Which product should you offer as an upsell?
The product you choose matters more than the design of the offer. A beautiful popup with the wrong product sells nothing; a plain offer with the right one sells every day. Six rules to choose well.
1. It goes with what is already in the order
The offer should make sense next to the product that triggered it: socks with shoes, a case with a phone, a refill with a starter kit. If you have to explain why the two go together, pick another product.
2. It costs less than the main item
An add-on that costs a fraction of the order is an easy yes. An offer that doubles the order asks for a second full decision, and most customers will say no, especially after payment.
3. It needs no choice
Offers with a single variant work best. If the customer has to pick a size, a color and a scent, the one-click offer turns into a form. When the product exists in several variants, offer the one that suits most people, or the one that matches the item in the order.
4. It is in stock, and stays in stock
An offer on a product that sells out stops showing, or disappoints. Pick products with steady stock, and review your offers when your catalog changes.
5. The margin survives the discount
A discount makes the offer easier to accept, and it comes out of your margin. Work out what is left after the discount, the shipping and the payment fees before you set it.
6. Your own orders already voted
Your order history tells you which products are bought together. In Shopify, look at recent orders containing your best-seller and see what else appears in them. Those pairs are your first candidates, because customers have already made them without being asked.
A shortlist by type of product
- Consumables and refills: the easiest upsell there is, especially after payment.
- Accessories that complete the main item: cases, straps, cleaning kits, batteries.
- Care and protection: waterproofing spray for shoes, a screen protector, a fabric guard.
- Small gift items: wrapping, a card, a pouch, especially before the holidays.
- Travel sizes or samples of another product in your range.
What to avoid
- Products that need a decision: made-to-measure items, anything with a long description.
- Items heavier or bulkier than the main product, which can change the shipping cost.
- Gift cards after payment: Shopify does not let an app add one to an order that is already paid.
- The product the customer has just bought, unless a second one genuinely makes sense.
Then test
Rules narrow the choice; the numbers decide. Pick two or three candidates for the same trigger and compare them on revenue per view, not on acceptance rate alone. A cheap product that is often accepted can bring less money than a slightly more expensive one that is accepted a little less often.
FlatUpsell lets you put up to three products on the same post-purchase rule and tells you which one brings more revenue per view, once the difference is large enough to be more than chance.