$289/monthly". Until sales confirms which applies to you, budget it as an annual commitment of $3,468. Do not plan on stopping it after one project.
- Semrush
A second Traffic & Market seat costs as much as the first
The toolkit includes one user. The pricing page says to contact Semrush for more. The knowledge base prices each extra Traffic & Market user from $289 a month, or $309 without the SEO Toolkit. The seven-day free access Semrush gives added users also excludes this toolkit. For a three-person research team, the seat line can outgrow the plan.
- Similarweb
Similarweb's $125 is an annual rate, and switching needs a ticket
Month to month, the entry plan is $199, which is 59% more. The two plans above it differ by only 16.5% between billing terms, so the entry discount is unusually steep. Similarweb's pricing FAQ also says moving to annual billing means opening a support ticket. If you plan to trial monthly and commit later, budget $199.
- Similarweb
The self-serve cards do not say which countries you get
Similarweb's help centre says each country filter must be in your package. Worldwide is the one exception that every plan can run. The three self-serve cards list features, seats and history, and say nothing about countries. If your research covers one market, such as the US alone, confirm the filter during the trial. Do it before you pay for a year.
Semrush's included traffic number is a forecast from rankings
Semrush's knowledge base explains why two of its reports show different traffic for the same site. The domain report is estimated "based solely on keyword positions and their estimated traffic". That estimated traffic is search volume multiplied by average click-through rate.
Semrush calls the result how much traffic a website could get from its organic and paid positions. It does not count direct, referral or social visits. Semrush says that makes it less accurate for comparing total traffic between sites, and recommends it for comparing search reach instead.
Used for that job, it is a good number. It shows which terms carry a competitor's search visibility and which way that visibility is moving. It cannot show how big the competitor is. A brand with strong direct and referral traffic looks small in it.
It also inherits every assumption in the click-through curve. A ranking in a result full of ads and AI answers earns fewer clicks than the same ranking on a plain page. A curve averaged across the market cannot know which kind of page your competitor ranks on.
In a March 2026 r/SEO thread about estimating traffic, one commenter checked two of their own sites. Semrush's organic estimate came to about two thirds of the real figure on one. On the other it was just over half. Two sites prove nothing, but the direction fits the mechanism.
Ask which number you are reading. On a Semrush SEO plan it is a search forecast. Put it in a deck as total traffic, and you understate every competitor whose visitors arrive another way.
What sits underneath each visit model
Semrush's Traffic & Market toolkit is built from clickstream data, from proprietary and third-party sources. Its help centre describes a panel of providers that delivers data every one or two days. The panel draws on over a hundred apps and browser extensions.
A machine learning model then removes anomalies. Semrush checks the result against its own backlink and search position databases, and normalises it for each country, device and industry.
Similarweb describes four inputs. Millions of sites share their first-party analytics with it, some publicly and some privately. Its own consumer products contribute anonymous device data. Partners, including internet providers and measurement companies, add more. A crawler indexes public web data on top.
The difference that matters is the anchor. Similarweb's model includes real analytics from sites that choose to connect them, so it has measured data to calibrate against. Semrush's description does not mention first-party analytics. It anchors to its search databases instead. Neither vendor publishes how much weight each input carries.
So the fair expectation is this. Semrush's model should be at its most informed where search drives the traffic. Similarweb's should be strongest where visitors arrive through many doors. That is inference from the published methods, not a test result, and your own trial is the test.
Pick one competitor whose traffic is mostly search and one whose traffic mostly is not. If both tools rank the pair the same way, the choice is about price. If they disagree, the method matters for your market.
Only one of them says where its estimates stop working
Similarweb publishes its limits in plain terms. Its help centre is more confident in estimates for sites above 100,000 monthly visits. The platform shows no data for a site whose latest month is under 5,000 visits. Some features use desktop data only, so they go blank sooner.
Semrush publishes no equivalent threshold for Traffic & Market. That is not evidence its small-site estimates are better. A panel is a sample, and any sample thins out on small sites. It means you find the point where the numbers stop being useful yourself.
Both vendors put comparability ahead of accuracy, in their own words. Semrush says every figure in the toolkit is comparable between sites in percentage terms. Similarweb says it measures every site in one consistent way. It adds that there is no single source of truth, even between two analytics tools.
Practitioners land in the same place. The top-voted answer in that r/SEO thread says no third-party tool gives reliable traffic estimates. The practical reading is to use either tool to rank competitors against each other. Keep absolute figures out of anything that gets budgeted.
If most of your competitors get under 5,000 visits a month, Similarweb will show blanks. Semrush will show numbers nobody has vouched for. Neither is a reason to buy.
Three months of history cannot show a season
This is the row that flips the price argument. Similarweb's $125 plan carries three months of history. The $333 and $542 plans carry six. Up to 37 months is a Business feature, priced by quote.
