Post-purchase accessory upsell: +3% AOV, 15% of orders add it
Commentary byLiftArchiveOur analysis, not theirsCooper's Treats started offering its treat-mold accessory right after checkout, and AOV rose about 3%, with over 15% of orders adding the accessory.
Founder Alex Willen set this up on the brand's own store, and it was published as an Upsell.com (formerly ReConvert) case study.
This was a before-and-after rollout, not a split test.
- Over 15% of orders now include the accessory add-on.
- About 3% lift in average order value.
- Founder reports first add-ons arrived within a day of launch.
- No control group, sample size or timeframe was shared.
The change
Variant adds a one-click accessory upsell after checkout.
Simplified mockup drawn by LiftArchive from the shared screenshots.
Control
No offer after purchase. The accessory was not pitched once the order was placed.
Variant
A one-click upsell and thank-you page offer for the treat-mold accessory, shown right after checkout.
Why it likely won
Our reading of the result, not the practitioner's claim.
- The mold is needed to make the frozen treats at home, so it fits the main product closely.
- Asking once, right after purchase, avoids cluttering the path to checkout.
- One-click acceptance removes the need to re-enter payment details.
- The AOV lift is modest because the accessory is likely cheap compared with the main order.
Caveats: Before-and-after result published by the app vendor, with no control group, sample size or timeframe. The store does five figures a month, so the numbers come from a small business.
Who ran it
Cooper's Treats ran this test for Cooper's Treats and published the results (Upsell.com (ReConvert) case study). The numbers are theirs; the summary and commentary on this page are ours.
Read the original case study on Cooper's Treats →
How to run this test on your store
- Hypothesis
- If we offer the product's companion accessory as a one-click upsell after checkout, then AOV will rise because buyers who just committed want to get the most out of what they bought.
- Primary metric
- Average order value
- Guardrails
- Refund rate
- Support tickets about duplicate charges
- Repeat purchase rate
- Who should test it
- Single-product or small-catalogue stores with one clear accessory. It won't help much if the accessory is already bundled or bought by most customers.
Questions
What is a one-click post-purchase upsell?
An offer shown right after payment that adds an item to the order without re-entering card details. The buyer just clicks to accept.
How much can a single accessory upsell raise AOV?
Here it was about 3%. The lift depends on the accessory's price compared with the main order and how many buyers need it.
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