Add-ons are low-cost, low-friction products that enhance or protect the primary purchase, without adding a variant decision or requiring the shopper to think it over. A phone purchase gets a screen protector add-on, not a second phone.
This works because it targets a specific moment: the shopper is already at the payment step, has already committed to buying, and realizes there's one more small thing worth adding, provided it takes almost no effort to say yes. For an add-on to convert, it needs to be a single SKU with no variant choice to make, priced under roughly 15% of the cart's value, with a connection to the main item that's immediately obvious without explanation.
Setup: pick 1–2 staple SKUs per product line that don't require any variant selection, and show them as a single-tap add at the checkout step. Track which add-ons get the highest add rate by cart type, and prioritize those going into peak season.
Examples:
Fashion: A free personalization add-on, such as custom engraving, is offered right after the core purchase, adding no cost but raising the perceived value of the order.
Electronics: Gift wrapping and device protection are offered as simple checkboxes at checkout, priced at ₹99 and ₹199, with no variant decision required.
Health & Wellness: A membership add-on is offered alongside a free personalized diet plan as an added-value service at checkout.
Beauty & Personal Care: A "Special Treats" section surfaces small, low-cost add-ons directly in the cart, alongside a progress nudge offering a bigger freebie once one more item is added.