Why attach rate matters
Accessories and add-ons usually carry the fattest margins in the catalog: the primary product wins the customer, the attachments make the money. Attach rate is that engine’s gauge, and moving it a few points, on traffic already bought and shipping already paid, is among the cheapest profit a store can find.
Raising the rate
- Pair by dataWhat actually gets bought together, not what should
- Offer at every altitudeProduct page bundles, cart add-ons, checkout bumps, post-purchase
- Frame as completion“everything you need to start” beats “you might also like”
- Track per primary productAttach lives at the SKU level, not the store level
Questions
Attach rate vs basket size: what’s the difference?
Composition versus count: basket size counts items per order, attach rate asks whether the right companion joined a specific primary purchase. A store can grow baskets with discounts while attach on its flagship stays flat, which is exactly the case the metric exists to catch.
What’s a good attach rate?
Category-bound and product-specific: high-consideration primaries with obvious companions attach far more than standalone goods. Benchmark each hero product against its own history, and let the best-attaching pair teach the merchandising for the rest.