Teardowns › Pricing & paywalls › Zero-price effect

Grammarly says "$0 payment today" and promises a reminder 2 days before the trial ends

Grammarly · Pricing page · Logged-out visitors (USD shown) · grammarly.com · captured 16 Oct 2026

ConditionalZero-price effect Social proof Regret aversion

Grammarly Pricing page, captured 16 Oct 2026 — Our capture, 16 Oct 2026, logged out. Numbers match the steps.

Step by step

1
Zero-price effect
The headline: "Try Pro for $0 today".
2
Social proof
"Trusted by over 40 million people and 50,000 organizations".
3
Regret aversion
Pro shows "Email reminder 2 days before trial ends." and "$0 payment today".

Prices quoted in dollars ($), exactly as shown on the page we captured (US-priced). Prices vary by region and change over time.

The psychology

Why it nudges

"$0 today" makes starting feel free (the zero-price effect), and the user count reassures. The reminder promise lowers the fear of being charged by surprise. Whether this lifts trials for Grammarly is not public.

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

Context

A writing assistant converting free users to Pro.

Honest nudge or dark pattern?

Conditional

Honest nudge if the Pro price ($12) stays visible, which it was on the page we captured.

Steal this, honestly

Put "$0 today" next to the full price, never instead of it.
Promise a reminder before billing, and honour it.

What to test: With vs without the reminder line. Measure trial starts and charge disputes.

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: Grammarly: Grammarly says "$0 payment today" and promises a reminder 2 days before the trial ends
Bias: Zero-price effect: 'Free' is treated as more than just a lower price.
Why it nudges: "$0 today" makes starting feel free (the zero-price effect), and the user count reassures. The reminder promise lowers the fear of being charged by surprise. Whether this lifts trials for Grammarly is not public.
Our verdict: Conditional. Honest nudge if the Pro price ($12) stays visible, which it was on the page we captured.
Source page: https://nudgeswipe.com/examples/grammarly-zero-payment-today-reminder/ (JSON: https://nudgeswipe.com/api/teardowns/grammarly-zero-payment-today-reminder.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.

Open in ChatGPT Open in Claude Open in Grok Open in Cursor

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 grammarly.com, 16 Oct 2026
Shampanier, Mazar & Ariely (2007), Zero as a special price. doi.org/10.1287/mksc.1060.0254

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