The Hyvä Theme offers an optional add-on called Hyvä Checkout—a modern, fast, and highly flexible checkout solution designed to work seamlessly with the Hyvä frontend. It delivers a significantly better user experience compared to Magento’s default checkout, with faster load times, simplified code, and easier customization.

That said, if your store already uses a highly customized Magento checkout—especially one deeply integrated with third-party modules or business-specific logic—you can continue using the default Magento checkout alongside Hyvä. This gives you time to transition gradually or keep existing workflows in place if needed.

However, upgrading to Hyvä Checkout may present some integration challenges, particularly if your current setup includes:

• Complex third-party checkout extensions
• Custom shipping/payment logic
• Legacy JavaScript or Knockout.js dependencies

In these cases, additional development effort may be required to migrate or rebuild those customizations within the Hyvä Checkout framework. The good news is that Hyvä Checkout is built to be developer-friendly and extendable, making it a solid long-term investment for performance and flexibility.

In short: you’re not locked in—Hyvä gives you options depending on your business needs and development roadmap.