3 checks every UK SEO tools claim must pass

What to take away

How the ASA CAP Code governs SEO tool claims

The Advertising Standards Authority writes and enforces the UK advertising codes, and it covers marketing communications wherever they appear, including your own website, paid search ads, email and social posts.

If a UK marketer publishes a claim about an SEO tool, the ASA can act on a single complaint and require the advertiser to prove it.

The relevant text for most SEO tools marketing is the non-broadcast code, which applies to online ads and other marketing communications that fall outside broadcast media. It sets the rules on misleading claims, comparisons, substantiation and endorsements that this article works through.

Both sit in the ASA's published code set, which is the document to read before you write anything about rankings, traffic or revenue. The codes are not legislation, but the ASA refers non-compliant advertisers to other regulators and can require amendments or withdrawals.

Underneath the codes, the Consumer Protection from Unfair Trading Regulations 2008 make misleading commercial practices a matter of consumer law, with enforcement by Trading Standards and the Competition and Markets Authority. That matters because a claim that breaches the CAP Code can also expose a UK business to action under the Regulations.

For SEO tools specifically, the riskiest claims are about outcomes: higher rankings, more organic traffic, faster indexation, better conversions. Those are measurable, so the ASA expects measurement. A vague promise of growth is easier to defend than a specific percentage, but the codes still require that the overall impression is not misleading.

One practical consequence: the ASA looks at the ad as a whole, including disclaimers, footnotes and qualification text. A small asterisk does not rescue a headline figure that the evidence cannot support. If the qualification contradicts the headline, the headline wins in the assessment.

Where software and subscription claims go wrong

ASA complaints about software and subscription claims follow a pattern that UK marketers can plan around. The recurring problems are unqualified savings claims, headline prices that exclude mandatory costs, and performance figures with no stated method or sample.

In subscription cases, the issue is usually the total cost a consumer will actually pay. If a headline price applies only to a first term, and renewal is at a higher rate, the ASA expects that to be clear at the point the claim is made, not buried in terms.

The same logic applies to SEO tools sold on monthly or annual plans with add-on seat or usage charges.

In software performance cases, the ASA tends to ask three things: what was measured, over what period, and on what basis. A claim that a tool improved rankings by a set number of positions needs a dated test, a defined starting point and a description of the sites involved. Without that, the claim is unsubstantiated.

Comparative claims have their limits. Saying a tool is the best or the leading option invites the ASA to ask what the comparison is against and how it was measured. Comparisons against unnamed competitors, or against a competitor's weakest configuration, rarely survive scrutiny.

Endorsement cases turn on whether the person quoted actually uses the product and whether their experience is typical. A testimonial from a user who received the tool free, or who was paid, needs to be identified as such. A single exceptional result presented as normal is a misrepresentation even if the quote is real.

None of this is unique to SEO tools, but the sector attracts complaints because claims are easy to make and hard to verify. The ASA publishes its rulings, so a competitor or a consumer can find the precedent and cite it when they complain about you.

Check one: is the claim substantiated with dated evidence

Claim substantiation means holding evidence that proves the claim before you publish it, not finding it afterwards. For SEO tools, that evidence is usually a test, a dataset, a vendor report or a documented customer result, and it needs a date.

Dates matter because search behaviour, algorithms and competitor sites change. A ranking test from three years ago does not support a claim made today.

The ASA's guidance on claims, endorsements and testimonials sets out the expectation that advertisers can substantiate what they say, and the practical version of that is a dated record.

Run this test on every performance claim in your copy. If the number cannot be traced to a document with a date, a method and a source, either remove the number or describe the outcome without one.

A useful discipline is to treat the evidence file as part of the page. When the copy changes, the file changes with it. That is what our guide to why advertising rules require dated sources asks marketers to build into their publishing process.

If you work with a vendor's marketing pack, ask for the underlying test data rather than the summary slide. Vendors often hold the raw figures, and a request for them is normal. If the vendor will not supply a dated method, you cannot substantiate the claim, whatever the pack says.

Check two: are comparisons fair and verifiable

Comparative claims are held to a higher standard than simple statements, because they affect a named or identifiable competitor. The CAP Code expects comparisons to be fair, and fairness usually means a like-for-like test that another person could repeat.

Start by naming the basis of comparison: features, price, speed, accuracy or results. Then state how each option was configured. Comparing a top-tier plan with a competitor's entry plan is not a fair comparison, and that mismatch is one of the most common reasons software comparisons attract complaints.

Verifiability is the second half. If you say a tool is faster, a reader should be able to see the test that shows it. That means publishing the method, the date and, where possible, the raw data. A comparison you cannot hand to a stranger and have them reproduce is a claim you cannot defend.

Price comparisons need particular care in the UK because VAT treatment varies. HMRC rules on VAT for digital services and software licences mean the price a consumer sees may differ from the ex-VAT figure a business pays. A headline saving that ignores VAT can mislead a consumer audience.

Superlatives are the hardest claims to support. Best, fastest, most accurate and number one all imply a comprehensive comparison. Unless you have tested the market comprehensively on a stated date, replace the superlative with a specific, bounded claim about what your test showed.

Before publishing a comparison page, read our UK rules and compliance guide for affiliate and vendor claims in this market. The rule sets overlap, and a page that satisfies one can still fail another.

Check three: are testimonials and endorsements genuine

Testimonial and endorsement rules require that quotes come from real users, that material connections are disclosed, and that the experience described is not presented as typical when it is not. The ASA's guidance on claims, endorsements and testimonials is the reference point here.

Material connection means anything that could affect how much weight a reader gives the quote: payment, free access, an affiliate relationship, employment or a discount. If a reviewer received the tool at no cost, say so. If they earn commission from sign-ups, say so.

Typicality is the harder test. A single agency result from a well-optimised site may be genuine and still unrepresentative. If you use it, either present it as one example with context or hold evidence that similar users achieve similar results.

Endorsements from named organisations carry extra weight and extra risk. A logo, an award or a certification implies a relationship that must exist and be current. Check the award year, the certification status and whether the endorsing body still stands behind the claim.

Keep a simple register of every testimonial on your site: who gave it, when, what they received, and what result they reported. That register is the evidence file for this check, and it makes updates straightforward when a relationship ends.

A disclosure policy needs a single source of truth for exactly this reason. If testimonials are logged in one place and affiliate terms in another, the two will drift, and a reviewer comparing the page against the register will find the gap.

Applying the three checks to your own SEO tool copy

Work through the page in order, because the checks build on each other. Substantiation comes first, then comparison, then endorsement. A page that fails check one cannot pass the others.

Once the page is live, the maintenance question is how you verify claims over time. A review methodology means for verifying SEO tool claims that the same test is repeated on a schedule, so the evidence stays current rather than becoming a one-off snapshot.

It also helps to score the evidence behind each claim before you rely on it. A vendor's internal benchmark, an independent test and a customer case study carry different weight, and buyers increasingly ask which one you used. Our piece on how to score the evidence behind SEO tool claims sets out a simple ranking.

For teams publishing at scale, the ASA's AdviceOnline library is the practical compliance reference for marketers, with guidance notes on common claim types. It is faster than reading the full code when you need an answer on one sentence.

Two structural points finish the job. First, keep the evidence file with the page, so a copy change triggers an evidence review. Second, name an owner. In most UK teams the marketing manager owns the claim, even when an agency writes the copy.

Common questions