Semrush's help centre lists Traffic & Market history back to 2017 on the $289 plan. The same plan carries daily traffic insights, 190 or more countries and up to 100 competitors. Similarweb lists daily-level data among its Business features.
Market research usually needs a year-on-year view. Six months cannot separate a competitor's growth from its busy season. Three cannot show a season at all. For a retailer, a travel brand or anyone with a sales calendar, the cheaper Similarweb plans are snapshot tools, not trend tools.
So for trend work, the real choice is $289 a month on Semrush against a Similarweb Business quote. Similarweb publishes no Business price, so that comparison cannot be finished from its website. If the quote comes back above $289, Semrush's toolkit is the cheaper route to multi-year history.
Write down the oldest month your analysis has to show. If it is more than six months back, the $125 and $333 Similarweb plans are out, whatever they cost.
Search depth or the whole market, rarely both at the entry price
Semrush's plans are built around search. Even the $117.33 SEO plan tracks 500 keywords a day and includes a site audit. Advanced reaches 5,000 keywords. What the plans leave out is the cross-channel picture, which costs another $289.
Similarweb's entry plan is the reverse. It covers website performance, engagement, demographics, the channel split and competitor alerts, with no SEO tools. Keyword research, a rank tracker, a site audit and backlinks arrive on the $333 plan. Similarweb says that plan is backed by real user data. Its card does not state how many keywords the rank tracker follows.
In my experience, a Semrush vs Similarweb comparison usually ends with each team owning the tool for its own question. A content lead mostly needs the search side. A strategy or insight lead mostly needs the market side.
AI referral traffic is the one line both now carry. Semrush's Traffic & Market toolkit breaks out an AI Traffic channel, covering visits from assistants such as chatgpt.com, claude.ai and gemini.google.com. Similarweb adds AI Traffic on its $333 plan. Both count the click, not the answer, so a brand an assistant cites without a link is invisible to both.
When one person genuinely needs both, the single-seat arithmetic favours Similarweb by $73.33 a month. The Semrush stack still wins on stated keyword allowances and on history. The cheaper stack is not automatically the better one.
Ask whether the work ends in a list of keywords or a share of a market. Keywords point to Semrush. Market share points to Similarweb. Both, for one person, points to the $333 plan and a trial of its rank tracker.
Piping traffic estimates elsewhere means a sales call on both sides
Semrush's Advanced plan lists API data integration. That is the standard API for search data. Traffic estimates come through the separate Trends API, and no price for it is published.
The Trends API has two plans. Basic returns visits, unique visitors, pages per visit, visit duration, the device split and bounce rate. Traffic sources, geographic distribution and daily traffic sit among the sixteen extra data types in Premium, which is sold through sales.
The developer docs say Basic can be bought from the Traffic & Market page. Yet that toolkit's pricing page lists one Pro plan and no API. Its knowledge base puts API access on a Custom plan.
Semrush's MCP server comes with Starter at $165.17, with 50,000 units that refresh on renewal. That access covers SEO data. For Traffic & Market data through MCP, Semrush's own documentation says you need a Trends API plan.
Similarweb sells its API inside Business packages or as a standalone API-only package, both quoted. It does publish a credit rate for every endpoint, so you can size a query before the call. Its MCP server needs the same API access.
Similarweb's docs charge one credit per metric per result for traffic and engagement. Three metrics over three months in one country is nine credits. Daily granularity multiplies that by roughly thirty, so choose monthly unless daily is the point.
Pick each one when
Semrush
- Search is the channel the decision turns on, and you need a stated daily keyword allowance.
- You need a competitor's traffic trend across several years without talking to sales first.
- Your team already works in Semrush, and adding one toolkit beats adding a vendor.
Similarweb
- You need a competitor's total traffic and channel mix, and three months of history is enough.
- One analyst needs SEO tools and cross-channel traffic in a single seat.
- Your competitors are large sites, which is where Similarweb says its estimates are strongest.
How this plays out once it is running
Start the Similarweb vs Semrush decision by writing down the question the numbers must answer. "Which topics carry this competitor's organic growth" is a search question. Semrush's SEO plan answers it for $117.33. "How big is this competitor, and where do its visitors come from" is a market question. Similarweb answers it for $125.
Then write down the oldest month the answer has to reach. If it is more than six months back, Similarweb's self-serve plans cannot show it. The choice becomes Semrush's toolkit at $289 against a Similarweb Business quote.
The third question is how many people need a login. Both traffic products include one. Semrush's help centre prices extra Traffic & Market users from $289 each. Similarweb's self-serve cards publish no add-on price at all. A team of three should get both answers in writing before the trial ends.
The fourth is where the data has to go. If it stays in the interface, both tools are self-serve. If it has to reach a warehouse, a dashboard or an assistant, both routes run through sales, and the budget line is unknown until the quote arrives.
