Is Ahrefs or Semrush more accurate?

This question usually gets asked after someone opens two tabs, sees position 7 in one tool and position 9 in the other, and wants to know which one to believe. It is a fair instinct and a slightly wrong question. Rank tracking is not a measurement like a thermometer reading, where one device is calibrated and the other is drifting. It is a sample of a result set that genuinely differs between two people sitting in the same room. Before you can decide which tool is more accurate, you have to decide what you were expecting it to be accurate about.

Three different things get called accuracy

People arguing about rank tracker accuracy are usually arguing about three separate properties without separating them, which is why the argument never resolves.

The first is correctness: does the tool report the position that a neutral searcher in the specified city, on the specified device, would actually see right now? On this, Ahrefs and Semrush are both good and roughly equivalent. Both scrape from the location you configure, both strip personalization, and both land close to what an incognito search shows.

The second is freshness: how old is the number on the screen? This is where the two products differ enormously, and it is the only one of the three with a published, verifiable answer.

The third is consistency: does the tool measure the same way every time, so that a change in the number means a change in reality rather than a change in method? This matters more than correctness for almost every real use, because you are reading the trend line, not the absolute value.

Why the two tools disagree on the same keyword

A two position gap between Ahrefs and Semrush is normal and is almost never a bug. There are five ordinary causes, and they stack.

Location granularity. One tool may be reading a national result while the other is reading a metro or city level result. Google returns genuinely different orderings for the same query in Chicago and in Phoenix, and for anything with local intent the gap is much larger than two positions. We wrote up how far that can spread in why your Google ranking is different in different locations.

Timing. If one tool checked at 3am and the other at 2pm, they are describing two different SERPs. Positions move within a day, particularly for queries with news, shopping or discussion results mixed in.

What counts as a result. Tools differ on whether a featured snippet, a video carousel or a site links block occupies a numbered slot. Count the snippet and you are position 4; skip it and you are position 3. Neither answer is wrong, they are answering different questions.

Device. Mobile and desktop results diverge routinely, and a tool configured for one while you are eyeballing the other will look broken when it is not.

Age of the reading. The big one, covered next.

The one difference you can actually verify

On the Ahrefs plan comparison table, the Rank Tracker update frequency row reads weekly across Lite, Standard, Advanced and Enterprise. Not weekly on the cheap plan and daily on the expensive one: weekly on all four, including the tier that costs $1,499 a month. A few rows down, the Brand Radar row covering tracked AI prompts reads daily on all four. Same page, same subscription, two cadences. The Ahrefs help center says the same thing in prose, and the Rank Tracker product page offers daily only through the paid Project Boost add on, billed per project.

Semrush meters Position Tracking in keywords tracked daily, and daily updates apply to all four of its published plans. So the practical comparison is not seven versus nine. It is a number taken today against a number that may have been taken last Tuesday.

That gap does not make Ahrefs wrong. It makes Ahrefs slower, and slowness reads as inaccuracy at exactly the moment you care most, which is the week something moved. If you shipped a title rewrite on Wednesday and your tracker last looked on Monday, the reading in front of you describes a version of the page that no longer exists. The full price and capability comparison, including the cost of each reading rather than each keyword, is on Ahrefs vs Semrush.

How to test it yourself in ten minutes

You do not have to take anyone's word for this, including ours. Pick five keywords where you currently rank somewhere between position 5 and position 20, because that band is where movement is real and visible. Then do four things in the same sitting, inside about a fifteen minute window.

Open an incognito window, set your search region explicitly, and record what you see for each keyword. Record what Ahrefs says. Record what Semrush says. Record what a third, independent checker says. Then compare the four columns, and pay attention to the spread rather than to any single cell.

What you will almost certainly find is that all four agree within one or two positions on most keywords, and that the outliers are keywords with heavy local intent or a lot of SERP furniture. What you should also record, and almost nobody does, is the timestamp each tool shows for its last check. That column explains more disagreements than the tools themselves do. There is a fuller version of this method, including how to read the result, in how accurate are rank trackers.

Do not expect Search Console to match either

A large share of accuracy complaints are really confusion about Google Search Console. Search Console reports an average position, aggregated across every impression your page received for that query, across every location, device and personalization state, over the period you selected. A rank tracker reports a single position from a single defined context at a single moment. These are different statistics and they are not supposed to agree.

A page that shows 8.0 in a tracker and 14.3 in Search Console is usually not a broken tracker. It is a page that ranks 8th in your chosen sample market and considerably worse in the long tail of places it also appears. The distinction is worked through in Search Console average position versus a rank tracker, and it is worth reading before you file a support ticket with anyone.

Who this argument actually matters for

If you check rankings once a month for a client report, this whole question is academic. Weekly readings are more than adequate, both tools are correct enough, and you should pick on the strength of everything else in the subscription: the backlink index if you do link work, the breadth if you run advertising and content alongside SEO. The current figures for both are on Ahrefs pricing and Semrush pricing.

It matters if you are running tests, shipping changes weekly, or working on a site where a three position slide on one commercial term is worth real revenue. In that situation a weekly reading is not a measurement, it is a rumor, and the cadence question outranks the correctness question by a wide margin. That is the case weekly versus daily rank tracking sets out in full.

And it barely matters at all for a third group, which is larger than the other two put together: small businesses where the constraint is not the quality of the number but whether anyone acts on it. If your marketing stalls whenever the week gets busy, a two position argument between two expensive tools is not your bottleneck, and something that keeps the campaigns running when nobody has time to run them will move revenue more than either subscription will. Buy the measurement when you have the capacity to respond to it.

The short version

Ahrefs and Semrush are about equally correct, and both are close enough to what a neutral searcher sees that the difference does not change a decision. Semrush is measurably fresher, because it checks daily on every plan while Ahrefs checks weekly on every plan and sells daily as a per project add on. If you have been treating a position gap between the two as an accuracy problem, check the timestamps first. In most cases you are not comparing two measurements of the same thing, you are comparing Tuesday to today.

If the ranking table is the report you open most, neither suite is the efficient purchase, and the arithmetic behind that claim is laid out on Ahrefs vs Semrush alongside the honest list of what a dedicated tracker does not give you.