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Build & Migrate

iOS App Development

Native iPhone apps, iPhone Duo ready.

100+Brands built and grown
2018On Shopify since
2Own brands we run
28Stores in the ledger

Native iPhone apps for ecommerce brands and the businesses behind them, built in Swift, connected to your Shopify store or your own systems, and laid out for every screen Apple ships, including iPhone Duo.

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Why it works

Why most brands do not need an app, and when they do

Most brands do not need an app. A fast store on a phone does most of what an app would, for a fraction of the cost to build and keep current. An app earns its place when it does something the website cannot: works offline, uses the camera properly, sends notifications people opted into, or gives your best customers a faster way back than a browser tab.

What you get

What our iOS app development covers

Apps for Shopify stores

A native app on the Shopify Storefront API, so products, prices, stock and checkout stay the store's own rather than a second copy somebody has to keep in sync.

Custom business apps

Customer apps and internal tools connected to the systems you already run, for the jobs a website does badly: working offline, the camera, notifications, the shop floor.

iPhone Duo and adaptive layout

Apps that resize between the outer and inner displays and move controls out of the fold, using Apple's own layout containers rather than screen sizes written into the code.

Fixing an app you already have

An audit of your current app on every iPhone size, iPhone Duo included, with the layout faults fixed in your codebase rather than a rebuild proposed by default.

How we work

How we build iPhone apps that hold up on every screen

01 · Scope

What the app has to do that your website cannot. If the honest answer is nothing, we say so before you spend anything.

02 · Design

Screens designed for small, standard and large iPhones from the start, with the outer and inner displays of iPhone Duo in the set.

03 · Build

Native Swift, tested in the simulator on every size and on real devices before anything goes to Apple.

04 · Release

App Store submission, answers to review, and a plan for the next iOS release rather than a handover and a goodbye.

The point

What it changes

  • Native Swift and SwiftUI, not a website in a wrapper
  • Your Shopify catalogue, cart and customer accounts inside the app
  • Layouts that adapt to every iPhone, including the folding iPhone Duo
  • App Store submission and the review back-and-forth handled

Context

Where this fits

When it does earn its place, we build it native, in Swift and SwiftUI, rather than wrapping the website. For a Shopify brand that means an app on the Storefront API, so the catalogue, prices, stock and checkout stay the store’s own. For a business with its own systems, it means an app connected to them directly, built for the job a website does badly.

Every app we build is laid out for the whole iPhone range from the first screen, including iPhone Duo, Apple’s folding iPhone, which went on sale in October 2026. Its outer display is phone-shaped and its inner display opens to almost twice the width, with a fold down the middle that Apple asks apps to keep controls out of. Apps built on fixed screen sizes are the ones that look wrong on it.

We have built iOS apps for clients under confidentiality, so you will not find them named here. Ask us on a call and we will talk through comparable projects in detail without naming the client.

Next step

Want this looked at on your store?

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Partners

Tools we have already run on our own stores.

The apps around a Shopify store decide as much as the theme does, and choosing between thousands of them is most of the work. We are a Shopify Plus Partner and we integrate the tools that sit around the platform. Every one of them runs on our own two stores before it reaches a client, so the recommendation you get comes from having paid for the thing and lived with it. When a brand already runs a stack that works, we integrate with it rather than rebuilding it to suit us.

How we use them

In their words

From start to finish, they were incredibly easy to work with. They understood the brief perfectly and delivered to a very high standard. Communication was excellent throughout, with quick and clear responses to any questions I had.
Tacky And UpsettingStore build or redesignShopify Partner Directory, April 2026

Questions

Straight answers

Do you build native iOS apps, or wrap our website?

Native, in Swift and SwiftUI. A wrapped website is cheaper to start and costs more later, because it inherits every limit of the web page inside it and adds the App Store’s review on top.

Will our existing app work on iPhone Duo?

It will open, but that is not the same as working. Apple asks apps to resize between the outer and inner displays and to keep controls out of the fold when the phone is partly folded. Apps built on fixed screen sizes are where that goes wrong, and we can audit yours and fix it in place.

Can a Shopify store have its own iPhone app?

Yes. We build on the Storefront API, so the app reads your live catalogue and hands off to Shopify checkout. Nothing is copied into a second system that somebody then has to keep in sync.

Can you show us apps you have built?

Our app work is for clients under confidentiality, so we do not name them on this site. On a call we will talk through comparable projects in detail, without naming the client.

More in Build & Migrate

Start a conversation

Tell us what the store needs to do.

UK and US brands buy this from the same senior team, and the American day is covered from the start of it rather than the end. How we work with US brands.

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