Quantity breaks that make the second and third unit obviously worth it, with the discount applied automatically and the saving shown on the product page.

Set the tiers you want — 2 for 10% off, 3 for 20% — and let the shopper see the saving before they add to cart.
No discount code to communicate, no abandoned cart because a code did not work.
Combine a quantity break with a free gift that unlocks at the same tier, so the offer reads as one decision.
One click from the Shopify App Store. No theme edits, no code.
Choose the quantities and the discount for each step, on one product or a whole collection.
A/B test the tiers against each other and keep the version with the higher revenue per visitor.
You define the quantities and the discount for each step, on a single product or a whole collection.
Yes. A free gift can unlock at the same tier as the discount, so the offer reads as one decision for the shopper.
Yes. The saving is shown on the product page, at the moment the quantity is chosen.