Every good shopkeeper knows a small sweetener seals the sale.
Built by a merchant
I ran gift with purchase promotions on a busy, multi-currency Shopify Plus store for years. The apps behind them charged more in our best months, filled the catalogue with copies of our products, and now and then gave gifts away when they shouldn't have.
Sweetener is the app I wanted then: it does gifts and nothing else, it keeps your order data clean, and it costs the same whether you have a quiet month or a record one.
Darragh Verschoyle, founder, Ireland