Headless commerce separates your storefront from Shopify's theme layer: Shopify keeps handling products, checkout, and orders through its Storefront API, while your team builds the customer-facing site in whatever framework it likes. The pitch is total design freedom and app-like performance. The fine print is that you just signed up to build and operate a website forever.
What you actually gain
- Complete control of markup, interactions, and page architecture, with no Liquid constraints.
- Performance ceilings above what themes reach, when the build is disciplined.
- One commerce backend serving web, apps, kiosks, and whatever ships next.
- Content modeling from a dedicated CMS instead of metafields bent into shape.
What you actually pay
Everything a theme gave you free becomes your job: page rendering, SEO plumbing, preview environments, accessibility, and the long tail of edge cases themes solved a decade ago. Most Shopify apps integrate at the theme layer, so each one you rely on needs an API-level replacement or custom work. Marketers lose the theme editor unless you rebuild visual editing through a CMS. Budget realistically: the build is a mid five-figure project at minimum, and the ongoing engineering never ends.
A serviceable rule of thumb
Headless earns its cost when the storefront is genuinely part of your product, when content and commerce are deeply interwoven, when you serve multiple channels from one catalog, or when eight figures of revenue make each percentage point of conversion worth engineering salaries. If the honest motivation is a slow theme drowning in apps, fix the theme first; Hydrogen and modern Online Store 2.0 themes have narrowed the performance gap dramatically, and checkout stays Shopify-hosted either way.