Dark-pattern family · 12 patterns

Interface interference

Privileges business-favoured actions through visual, linguistic or structural presentation of choices and information.

This family groups related interface mechanisms for learning and journey review. It is not a legal category and does not make every matching interface unlawful. Start with the mechanism, then examine the complete decision, audience, effect and EU rule actually within scope.

Recognition framework

How to review interface interference.

Review the complete decision surface rather than one colour or sentence. Compare prominence, order, wording, defaults and information timing across all realistic options. Then test whether users can predict outcomes and compare material consequences on mobile, with keyboard navigation and with assistive technology.

Recognition signals

  • Visual, linguistic or structural presentation favours the trader’s outcome.
  • A control’s appearance or wording obscures its consequence or a material alternative.
  • Information needed for comparison is delayed, fragmented or disproportionately difficult to use.

Decision points

  • The moment an option first becomes actionable
  • The relative prominence and wording of genuine alternatives
  • Where price, duration and other material consequences appear
  • The outcome produced by each control and default

Fair-design principles

  • Give materially different choices comparable clarity and predictable labels.
  • Place price, duration and consequence information at the associated decision.
  • Test comprehension and choice quality rather than acceptance or conversion alone.

Evidence to retain

  • Design tokens and responsive interface captures
  • Copy, default and experiment version history
  • Task-based comprehension and comparison results
  • Control outcome and immediate-reversal records

Boundary to keep visible

Visual hierarchy, recommendation and progressive disclosure are ordinary design tools. Concern increases when presentation conceals a consequence, misstates an action or makes a realistic alternative materially harder to understand. The effect and surrounding evidence remain essential.

Journey coverage

Where interface interference can become visible.

Review the state before the decision, the controls and information available at that moment, the immediate result and any later account or billing consequence. Journey links below show where this family appears in the published taxonomy; they do not imply that every product or every stage contains the mechanism.

8 related patterns

Checkout

Checkout concentrates price, add-ons, urgency, identity and the final payment action. Review should begin with the state carried into the basket and finish only when the order, receipt and account state agree. A control that appears clear in isolation can still be misleading when a fee arrives late, a removed item returns or the final button does more than its label predicts.

Open the journey guide →

6 related patterns

Pricing

Pricing review starts before checkout. Search cards, campaign landing pages, recommendation logic, comparison tables and membership offers can each shape the price a person understands. Teams should reconstruct the comparable payable amount, the basis of every saving or popularity claim and the information available when a product first becomes a realistic option.

Open the journey guide →

5 related patterns

Signup

Signup is where access, identity, permissions and first-run choices meet. A useful review follows the user from the promise made before registration through every required field, default, consent request and first-use screen. The question is not whether signup is persuasive, but whether people can understand what is necessary, what is optional and what each control will do before they commit.

Open the journey guide →

4 related patterns

Cancellation

Cancellation review compares the represented exit with the steps, channels and final account state needed to complete it. Legitimate identity or account-protection controls can add proportionate friction, but retention prompts, language and technical dead ends should not prevent a clear instruction from reaching a durable outcome.

Open the journey guide →

5 related patterns

Subscription

A subscription is a lifecycle rather than one purchase screen. Trial conversion, billing period, renewal, plan changes and continued access must be understood together. The interface should enable a person to distinguish a one-off payment from a recurring arrangement and compare the present benefit with later price and exit consequences.

Open the journey guide →

2 related patterns

Account Management

Account settings determine whether earlier choices remain controllable. Privacy preferences, exports, deletion, support and content controls often span several channels and states. Review therefore needs to test persistence and actual system outcomes, not only whether a settings label or help article exists.

Open the journey guide →

Pattern directory

Explore every interface interference pattern.

Each detail page contains two fictional interface comparisons, practical recognition and exclusion criteria, a fairer alternative, review questions and a legal-status map that keeps editorial taxonomy separate from current law and the announced DFA process.

Editorial analysisInterface interference

Bundled options

Distinct products, services, permissions or purposes are grouped under one choice so the user cannot readily understand or select them separately. The label describes a recurring design mechanism; whether a particular implementation is harmful or unlawful depends on the complete journey, audience, evidence and rules within scope.

  • Checkout
  • Pricing

2 visual examples

See visual examples: Bundled options
Editorial analysisInterface interference

Choice or information overload

The volume or organisation of options or information makes meaningful comparison impractical and channels users toward a default or business-favoured path. The label describes a recurring design mechanism; whether a particular implementation is harmful or unlawful depends on the complete journey, audience, evidence and rules within scope.

  • Pricing
  • Signup

2 visual examples

See visual examples: Choice or information overload
Editorial analysisInterface interference

Complex or inaccessible language

Material guidance is presented in a language or level of complexity that makes informed choice materially harder for the target user. The label describes a recurring design mechanism; whether a particular implementation is harmful or unlawful depends on the complete journey, audience, evidence and rules within scope.

  • Cancellation
  • Checkout

2 visual examples

See visual examples: Complex or inaccessible language
Current lawInterface interference

Confirmshaming

Option labels use shame, guilt, fear or asymmetric emotional framing to move the user away from the outcome they would otherwise choose. The label describes a recurring design mechanism; whether a particular implementation is harmful or unlawful depends on the complete journey, audience, evidence and rules within scope.

