Upcharge Fees & Product Addons vs Upsell & Cross Sell — Selleasy: Shopify App Comparison (2026)

Key Features

• Apply klarna fees, credit card fees, fees payment, or a payment method fee
• Set a fee rule for a flat fee, cart fee, percentage fee, or extra fee
• Extra fees manager for mandatory fees, tariff surcharge & extra charge
• Link price addons, deposits and fees directly to your orders and fees
• Add a fee, cash on delivery fee, surcharge fee, or fees and surcharges

Key Features

• Pre-purchase cross-sell offers shown on product pages as Amazon-style "frequently bought together" bundles
• Post-purchase one-click upsell page with dedicated thank-you page funnels
• Cart upsell funnel with add-ons and product recommendations based on cart contents
• Multi-language and multi-currency support for international stores
• Customizable widget styling that auto-matches your store theme with no code changes required

Verdict on Upsell

Selleasy is one of the most well-rounded upsell apps on Shopify, offering pre-purchase, in-cart, and post-purchase funnels in a single install. Its generous free tier makes it ideal for new stores, while the paid plans remain affordable even for high-volume merchants. The app is easy to set up and integrates cleanly with most themes, making it a strong default choice for any store looking to grow AOV.