Semrush vs Ahrefs: what actually differs, and how to choose

The "Semrush or Ahrefs" argument is usually held at the level of feature lists, which is a useless level: the lists almost match. Both do keywords, links, audits, rank tracking and reports. The difference sits underneath, in where each gets its data, and it decides which questions a tool answers precisely and which it merely answers plausibly.

The short version

• Ahrefs is stronger where you need a link profile and reconnaissance on other people's sites. Its own crawler, its own link index.
• Semrush is stronger where you need the whole marketing picture: organic plus paid, content, social, and client-facing reporting.
• One subscription, and the work is classic SEO weighted towards links, take Ahrefs. Agency work where you report on the whole channel, take Semrush.

The real difference: where the data comes from

Ahrefs is built around its own web crawler and its own link index. The company crawls the web itself and stores what it found. That gives it its character: link numbers are fresh and deep, and anything a crawler cannot reach is an estimate.

Semrush is built around aggregation: its own data plus purchased data, plus models that reconstruct traffic and ad spend. That gives it its character: very broad channel coverage, including paid search where a crawler gets you nowhere, but the numbers are more often computed than observed.

The practical consequence matters more than any feature table. When Ahrefs reports 4,132 referring domains, it is telling you what it saw. When Semrush reports 87,400 monthly visits for a competitor, it is telling you what it estimated. Both are useful, and they deserve different handling.

That gives two verification habits worth adopting before a number reaches a slide.

Observed data is checked by sampling. Take twenty random links from the report, open them by hand, and count how many are live and genuinely point where the report says. Fifteen out of twenty is workable accuracy; five is a reason to stop trusting the whole report.

Estimated data is checked against your own site. Look at what the platform estimates for a domain you know from the inside and compare it with your analytics. The ratio you get is the thing to apply to competitors. The absolute figure on its own means less than it appears to.

The most common mistake when running both platforms is comparing their numbers against each other to work out which one is right. They measure different things by different methods. A twofold gap in traffic estimates is normal, not evidence that one of them is broken.

Link profiles

This is Ahrefs' territory, and the gap is at its widest here.

What differs in practice: how quickly a new link shows up in a report, how much history is kept on lost links, and how workable the anchor breakdown is. Ahrefs has historically surfaced new links faster and kept a fuller record of their life, which matters when reclaiming lost links and when working out where a competitor's growth came from.

Semrush shows links too, and for the overview question of how strong a competitor's profile is at all, it is enough. The difference appears when you need to work the list: export every referring domain, sort it, find the pattern, win something back.

Three tasks where the gap is clearest:

1. Reclaiming lost links. You need history: when the link appeared, when it vanished, what the anchor said. Without history you have only a current snapshot, and a snapshot cannot tell you what is missing.
2. Link gap against competitors. Take three or four competitors and find the domains that link to them and not to you. The quality of that answer depends directly on index coverage: the more links the platform sees, the longer and more useful the list.
3. Explaining someone else's growth. A competitor grew over a quarter and the question is why. The answer sits in which links they picked up in that period, and on which pages.

A separate word on link toxicity. Both platforms offer a score and a disavow workflow, and both scores deserve scepticism: you cannot remove someone else's link, and disavow is hygiene against paid links and PBNs rather than a growth lever. With no history of buying links on the project, disavow work is almost certainly not what a month is best spent on.

Keywords and volume

Closer to parity here than the reputation suggests, but with different emphases.

Semrush traditionally carries a broader paid-search database: which ads a competitor runs, on which queries, against which landing pages. For teams running SEO and paid search together that saves a subscription, and more importantly it shows which queries a competitor is willing to spend money on. That is a more honest signal of commercial value than any difficulty score.

Ahrefs is easier to work with on traffic potential: alongside the volume of a query it estimates how much traffic a top-ranking page actually gets across the whole cluster. For content planning that is closer to the question you were asking: a page targeting a thousand-searches-a-month query can bring five thousand visits because it also ranks for a hundred related phrasings.

A warning that applies to both: the keyword difficulty score. It is a convenient single number, and it is almost always computed from the link characteristics of the current top ten. It knows nothing about how good the content in those results is, whether you have expertise in the topic, or how many funded players are in the market. Using it as a first-pass filter is fine; making decisions on it is not.

