How to Build an E-Commerce App with AI
Contents
Last updated: August 2026.
Mobile commerce made up roughly 60 percent of US e-commerce transactions in 2025, and native apps convert around 3 times better than mobile web with meaningfully higher average order values. The "should I even build an app" question is mostly settled at this point. The real decision is which commerce platform to build around, and one rule that changes the entire cost picture compared to other app categories.
The rule that changes the cost math entirely
Unlike digital goods or subscriptions, physical products sold through an app don't have to go through Apple's or Google's in-app purchase system, and the 15 to 30 percent cut that comes with it. Apple's own guidelines explicitly carve out physical goods and services fulfilled outside the app, which is why apps like Amazon or Uber process payment through their own systems rather than Apple's. Stripe, PayPal, Apple Pay, and Google Pay (as payment methods, not IAP) handle this instead, with the platform wallets taking on most of the PCI compliance scope. This is the single biggest cost difference between an e-commerce app and the in-app-purchase-driven apps covered in our guide to adding in-app purchases, that guide's commission math doesn't apply here at all.
Picking a commerce platform to build around
| Platform | Best for | Tradeoff |
|---|---|---|
| Shopify | Most consumer retail | Custom checkout needs Shopify Plus |
| BigCommerce | API-first, larger retailers, B2B | Smaller ecosystem than Shopify |
| Magento (Adobe Commerce) | Enterprise-level customization | Real integration complexity |
| Custom / existing backend | Already running your own ERP or backend | No migration, but no platform tooling either |
Shopify integration typically runs through its Storefront API for catalog, cart, and authentication, plus the Mobile Buy SDK to complete purchases.
Headless commerce, and when it earns the extra complexity
Headless commerce decouples the app's front end from the commerce platform's backend, letting you build a fully custom mobile experience while Shopify, BigCommerce, or Magento still handles product data, cart, and checkout underneath. Shopify's own Hydrogen framework is the common middle ground here, and it's the scenario where a tool like Huxly is the most direct fit: generating the native front end in Expo, Flutter, or Swift that talks to Shopify's Storefront API, rather than using Shopify's own themed mobile output. It's not a default starting point, it's worth it when you need real design freedom, multiple sales channels sharing one backend, or integration with systems (ERP, PIM, CRM) a themed storefront can't accommodate. One documented example: a retailer that migrated to a headless setup saw a 12 percent increase in total orders and a 6 percent increase in average order value after the move, real numbers, but tied to a real customization need, not a guarantee for every store that goes headless.
What 2026 shoppers expect by default
Guest checkout is no longer optional, requiring an account before purchase is a reliable way to lose a sale at the last step. Buy-now-pay-later options (Klarna, Affirm, and similar) are now a standard checkout line item rather than a nice-to-have. A dynamic catalog that offers a "notify me" option on out-of-stock items, instead of just hiding them, keeps interested buyers instead of losing them silently. High-quality product media, zoom, video, and 360-degree views where relevant, closes more of the gap between browsing online and handling something in a store.
What this costs to build
No-code tools (Shopify's own mobile options, Glide, AppMySite, and similar) can produce a functional shopping app for $1,500 to $10,000, a reasonable way to validate early demand, though most growing brands outgrow these within 12 to 18 months as custom UI, deeper integrations, and scale start to matter. Custom development becomes the right call specifically when you need pricing or fulfillment logic no plugin handles, multi-market tax and currency support, one shared backend between your app and web store, deep ERP or warehouse-system integration, or you're building a multi-vendor marketplace rather than a single-vendor store. For a headless build specifically, generating the native shell through Huxly (flat $25 or $99 a month) instead of hand-coding it against Shopify's Storefront API is the main way this category gets cheaper than a from-scratch custom build, the commerce platform subscription and any ERP integration work sit on top of that either way. For the broader cost picture across app categories, see our breakdown of what it costs to build a mobile app in 2026.
FAQ
Do e-commerce apps have to use Apple's or Google's in-app purchase system?
No, for physical goods and services fulfilled outside the app. Apple's and Google's IAP requirements apply to digital goods and services consumed within the app, not to a physical product you ship to someone, which is why e-commerce apps process payment through Stripe, PayPal, or similar directly.
Which commerce platform should I build my mobile app around?
Shopify for most consumer retail, given its scale and standard Storefront API plus Mobile Buy SDK integration. BigCommerce for API-first or B2B needs. Magento for enterprise-level customization. A custom backend if you already run one and just need the app to integrate with it.
Is headless commerce worth it for a smaller store?
Usually not as a starting point. It earns its complexity when you need real design freedom, multiple sales channels on one backend, or integrations a themed storefront can't support, not by default for every store.
Can Huxly replace Shopify or BigCommerce as the commerce backend?
No, and it's not trying to. Huxly generates the native app itself, the part that talks to a commerce platform's API. Shopify, BigCommerce, or Magento still handle the actual product catalog, inventory, and checkout logic underneath, whichever tool builds the front end.
Is guest checkout necessary, or just nice to have?
Necessary. Requiring account creation before checkout is a well-established way to lose a sale right at the final step, and it's treated as a baseline expectation rather than an optional feature in 2026.
How much does a mobile e-commerce app cost?
No-code options run $1,500 to $10,000 and are reasonable for early validation, though most brands outgrow them within 12 to 18 months. For a headless build, generating the app through Huxly at $25 or $99 a month is meaningfully cheaper than hand-coding the same Storefront API integration from scratch.
Do I need to support Buy Now, Pay Later options?
It's close to standard in 2026 checkout flows. Klarna, Affirm, and similar options are commonly expected line items at checkout rather than a differentiating feature.
What's the real benefit of a native app over a mobile-optimized website?
Meaningfully higher conversion, roughly 3 times better in recent data, and higher average order value, largely from the smoother checkout, push notifications, and persistent cart that a native app supports and a mobile browser doesn't as reliably.
