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  • 100Principles
  • 850+Ready-to-use examples
  • FreeForever
Why it matters

The biggest lifts come from the smallest cues

Across thousands of A/B tests on ecommerce sites, the pattern is consistent: the biggest conversion lifts rarely come from redesigns or feature overhauls.

They come from small, science-backed cues placed exactly where decisions happen. A single word. A color. A number. These micro-moments work with how our brains actually make choices, andpersuasion done right isn't manipulation, it's clear communication.

How it works

Three steps to better marketing

Explore, learn and apply behavioral science to your campaigns.

  • Explore

    Browse by category or search for a specific use case.

  • Learn

    See real examples and understand when each principle applies.

  • Apply

    Generate an AI prompt customized to your campaign.

AI-powered prompts

From principle to practice in seconds

Every principle comes with a prompt generator tailored to your campaign.

  • Customize your context

    Pick a channel, goal and audience. The prompt adapts to your campaign.

  • Instant AI prompts

    Ready for ChatGPT or Claude, built around your campaign rather than a generic template.

  • Apply immediately

    Copy, paste, generate. Each prompt asks for A/B test setups you can run.

Who this is for

Built for modern marketers

Whether you're optimizing funnels or crafting campaigns, these principles work.

  • Ecommerce & growth marketers

    Research-backed tactics for product pages and checkout flows.

  • UX & conversion specialists

    Design experiences on proven psychological principles.

  • Creative & campaign teams

    Write copy using the behavioral insights top brands rely on.

Explore all 100 principles

Open any principle for the research behind it, examples per channel, and a campaign prompt you can generate.

eCommerce suitability: All

Showing all 100 principles

1DESBelonging & Conformity2DESIn-group BiasBelonging3DESBandwagon EffectBelonging4DESSocial ProofBelonging5DESSocial Default BiasBelonging6DESLikingLiking
7DESPersonifi­cationLiking8DESPratfall EffectLiking9DESTrustLiking10DESReciprocityLiking11DESMimicryLiking12DESMere Exposure EffectLiking13DESUnityLiking14DESUnderdog EffectLiking15DESTriviali­zation EffectLiking16DESCountry of Origin EffectStatus17DESHalo EffectStatus18DESNoble Edge EffectStatus19DESCostly SignallingStatus20DESPro-Innovation BiasStatus21DESIllusory Truth EffectStatus22DESAuthorityStatus23DESNoveltyStatus24MENProcessing Difficulty EffectFluency25MENRhyme as Reason EffectFluency26MENNeglect of ProbabilityFluency27MENConjunction BiasFluency28MENContext EffectFluency29MENSpeak Easy EffectFluency30MENTemptation CouplingFluency31MENPresent BiasFluency32MENPrimacy & Recency EffectFluency33MENRound Pricing PreferenceFluency34MENFront-loadingFluency35MENBuy Now EffectFluency36MENVon Restorff EffectEmphasis37MENCheerleader EffectEmphasis38MENDecoy EffectEmphasis39MENPerceptual Incongru­enceEmphasis40MENContrast EffectEmphasis41MENCenter Stage EffectEmphasis42MENTop Ten EffectEmphasis43MENChoice ParadoxEmphasis44MENAnchoringEmphasis45MENEmphasis FramingEmphasis46MENDistinction BiasEmphasis47MENFacial DistractionFocus48MENVisual CueingFocus49MENFocussing EffectFocus50MENGaze CueingFocus51MENPicture Superiority EffectFocus52INTCognitive DissonanceConsistency53INTBen Franklin EffectConsistency54INTCommitment & ConsistencyConsistency55INTGeneration EffectInvestment56INTSunk Cost EffectInvestment57INTSelf-generation Memory EffectInvestment58INTIKEA EffectInvestment59INTZeigarnik EffectCompletion60INTChoice ClosureCompletion61INTComplete­ness EffectCompletion62INTSet CompletionCompletion63INTGoal Gradient EffectCompletion64INTConceptual & Associative PrimingConfirmation65INTChoice-supportive BiasConfirmation66INTInformation BiasConfirmation67INTSuggesti­bilityConfirmation68INTHoroscope EffectConfirmation69INTEquivalency FramingConfirmation70INTSelective PerceptionConfirmation71INTConfir­mation BiasConfirmation72RSKScarcityAvoid Loss73RSKNeed for CertaintyAvoid Loss74RSKAmbiguity AversionAvoid Loss75RSKBackfire EffectAvoid Loss76RSKLimited Numbers & EditionsAvoid Loss77RSKFear AppealsAvoid Loss78RSKMotivating UncertaintyAvoid Loss79RSKLoss AversionAvoid Loss80SUBOutcome Bias81SUBReflection Effect82SUBFresh Start Effect83SUBPlanning Fallacy84SUBWeather Effects85SUBLucky Loyalty Effect86SUBPeak-End Rule87AUTHobson's +1 Choice EffectControl88AUTAutonomyControl89AUTBut You Are FreeControl90AUTIllusion of ControlControl91COSHyperbolic Discounting92COSMoney Illusion93COSCashless Effect94COSMental Accounting95COSBottom Dollar Effect96COSPrice-value Bias97COSInaction Inertia98COSPrice Sensitivity99COSEndowment Effect100COSPain of Paying

This table synthesizes peer-reviewed behavioral science research. Spot something to refine?Let us know.

Why we built this

Science-backed persuasion for everyone

Crobox started out putting behavioral science to work on ecommerce sites, learning which nudges move which shoppers. We built this library to make those proven techniques available to every marketer: each principle is grounded in research, checked against real A/B tests and explained in plain language.

Today the same thinking powers our guided selling and product discovery tools, which help shoppers make confident decisions instead of drowning in choice.

Discover the why behind the buy

Put behavioral science to work on your product pages