A standard rung buys a set number of units at a tier price. A buy-X-get-Y-free rung is a distinct tier type: you enter how many units the shopper pays for (X) and how many are free (Y); Packtier makes the Y lowest-priced units in the pack free, based on the shopper's live variant choices. Buy-X-get-Y is available on every plan, including Free.
| Price mode | You enter | Example |
|---|
| Percent off the pack | a percentage | 10% off $59.98 → $53.98 |
| Fixed amount off the pack | an amount in your currency | $6.00 off $59.98 → $53.98 |
| Fixed price for the pack | the final pack price | you enter $53.98 |
Rounding - since a percentage rarely lands on a clean number, choose None (exact math), Down, Up, Nearest, or a Charm ending (.95 / .99).
Discount base - the discount is calculated from the compare-at price, the current selling price, or the price after an active Shopify discount. Pick this deliberately: it's the difference between “25% off the list price” and “25% off the already-discounted price”.
Combine discount across selected products (in Discount, next to rounding and discount base) sums the quantities of every targeted product together toward one tier ladder, instead of pricing each product on its own - so 1 unit of product A plus 1 unit of product B can together reach a 2-unit tier. Only percent and amount-off tiers work with this on; an exact pack price, a buy-X-get-Y tier, a free gift, and free shipping can't be reached this way, so none of those can be turned on for a tier while it's active - the buttons for them are greyed out.
A gift or free shipping a tier already had before you turned Combine on keeps working when a shopper buys exactly that tier's own quantity from that one product - Combine doesn't clear the setting. It just never adds that tier's quantity into a combined total from other products, and is never the tier a combined total resolves to.
The storefront still shows each product's own tier price - the combined discount is confirmed in the cart, not promised early on the page. Because of that, Combine also shows shoppers a short line under the tier header ("Combines with other items for extra savings" by default, editable right under the Combine checkbox, blank = built-in wording) so they at least know combining is possible, even though the widget can't say how many items they still need.
A tier can also add a free gift (every plan, including Free): pick a product and variant, and a quantity. The Discount Function zeros it and the checkout validation function confirms the gift in the order matches the tier you configured - a mismatched or duplicated gift is rejected before checkout.