Cross-platform app development cost for e-commerce & retail

There is no single figure, and quoting one would be the least useful thing this page could do — the same pairing spans several-fold depending on scope, compliance and how many surfaces you ship. What this page gives you instead is what the pairing demands: the regimes that may apply, the systems of record you will be asked to integrate with, the device matrix and the release path. The calculator below is already fixed to Cross-platform and e-commerce & retail — answer what is left and it returns a cost range, hours, timeline, team and running costs for your scope.

Because e-commerce & retail brings its own obligations before you write a feature: PCI DSS, ADA accessibility, CCPA / CPRA may apply, you will be asked to integrate with systems like Stripe and Shopify, and there are typically 6 distinct roles rather than one. The platform contributes its own separate costs — the device matrix, App Store & Google Play review — and those are independent of the industry.

In this model a single native app is the baseline. Two native apps cost about 1.7× that, because the second platform reuses the product thinking, API and design but repeats the implementation and its own test matrix. One cross-platform codebase costs about 1.24× the baseline plus fixed bridge hours. So against two native builds you save roughly 25–30% of client engineering — a real saving, but smaller than the "half price, one codebase" pitch suggests, because testing does not halve.

Flutter renders its own widgets, so the UI is highly consistent across platforms and animation-heavy interfaces behave predictably; the cost is that nothing looks natively platform-idiomatic unless you make it. React Native uses native components and shares language and often code with a web front end, which matters a great deal if you already have a React team. For a greenfield mobile-only product, Flutter is usually the more predictable build. For a team already writing TypeScript, React Native is usually the cheaper hire.

Use a platform unless you have a specific reason not to. Shopify plus a headless front end covers what most stores need, and it absorbs PCI scope, tax calculation and fraud screening. Build custom when your pricing, bundling or fulfilment logic cannot be expressed in a platform, when you are running a marketplace rather than a store, or when the buying experience itself is your differentiator. A common middle path is a platform for commerce plumbing and a custom app for the experience.

Against an existing web store, native apps typically add 50–70% rather than doubling cost, because the catalogue, cart, orders, payments and admin already exist — you are paying for client surfaces and store distribution. What you get is push notifications that actually reach people, saved payment with biometric confirmation, and better repeat-purchase behaviour. For a store with meaningful repeat purchase it is usually worth it; for a considered one-off purchase it usually is not.