Combora

Combora builds every bundle type merchants actually use: fixed packs, mix & match, volume discounts, BOGO, free gifts, build-a-box, frequently-bought-together and combos. Discounts are computed by Shopify Functions, so checkout totals are always exact, in every currency. Offers can be scheduled with start and end dates. Widgets render from your theme editor with no code, match your theme automatically, and every pack can be published in test mode so only you see it before going live.