Low-stock and scarcity messages in the cart: +16.49% conversion rate
Commentary byLiftArchiveOur analysis, not theirsAdding limited-stock and scarcity messages to the cart lifted conversion rate by 16.49% and revenue by 24.57%.
ConvertPolo ran this test for Sparify, a motorcycle gear and parts store, on its mobile site, and it was published as a VWO case study.
- Conversion rate: +16.49% on mobile.
- Revenue: +24.57%. Revenue grew faster than conversions, so order values may also have moved up.
- Both numbers are reported by the agency and the testing vendor.
The change
The variant adds limited-stock and scarcity messages to the cart.
Simplified mockup drawn by LiftArchive from the shared screenshots.
Control
The cart showed no stock levels and no urgency cues. Nothing nudged shoppers to check out now rather than later.
Variant
Limited-stock and scarcity messages appeared in the purchase journey, prompting shoppers to complete checkout instead of putting it off.
Why it likely won
Our reading of the result, not the practitioner's claim.
- Shoppers who reach the cart are close to buying. A reason to act now can tip a postponed purchase into an order.
- Motorcycle parts often fit specific models, so a low-stock warning on a part someone needs feels relevant.
- Stock information also answers a practical question: will this item actually ship?
Caveats: Mobile only, and no sample size, duration or confidence level was shared. Scarcity messages only build trust if the stock counts are real.
Who ran it
ConvertPolo ran this test for Sparify and published the results (VWO case study). The numbers are theirs; the summary and commentary on this page are ours.
Read the original case study on ConvertPolo →
How to run this test on your store
- Hypothesis
- If we show real low-stock messages in the cart, then more shoppers will complete checkout because they won't want to risk the item selling out.
- Primary metric
- Conversion rate from cart to order
- Guardrails
- Revenue per visitor
- Customer complaints about stock accuracy
- Return rate
- Who should test it
- Stores with limited or variable stock, such as parts, drops or small batches. If your stock is always plentiful, fake scarcity can damage trust, so don't test it.
Questions
Do low-stock messages increase conversions?
They did here: Sparify's mobile conversion rate rose 16.49% after adding them.
Results depend on the messages being true and relevant.
Is scarcity messaging manipulative?
It can be if the numbers are fake.
Showing real stock levels gives shoppers useful information and keeps trust intact.
Where should stock messages go?
Close to the item they refer to, such as next to the cart line or on the product page near the add-to-cart button.
Similar tests
Clean Commit
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