Quick answer
Top quantity break apps show tier cards or tables below add to cart, align checkout with the selected tier, and let merchants badge a recommended tier without editing theme code.
- Tiers must be visible pre-cart.
- Badge the recommended tier.
- Test widget-only path.
- Kitforge QB + kits + FBT.
Tier design best practices
Use two to four tiers. Anchor the middle tier as Best value. Keep economics above your margin floor — quantity breaks train stock-up behavior, not race-to-bottom pricing.
Mobile tier UX
Horizontal tier tables fail on narrow screens. Test radio_cards and compact_buttons in Kitforge preview before Black Friday traffic.
Widget-only discount testing
Add to cart from the tier widget during QA. Adding the same SKU via a theme shortcut should not silently apply the tier discount if widget-only is enabled.
When Kitforge is the right quantity break app
You want quantity breaks plus fixed kits or FBT in one subscription — common for consumables brands that also run gift sets quarterly.
Final recommendation
Pick quantity break apps on mobile PDP conversion — tier math is table stakes.
If you want this kind of offer to feel native to the buying journey, Kitforge Bundles is built around that exact problem: turning related Shopify products into clearer bundle offers before the shopper reaches checkout.
FAQ
Volume discounts vs quantity breaks?
Same economics — quantity breaks add PDP merchandising in Kitforge.
Native Shopify instead?
Possible at checkout without tier UI — see shopify-quantity-breaks-native-vs-app.