How to build an iPhone app: paths, tools and the App Store rules

What are your options for building an iPhone app?

There are three real paths. They differ in what you need to own, how much you learn, and whether you end up in the App Store.

Whichever you pick, you can write the code yourself, direct an AI coding agent, or use a builder. How to make an app compares those routes. This page covers what is specific to iPhone.

A note on web apps: Apple’s review guidelines say an app should include features, content and UI that go beyond a repackaged website, so wrapping a site in a shell and submitting it risks rejection. Build a web app as a web app. Build a native app only when it earns its place.

What do you need before you start?

• A Mac, for the native path. Xcode is Apple’s development environment and it runs on Mac. If you have no Mac, the web or a cross-platform framework with cloud builds are the realistic routes.
• An Apple Account, which is free. Apple’s membership comparison page says you can register for free and access resources such as beta versions of Xcode.
• An iPhone to test on. The simulator is fine at first. Real-device testing finds the problems the simulator hides: camera, touch, speed, poor connections.
• The Apple Developer Program, when you are ready to publish. Apple’s enrollment page says it costs 99 USD per membership year, with prices varying by region and fee waivers for eligible nonprofits, schools and government entities.
• One clear job for the app. Use the scoping guide before you open Xcode.

Apple’s membership page also states that to distribute apps you need to be a Developer Program member. Developers commonly report that an app installed on your own iPhone using a free account stops launching after about seven days and must be reinstalled, so treat that route as for learning, not for sharing.

How do you build a native iPhone app with an AI agent?

Xcode now supports AI agents inside the editor. Apple’s Xcode page says it supports interacting with code using the model of your choice, including coding models and agents from Anthropic, Google and OpenAI, and any agent compatible with the Agent Client Protocol. You can also use a terminal agent such as Claude Code against the same project folder. The AI coding agent guide covers the working method.

1. Create the project. In Xcode, make a new iOS app with SwiftUI. Run it in the simulator to confirm the empty app works.
2. Write the brief. One user, one job, the screens in order, what is out of scope. Use the template below.
3. Ask for a plan first. Have the agent list screens, data and files before it writes code. Correct the plan.
4. Build one screen at a time. Run it in the simulator after each step.
5. Read every diff. Look for hard-coded secrets, unused permissions and anything you did not ask for.
6. Move to your own iPhone. Plug it in, choose it as the run target, and use the app for a day.
7. Fix what real use breaks. Camera, location and notification prompts behave differently on a device.

Build a first version of an iPhone app called [name] using SwiftUI. Target the current iOS version and the latest stable Xcode.

User: [one specific person and when they need this].
Problem: [what they do today and why it fails].
Success: [the one thing the user can do].

Screens, in order:
1. [Main screen: what it shows]
2. [Input screen: what the user enters or captures]
3. [Result screen: what comes back]

Data: [what is stored, and where]. Store on the device only; no accounts, no servers.
Permissions: only [camera / location / none]. Explain why each is needed in the permission text.
Out of scope: sign-in, payments, push notifications, widgets, iPad layout.
Edge cases: no network, permission denied, empty result.

Before writing code, list the files and the SwiftUI views you will create, then wait for my go-ahead.
After each step, tell me how to run it in the simulator and what I should see.

A camera-first idea fits a phone well. One posted on the board, Photograph a parking sign and know if you can park here, would need the camera, a short text result and no accounts, which keeps a first iPhone version small. You can browse the board for more; each idea has a generated build prompt.

Should you use React Native and Expo instead?

If you want an iPhone and an Android app from one codebase, yes, consider it. Expo’s setup page lists two ways to run your project: Expo Go, which it describes as a playground for students and learners, and a development build, which is a build of your own app that includes Expo’s developer tools. Expo’s pricing page lists a free plan with up to 15 Android and 15 iOS builds each month, as of October 2026.

The trade is that you work in JavaScript or TypeScript and sit one layer away from Apple’s tools. Check that any iPhone feature your idea depends on is supported by the framework before you commit. The Android guide covers the other side of a shared codebase.

A no-code option exists too. Adalo says it publishes native iOS, Android and web apps from one project, and Thunkable says it builds native iOS and Android apps. See the no-code guide for the checks to make before you commit to a platform.

What does Apple check before an iPhone app goes live?

Apple’s App Review Guidelines are long, and most first apps are caught by a short list. Read the full document before you submit. These items from it are the common tripwires.

Apple’s App Review page says review typically covers at least 50% of submissions in under 24 hours and 90% in under 48 hours. Allow for a rejection and a resubmission anyway. The App Store publishing guide walks through submission itself.

How much does an iPhone app cost, and how long does it take?

Cash cost starts at USD 99 a year for the Apple program plus whatever tools you use. Self-built, that can total a few hundred in the first year. Hired, a simple app is thousands, since cost is hours times an hourly rate. The cost page shows the arithmetic with assumptions stated.

Time is hours divided by the hours you can spare each week, plus review. A simple app assumed at 60 hours takes about 6 weeks at 10 hours each week. See how long an app takes for a calendar table. If the scope is bigger than your spare hours, cut features before you add hours.

If you decide not to build it, you can still get the idea made: post it on the board. It is free and needs no account.