Opus Cart Upsell Cart Drawer is a Shopify app that turns your cart into a tool for boosting sales without disrupting the shopping flow. It offers slide-out and sticky cart functionality, upsells, cross-sells, free gifts, rewards, countdown timers, announcement banners, free-shipping bars, discounts, notes, and express payment options. Merchants can customize what customers see based on location, device, language, or cart value. It supports multiple currencies and languages (English, Chinese Simplified, French, Spanish, Japanese). There is a free plan with essential features; paid plans add advanced rewards, abandoned cart analytics, more customization, priority support, and branding removal. The app works with modern Shopify themes and integrates with popular tools like page builders and subscription apps.