# Size-based 'Only X left!' stock message: about +$899K a month

- Outcome: Won
- Page type: Product page (Ecommerce)
- Elements: Low-stock & scarcity messaging, Variant, size & option selectors
- Test run by: [Domaine](https://liftarchive.com/practitioners/domaine/)
- Commentary by: LiftArchive (our analysis, not theirs)
- Original source: https://visually.io/public/case-studies/tuckernuck
- Page: https://liftarchive.com/test/tuckernuck-size-based-low-stock-message/

Tuckernuck added a low-stock message on product pages that shows how many units are left in the selected size, with an estimated revenue uplift of about $899K a month. Domaine ran this test for the women's fashion brand Tuckernuck and built it in Visually, which published it as a case study. The monthly figure is an estimate, and sample size and significance were not shared.

## Result

**about +$899K a month**

- Revenue: about +$899K estimated monthly uplift.
- The figure is a projection, not measured revenue, and no conversion rate change was shared.
- Sample size, test length and confidence were not reported.

## Control

Product pages showed no stock message when a shopper picked a size.

## Variant

When a shopper selected a size, a dynamic "Only X left!" message showed the stock count for that size.

## Why it likely won (our reading)

- Showing stock for the chosen size makes the scarcity specific and believable, not a generic sitewide badge.
- Fashion shoppers know popular sizes sell out, so a low count prompts them to buy now rather than wait.
- The message appears right when the shopper commits to a size, close to the add-to-cart decision.

## Caveats

The monthly uplift is an estimate. Vendor-reported in a Visually case study; sample size, test length and significance were not shared.

## How to run this test

- Hypothesis: If we show a real stock count for the selected size when it runs low, then more shoppers will buy now because they see that their size may sell out.
- Primary metric: Revenue per visitor
- Guardrail: Conversion rate
- Guardrail: Return rate
- Guardrail: Add-to-cart rate for sizes with high stock
- Who should test it: Apparel and footwear stores with limited stock per size and fast-moving drops. Only show true counts; fake scarcity can damage trust, and it won't help stores with deep, steady inventory.

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Credit: Domaine ran this test and owns the result. Summary and commentary by LiftArchive (https://liftarchive.com/test/tuckernuck-size-based-low-stock-message/).
Usage: Free to use, quote and build on, with credit and a link: name the practitioner or organization that ran the test and link to its LiftArchive page. The results belong to the practitioners who ran and shared them; the summaries and commentary are LiftArchive's.