The two also expand a keyword list differently. Ahrefs starts from pages: give it a URL that already ranks and it shows everything that URL is visible for. Semrush more often starts from the query: give it a phrase and it builds related ones around it, including phrases nobody ranks for organically but somebody advertises on. The first describes what actually earns traffic more precisely; the second is broader and serves better at the start, before you have ranking pages of your own.

The practical consequence for a new project: on an empty site Ahrefs has almost nothing to show about you, and the work has to go through competitors instead. Semrush gives more material immediately in that situation, and it is one of the few tasks where the gap runs clearly in its favour.

Neither platform matches local services on Russian-market data. That is a boundary rather than a flaw: both are built for a world where the primary engine is Google.

Competitor analysis

Semrush wins on breadth. Beyond organic it shows paid traffic, display, and social, so a report captures a competitor's whole marketing activity rather than just the search slice. That makes strong material for a client presentation.

Ahrefs wins on verifiability. Its organic keyword report for a competitor rests on what the crawler actually saw in the results, and those numbers are easier to confirm by spot-check.

The working sequence when both are available:

1. Get the competitor list from Semrush by keyword overlap; it is often not the list the client would have named.
2. Check the share of paid traffic in the same place. A competitor living on ads is not a rival in organic, even if they sit next to you in the results.
3. Take the three or four that remain into Ahrefs and work their pages: which ones earn traffic, on which clusters, and what links point at them.
4. Compute the link gap and build a target list.

With only one platform the paid-traffic step drops out, and that is a real loss: in commercial niches it is often what explains why a site with thin content outranks yours.

It is worth being explicit about who counts as a competitor. Both platforms will put anything with keyword overlap on that list: marketplaces, aggregators, directories, trade press. Half of them are neither business rivals nor models to copy: a marketplace has a different page type and a different link mass, and imitating its structure achieves nothing. The first step after the export is to strike out everything you could not reproduce, and only then compute the gap.

One more thing the platforms will not tell you: competitors in the search results and competitors in the market are different sets, and they overlap only partly. The company a client names as their main rival may not be present in organic search at all, in which case "catch them in search" has no subject. Showing that in numbers at the first meeting is cheaper than showing it after a quarter of work.

Audits and reporting

Both crawl a site and return a list of technical problems: status codes, duplicates, canonicals, speed, structured data. The differences here are interface taste rather than capability. The practical difference is crawl limits: they are tied to the plan, and it is the limit rather than the check list that usually decides whether a tool is enough for a given project. A store with two hundred thousand pages hits the ceiling on a mid plan of either. The order of checks, whichever tool you use, is covered in our technical audit checklist.

On reporting, though, Semrush is clearly ahead, and this is one of the main reasons agencies stay with it even with weaker link data. Report builder, templates, white-labelling, scheduled delivery. All of it is further developed. Across twenty clients the difference is measured in days of work a month.

Ahrefs is terser about reporting. For internal work that is fine; for a monthly client report it usually is not, and agencies fill the gap with third-party services. Counting that add-on honestly matters when comparing prices: a reporting subscription can eat the entire saving.

Working in the Russian market

For projects aimed at Yandex, both platforms are supporting tools rather than primary ones. They cover Google well, they give a link picture that does not depend on the engine at all, and they let you look at competitors. Yandex positions and local search volume have to come from elsewhere.

That is an argument for doing the arithmetic honestly. If ninety per cent of a project's traffic comes from Yandex, an expensive Western platform covers a smaller share of the work than the number of tabs in its interface suggests. The sensible configuration is a local service as the primary tool for positions and volume, with the Western platform as a second layer for links and competitors.

In that scenario Ahrefs is usually the more useful of the two, because link data does not depend on the search engine at all: a link to a site exists identically for both. What else differs between the engines is covered in Yandex and Google.

What the vendors charge

Published plans as of 19 September 2026. Both companies show prices in the visitor's local currency, so the figures below are in euros, as displayed from a European connection.

Sources: ahrefs.com/pricing and semrush.com/pricing, checked 19 September 2026. Semrush figures are the month-to-month price; annual billing is lower. Note that the Semrush plan names on the page differ from the ones familiar from older reviews, so check the limits.

The limits decide more in practice than price does. Ahrefs caps projects (5 / 20 / 50) and tracked keywords (750 / 2,000 / 5,000); Semrush caps monitored sites (5 / 5 / 15 / 40) and keywords checked daily (500 / 500 / 1,500 / 5,000). Same sources, same date.

