Online comparison services: when apparent neutrality becomes unfair competition.

An online comparison service does not necessarily sell the products it ranks. It is nevertheless subject to transparency rules. By presenting itself as a comparison tool, it gives its ranking particular authority and must enable consumers to understand how that ranking was produced.

The Paris Business Activities Court applied that principle in a first-instance judgment of 24 September 2026. The comparison website publisher and the company whose products benefited from the arrangement were held liable for unfair competition. The fault was not merely placing one brand first, but blurring the line between objective comparison and commercial promotion.

A comparison service implicitly promises to organise several offers through an intelligible method. Consumers may treat the ranking as an independent assessment. Where the website is controlled by a listed brand, that fact changes how the result should be read and must be disclosed unambiguously.

The judgment does not prohibit corporate groups from owning comparison websites or from ranking their own products highly. It addresses the gap between the independence suggested and the actual purchasing journey. A discreet legal notice in the footer may not be enough where the interface as a whole suggests impartial comparison.

The fault did not arise from a favourable ranking alone. It arose from confusion between advice presented as objective and a commercial promotion operation.

A premium pillow company sued two companies from a competing group: one sold products and the other published a comparison website. The claimant also alleged imitation of its product and advertising, and parasitism.

The court rejected the imitation and parasitism claims. The claimant had not sufficiently proved the specificity of what had allegedly been copied, a likelihood of confusion between the products or appropriation of an identified economic value. Resemblance or similar advertising is not enough by itself.

The comparison website claim produced a different result. Group products repeatedly occupied the leading positions, brand promotions appeared across the website, including pages devoted to competitors, and the path to the group’s sales website was more prominent than links to other sellers. The published methodology did not explain the sample, criteria or weighting.

Article L. 111-7 of the French Consumer Code applies to online comparison providers. They must give fair, clear and transparent information about listing, ranking and delisting methods and about any contractual relationship, corporate link or payment that influences the ranking.

Article D. 111-7 of the French Consumer Code requires a specific, directly and easily accessible section explaining the ranking criteria and their meaning. The default ranking criterion must also appear at the top of every results page. An offer whose position depends on payment must be identified as an advertisement.

These duties are not a formality confined to terms and conditions. At the point where users read the ranking, they must be able to understand why one offer appears above another and which economic interests may affect that position.

The main parameters determining the ranking of offers shown after a search are material information. Omitting them may fall within Article L. 121-3 of the French Consumer Code, particularly where the true commercial intent is not already apparent from the context.

Article L. 121-2 may also be relevant where the person on whose behalf the practice is carried out is not clearly identifiable. The legal analysis turns on the presentation as a whole: website name, page architecture, buttons, promotions, outbound links, methodology and prominence of the corporate relationship.

Evidence begins with the website as users see it. A French judicial commissioner can formally record results, positions, promotions, link sizes, affiliate notices and methodology pages. Records taken on several dates may show that an advantage is recurrent rather than accidental.

The published account should then be compared with actual operation. Are criteria defined and weighted? Do tests exist? Are updates dated? Is sponsored content labelled? Are corporate links disclosed where the user decides? A formal demand for methodology and supporting data may complete the evidence.

A competitor does not sue as a consumer. It relies on Article 1240 of the French Civil Code and must establish fault, loss and causation. Breach of rules governing commercial activity may constitute the fault where it gives the operator an undue competitive advantage.

Here, the transparency failures allowed the comparison website to capture consumer attention for a group brand. The court characterised this as unfair competition. This route may support claims for cessation, publication of the judgment and damages before the Paris Business Activities Court.

Yes, if the evidence goes beyond the fact that the brand benefited from the ranking. The judgment held the publisher liable because it controlled the comparison website, and also the seller because its products directly benefited, the links led to its sales website and the overall arrangement showed a shared economic interest.

This assessment remains fact-specific. Common group ownership does not automatically make every company liable. The claimant should document each company’s role, direct benefits, traffic flows, advertising campaigns and possible involvement in designing the ranking.

The two companies were ordered jointly to pay EUR 80,000. The court assessed loss by applying a percentage to the gross margin of the relevant product line over two years. It rejected a separate moral damage claim that was insufficiently substantiated. The decision shows why a claimant should connect biased ranking to verifiable financial data.

The operative part of the judgment also had to appear on half of the home pages of both the comparison website and the brand website, and on their Facebook, LinkedIn and X accounts, for three months, subject to a EUR 5,000 daily penalty for delay. Publication in nine press titles was refused.

The publisher was also ordered to stop presenting the website as neutral without disclosing the sample and ranking criteria, and to stop combining a claim of independence with extensive, recurring promotion of group products. The remedies may therefore require lasting changes to interface design and acquisition strategy.

Start by mapping every economic interest: ownership, contracts, affiliation, click payments, commissions, visibility purchases and data exchanges. Those links should be explained in accessible language, in the right place and before they influence the consumer’s decision.

The methodology should be auditable. The sample, criteria, definitions, weighting, update frequency and testing limits should be documented. Sponsored material should be separated from editorial ranking. Digital law, e-commerce and advertising law teams should review the same user journey.

INFLUXIO audits ranking methods, interfaces, transparency notices and economic relationships between publishers, advertisers and brands. The firm assists with compliance before launch or following a formal notice while preserving a clear commercial journey.

For affected competitors, the firm organises evidence, analyses the published methodology, identifies indicators of undue advantage and quantifies loss. It then prepares claims for cessation, publication and compensation. Contact the firm for an assessment of a comparison service and the remedies available.