Moonpig pairs a "FREE CARD with any bouquet" with 30% off the first card

The psychology

Why it nudges

A free add-on is the zero-price effect at work. A first-order discount is a plain incentive. Reminders tie the next purchase to a date the customer sets, close to an implementation intention. Whether these lift orders for Moonpig is not public.

● Mixed evidence · More on zero-price effect, with sources →

Context

A UK online card and gift retailer.

Honest nudge or dark pattern?

Honest nudge

Honest nudge as captured.

Sources: Captured by Nudgeswipe, 16 Oct 2026 (logged out)

Steal this, honestly

Make the free item automatic rather than code-based if you can.
Offer reminders as a service, not a sales channel.

What to test: Free card automatic vs by code. Measure bouquet orders and code-entry drop-off.

Next: run it on your product

Apply this with your agent

Take the steps above into your own flow. The prompt carries this teardown, the honest-vs-dark line and the steps.

You are helping me apply a behavioural-design pattern ethically.

Pattern: Moonpig: Moonpig pairs a "FREE CARD with any bouquet" with 30% off the first card
Bias: Zero-price effect: 'Free' is treated as more than just a lower price.
Why it nudges: A free add-on is the zero-price effect at work. A first-order discount is a plain incentive. Reminders tie the next purchase to a date the customer sets, close to an implementation intention. Whether these lift orders for Moonpig is not public.
Our verdict: Honest nudge. Honest nudge as captured.
Source page: https://nudgeswipe.com/examples/moonpig-free-card-with-bouquet/ (JSON: https://nudgeswipe.com/api/teardowns/moonpig-free-card-with-bouquet.json)

Rules: say a brand "uses" a tactic, never that it "worked"; outcomes are not public unless the company published them; no invented uplift estimates; flag mixed evidence. Honest nudge = true, visible, easy to reverse, and in the user's interest. Dark pattern = hides costs, fakes scarcity or popularity, shames, or makes leaving harder than joining. Quote company-published results as "X reports", with the source link, and don’t generalise them. Don’t cite retracted or failed-to-replicate studies as support (e.g. Ariely & Wertenbroch 2002). Don’t state study figures unless they’re on this page or in a source you can link. If an idea crosses the line, link the matching deceptive.design pattern.

Tasks:
1. Ask me for my product, the flow (URL or screenshots) and the goal.
2. Audit where this pattern already appears, or could, in that flow.
3. Propose 2-3 ethical experiments: hypothesis, variant copy or UI, primary metric, and a guardrail metric (refunds, complaints, cancellations).
4. Flag every dark-pattern risk and say how to stay on the honest side.

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ChatGPT, Claude, Grok and Cursor open with the prompt filled in (it is also copied, in case the prefill doesn't load). Gemini and Codex don't support prefilled links, so the prompt is copied and the app opens; paste it in.

Sources

Our capture of moonpig.com, 16 Oct 2026
Shampanier, Mazar & Ariely (2007), Zero as a special price. doi.org/10.1287/mksc.1060.0254
Captured by Nudgeswipe, 16 Oct 2026 (logged out): moonpig.com

Moonpig pairs a "FREE CARD with any bouquet" with 30% off the first card

Why it nudges

Honest nudge

Apply this with your agent

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