Size-based 'Only X left!' stock message: about +$899K a month
Commentary byLiftArchiveOur analysis, not theirsTuckernuck 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.
- 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.
The change
A low-stock count for the selected size appears under the size picker.
Simplified mockup drawn by LiftArchive from the shared screenshots.
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 of the result, not the practitioner's claim.
- 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.
Who ran it
Domaine ran this test for Tuckernuck and published the results (Visually case study). The numbers are theirs; the summary and commentary on this page are ours.
Read the original case study on Domaine →
How to run this test on your store
- 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
- Guardrails
- Conversion rate
- Return rate
- 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.
Questions
Do low-stock messages increase sales?
They often do when the stock is real.
Tuckernuck's size-based message was estimated to add about $899K a month.
Should stock counts be per size or per product?
Per size is more useful in apparel, because a product can be in stock overall while the shopper's size is nearly gone.
At what stock level should I show the message?
The case study did not share a threshold.
Many stores show it only below a small number, so the message stays rare and credible.
Similar tests
@oliverkenyon@oliverkenyon@oliverkenyon
Convertibles
@DaveDiederen@DaveDiederen