Work from your own load rather than from the plan name. An agency with ten clients tracking a hundred keywords each is at a thousand keywords, which is already past the entry plan on either platform. Additional seats are nearly always billed separately, and on a team of three that doubles the bill.

What they cost through gbseo.ru

For a single practitioner the price gap often settles the argument by itself, simply because taking both at retail is not an option.

Prices from the gbseo.ru catalogue as of 19 September 2026; "retail" is the vendor's own price for the same subscription. The full set of nine tools is 4 999₽ a month against 36 700₽ at retail. The calculator on the homepage prices any subset, including just these two.

One clarification so expectations match reality. Shared access means access through our own cloud panel to a subscription we hold. You do not get a vendor account in your own name, you cannot contact vendor support directly, and fair-use rules apply. The subscriptions themselves are real and paid for. The details are in our write-up on cloud access.

Who should pick which

Strip the marketing from both sides and the choice comes down to four scenarios.

1. Link building as the main job. Ahrefs, no contest. Speed of new-link discovery and depth of history are what the money buys here, and the other platform does not close that gap.
2. An agency reporting to clients. Semrush. The report builder and channel coverage save hours a month, and a deck showing a competitor's paid spend sells a strategy better than a table of positions.
3. A content project growing on articles. Genuinely close. Ahrefs gives more useful planning by traffic potential; Semrush gives more useful analysis of what competitors write about and which topics earn them paid traffic. Team habit decides it, and that is a legitimate criterion: a tool someone works fast in beats a nominally stronger one.
4. Running paid search alongside SEO. Semrush, because one subscription covers both halves. A separate paid-search subscription almost certainly costs more than the gap between plans.

There is a fifth that comparisons rarely cover: working on one large site in-house, with no clients and no link building. Here the crawl limits and tracked-keyword caps decide, rather than the strength of the data: a big catalogue hits those long before it hits the limits of the analytics, so choose from the limits table rather than from reviews.

There is also a scenario where both are overkill: a fifty-page site in one region. Webmaster consoles cover nearly everything there, and the money does more good spent on content.

Is it worth holding both

At retail, almost never: two mid-tier subscriptions add up to a number where hiring another person is cheaper. Through shared access the arithmetic changes and running both becomes realistic.

With both available, the split of duties looks like this:

• Ahrefs takes links, the link gap, working through specific competitor pages, and content planning by traffic potential.
• Semrush takes the market as a whole, paid traffic, rank tracking, and everything that goes into a client report.

What not to do is run the same task in both and combine the results. Two traffic estimates do not become more accurate by averaging; they just become a third number with no source.

Agree inside the team in advance which platform is the source of truth for each metric. Without that, any argument about a trend becomes an argument about whose report is open on screen, and the client report gets rebuilt every month from whichever platform happens to look better that month.

FAQ

Whose link data is more accurate?

Ahrefs has the fuller link index and surfaces new links faster. "More accurate" here means it sees more, which is not the same as never being wrong: no index covers the whole web, and any two services will always disagree on links.

Whose traffic estimates are closer to reality?

Both are estimates, and both are best treated as relative. Comparing competitors against each other inside one tool is sound; carrying an absolute figure into a business plan is not.

Can free tools replace both?

Webmaster consoles are free, mandatory, and give better data about your own site than any paid platform. What they do not give is data about other people's sites. That is what the money buys.

What if the project only works in Yandex?

Local services first for positions and volume, with a Western platform as a second layer for links and competitors. In that scenario Ahrefs is usually the more useful of the two, because link data does not depend on the search engine.

Can keyword difficulty scores be trusted?

As a first-pass filter, yes; as grounds for a decision, no. Both platforms compute it mainly from the link characteristics of the current top ten, and it knows nothing about content quality in those results or about your expertise in the topic.

Do the plans change often?

Often enough that reviews older than a year should not be trusted. The Semrush plan names on the pricing page today already differ from the ones most comparisons use, so check the limits on the vendor's site on the day you buy.

What if the platforms report different referring domain counts?

Nothing. It is expected: the indexes differ and the overlap between them is far from complete. Pick one tool as the source of truth for links and track the trend there, using the other to find what the first did not see.