Best free Checkout - Other Shopify apps in 2026 [Updated]

The best free Shopify checkout apps help merchants customize their payment methods, add cash on delivery options, implement upsells, and optimize the entire checkout experience. From setting COD fees and order limits to displaying product properties and creating one-click checkouts, these tools give store owners complete control over how customers complete their purchases. Whether you need to hide payment options based on conditions, add post-purchase offers, or simplify order cancellations, these free apps provide essential features to improve conversion rates and average order value without any upfront investment.