Every upsell app promises a higher average order value. The ones that deliver it interrupt at the
Placement matters more than recommendation quality — an upsell before the purchase is committed risks the order you already had.
Post-purchase upsells are the safest position, because the original order is already banked when the offer appears.
Recommendation quality separates apps far more than feature lists do, and manual rules often beat weak automation.
Every upsell app adds page weight to templates that convert, so measure speed alongside average order value.
Post-purchase, on the thank-you page, is the safest and often the most profitable, because the original order is already complete and the offer cannot cost you it.
The full guide has the formats, the deadlines and the worked examples.