Amazon frames the Prime trial as "30 days, on us"

The psychology

Why it nudges

"On us" frames the trial as a gift rather than a cheaper price: the zero-price effect (free feels different from cheap). We captured the hero only, not Amazon's current sign-up or cancel flow. Whether this framing lifts trial starts for Amazon is not public.

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

Context

A retailer whose paid membership bundles delivery, video and deals. The trial converts to a paid plan.

Honest nudge or dark pattern?

Grey area

Grey area: the hero we captured doesn't show the price after the trial next to "on us". In June 2023 the US FTC sued Amazon, alleging Prime sign-up and cancellation used dark patterns; Amazon settled in September 2025 ($2.5bn total) and agreed to clearer disclosures and easier cancellation. That case covered the US; our capture is UK. See deceptive.design/hidden-subscription and deceptive.design/obstruction.

Sources: FTC complaint, 21 Jun 2023 · FTC settlement, 25 Sep 2025 · FTC case page

Steal this, honestly

If the trial is truly free, say so plainly, and state what it costs afterwards in the same view.

What to test: "30 days, on us" vs "Free 30-day trial". Measure trial starts and month-2 retention.

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: Amazon: Amazon frames the Prime trial as "30 days, on us"
Bias: Zero-price effect: 'Free' is treated as more than just a lower price.
Why it nudges: "On us" frames the trial as a gift rather than a cheaper price: the zero-price effect (free feels different from cheap). We captured the hero only, not Amazon's current sign-up or cancel flow. Whether this framing lifts trial starts for Amazon is not public.
Our verdict: Grey area. Grey area: the hero we captured doesn't show the price after the trial next to "on us". In June 2023 the US FTC sued Amazon, alleging Prime sign-up and cancellation used dark patterns; Amazon settled in September 2025 ($2.5bn total) and agreed to clearer disclosures and easier cancellation. That case covered the US; our capture is UK.
Source page: https://nudgeswipe.com/examples/amazon-prime-30-days-on-us/ (JSON: https://nudgeswipe.com/api/teardowns/amazon-prime-30-days-on-us.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 amazon.co.uk, 16 Oct 2026
Shampanier, Mazar & Ariely (2007), Zero as a special price. doi.org/10.1287/mksc.1060.0254
FTC complaint, 21 Jun 2023: ftc.gov
FTC settlement, 25 Sep 2025: ftc.gov
FTC case page: ftc.gov
deceptive.design: hidden-subscription
deceptive.design: obstruction

Amazon frames the Prime trial as "30 days, on us"

Why it nudges

Grey area

Apply this with your agent

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