The pattern I see most often is a content team quoting Semrush's domain traffic as total traffic. Someone holding a Similarweb screenshot then contradicts them. Semrush vs Similarweb, for that team, is not a vendor question. It is two estimates of two different things, both labelled traffic.
The counter-case is a team that only competes in search. For them, the channel split is interesting and rarely actionable. The extra $289, or the $333 plan, buys context they will not use. I would buy the Semrush SEO plan and check a competitor's overall size on Similarweb's free public pages first.
What neither Semrush nor Similarweb does
- Neither shows an error range beside a figure. Similarweb says where its confidence improves and where its data stops. Semrush says neither. Both print a modelled visit count in the same type as a measured one.
- Neither tells you whether a competitor's traffic is profitable. A channel chart shows that paid search doubled. It does not show the margin, the offer or the conversion rate, so a rising line can be a rival buying a loss.
- Neither sees demand that never becomes a visit. An AI answer that settles the question does not show up. Nor does a recommendation in a private chat, or a link forwarded inside a company. All of them shape a market.
- Neither covers small competitors well enough to rank them. Similarweb goes blank under 5,000 monthly visits. Semrush does not say where its model thins out. Most niche markets are full of sites below both lines.
- Neither turns a share-of-traffic chart into a content plan. Both show who is winning attention. Deciding what to publish, for whom and through which channel is a separate job, and it is the one that moves the number.
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FAQ
Frequently asked
Whose traffic estimates are more accurate, Similarweb's or Semrush's?
Neither is a measurement, and neither vendor claims otherwise. They model different things at entry. Semrush's SEO plans forecast search traffic from rankings, while Similarweb models visits across channels. Similarweb says it is most confident above 100,000 monthly visits. Whether you pick Semrush or Similarweb, test the estimate against a site whose analytics you can see.Does a Semrush SEO plan include Traffic Analytics?
No. Traffic Analytics is part of the Traffic & Market toolkit, sold separately at $289 a month billed annually. That is the US price read on 17 September 2026. The traffic figure in the SEO plans comes from Domain Analytics. Semrush describes it as keyword positions multiplied by search volume and average click-through rate, with no direct, referral or social visits.How much does Similarweb cost per month in the US?
The self-serve plans are $125, $333 and $542 a month billed annually. Month to month they are $199, $399 and $649. Business packages and the API are quoted. Set Semrush pricing vs Similarweb pricing side by side and the entry plans sit $7.67 apart. That gap hides the fact that they buy different kinds of traffic data.Why does Semrush show different traffic in Domain Overview and Traffic Analytics?
Because they are different models. Semrush's knowledge base says the domain figure comes only from keyword positions and their estimated traffic. Traffic Analytics comes from clickstream data covering every channel. Semrush adds that the two will almost always differ. It recommends the Traffic Analytics figure for comparing total traffic between sites.How far back does Similarweb's traffic history go?
Three months on the $125 Competitive Intelligence plan, and six on the $333 and $542 plans. Business packages can extend it to 37 months, priced by quote. For comparison, Semrush lists Traffic & Market history back to 2017 on its $289 plan. That matters for any analysis that has to separate growth from seasonality.Can Similarweb replace Semrush for keyword research and rank tracking?
Partly. Similarweb's $333 plan adds keyword research, a rank tracker, a site audit and backlinks, which Similarweb says are backed by real user data. The plan cards do not say how many keywords the rank tracker follows. Semrush states 500 a day on its SEO plan and 5,000 on Advanced. Run your own keyword list through the trial before switching.Does Similarweb use Google Analytics data in its estimates?
Yes, as one input. Similarweb says millions of sites share their first-party analytics with it. Site owners can connect Google Analytics publicly or privately. Similarweb blends that with data from its own consumer products, partners and the public web. Semrush describes its Traffic & Market data as proprietary and third-party clickstream, checked against its own search databases.Can I pull Semrush Traffic & Market data into a warehouse or an AI assistant?
Only through the Trends API, which has no published price. Basic returns visits, engagement and the device split. Traffic sources, geography and daily data need Premium, which is sold through sales. Semrush's MCP server needs a Trends API plan for this data too. Similarweb's API is also quoted, but it publishes a credit rate for every endpoint.What does a second user cost on Semrush Traffic & Market and on Similarweb?
Semrush's pricing page says to contact sales. Its knowledge base prices each extra Traffic & Market user from $289 a month, or $309 without the SEO Toolkit. Similarweb's self-serve plans each list one user and publish no add-on seat price. Get both figures in writing before a team trial ends, because the seat line can exceed the plan.Are Semrush and Similarweb stable vendors to sign a year with?
Adobe completed its acquisition of Semrush on 28 April 2026. Similarweb remains independent and listed, and on 13 May 2026 it announced a CEO succession planning process. As of 17 September 2026, neither event is a reason to avoid either vendor. Both are reasons to prefer a term you can leave, and an integration you can repoint.