  • Signup
  • Checkout
  • Subscription
  • +1

2 visual examples

See visual examples: Confirmshaming
Editorial analysisInterface interference

Disguised advertisement or action

A promotional or biased action is presented as ordinary content or as a different control, causing interaction under a mistaken understanding. The label describes a recurring design mechanism; whether a particular implementation is harmful or unlawful depends on the complete journey, audience, evidence and rules within scope.

  • Pricing

2 visual examples

See visual examples: Disguised advertisement or action
Current lawInterface interference

False hierarchy

Parallel options are presented as if one were hierarchically primary, giving a business-favoured option materially greater visual or interactive prominence. The label describes a recurring design mechanism; whether a particular implementation is harmful or unlawful depends on the complete journey, audience, evidence and rules within scope.

  • Signup
  • Pricing
  • Checkout
  • +1

2 visual examples

See visual examples: False hierarchy
Editorial analysisInterface interference

Feedforward ambiguity

A control does not let the user reasonably predict its material outcome before activation. The label describes a recurring design mechanism; whether a particular implementation is harmful or unlawful depends on the complete journey, audience, evidence and rules within scope.

  • Checkout
  • Account Management

2 visual examples

See visual examples: Feedforward ambiguity
Current lawInterface interference

Hidden information

Information relevant to the decision is absent or presented so ineffectively that it is unlikely to inform the user at the decision point. The label describes a recurring design mechanism; whether a particular implementation is harmful or unlawful depends on the complete journey, audience, evidence and rules within scope.

  • Pricing
  • Checkout
  • Subscription
  • +1

2 visual examples

See visual examples: Hidden information
Editorial analysisInterface interference

Misleading reference pricing

A comparison or prior price creates an inaccurate or insufficiently explained impression of savings. The label describes a recurring design mechanism; whether a particular implementation is harmful or unlawful depends on the complete journey, audience, evidence and rules within scope.

  • Pricing

2 visual examples

See visual examples: Misleading reference pricing
Current lawInterface interference

Preselection and defaults

A business-favoured option with a plausible adverse consequence is active before a deliberate user choice. The label describes a recurring design mechanism; whether a particular implementation is harmful or unlawful depends on the complete journey, audience, evidence and rules within scope.

  • Signup
  • Checkout
  • Subscription
  • +1

2 visual examples

See visual examples: Preselection and defaults
Editorial analysisInterface interference

Pressured upselling

A more expensive or profitable option is made the practical focal choice through preselection, visual prominence or obscured lower-cost alternatives. The label describes a recurring design mechanism; whether a particular implementation is harmful or unlawful depends on the complete journey, audience, evidence and rules within scope.

  • Subscription
  • Checkout

2 visual examples

See visual examples: Pressured upselling
Editorial analysisInterface interference

Trick question

A question or control uses confusing, reversed or leading semantics so the user's likely interpretation may not match the resulting choice. The label describes a recurring design mechanism; whether a particular implementation is harmful or unlawful depends on the complete journey, audience, evidence and rules within scope.

  • Signup
  • Cancellation

2 visual examples

See visual examples: Trick question

Evidence-led workflow

Turn a visual signal into a reviewable record.

  1. Reproduce the complete decision path and preserve each material state, option, disclosure, default and price before and after the action.
  2. Check the pattern’s inclusion criteria and legitimate-use boundaries instead of classifying from appearance alone.
  3. Verify the operating facts behind timing, stock, ranking, price, consent and account state, and record what evidence would falsify the initial concern.
  4. Apply current law, announced preparation, matters under consideration and unknown future details as separate layers with dated sources.

Evidence base

Sources

  1. An Ontology of Dark Patterns KnowledgeGray et al.; ACM CHI 2024 · Secondary · checked 2026-09-14 · DOI 10.1145/3613904.3642436; arXiv:2309.09640
  2. Behavioural study on unfair commercial practices in the digital environmentEuropean Commission, Directorate-General for Justice and Consumers · Secondary · checked 2026-09-14 · DOI 10.2838/859030; ISBN 978-92-76-52316-1
  3. Unfair Commercial Practices DirectiveEuropean Parliament and Council of the European Union · Primary · checked 2026-08-09 · Directive 2005/29/EC; CELEX 02005L0029-20220528
  4. Dark commercial patternsOrganisation for Economic Co-operation and Development · Secondary · checked 2026-09-14 · OECD Digital Economy Papers No. 336
  5. Digital Services ActEuropean Parliament and Council of the European Union · Primary · checked 2026-08-09 · Regulation (EU) 2022/2065; CELEX 32022R2065
  6. Digital Fairness Act: call for evidence for an impact assessmentEuropean Commission · Primary · checked 2026-08-09 · Initiative 14622; Ares(2025)6275573
  7. Consumer Rights DirectiveEuropean Parliament and Council of the European Union · Primary · checked 2026-08-09 · Directive 2011/83/EU; CELEX 02011L0083-20220528
  8. General Data Protection RegulationEuropean Parliament and Council of the European Union · Primary · checked 2026-08-09 · Regulation (EU) 2016/679; CELEX 32016R0679
  9. Dark Patterns at Scale: Findings from a Crawl of 11K Shopping WebsitesMathur et al.; arXiv · Secondary · checked 2026-09-14 · arXiv:1907.07032
  10. Review of EU consumer lawEuropean Commission, Directorate-General for Justice and Consumers · Primary · checked 2026-09-14
  11. Commission work programme 2026: Europe's Independence MomentEuropean Commission · Primary · checked 2026-09-14 · COM(2025) 870 final; CELEX 52025DC0870; Annex I item 30