Guides / How to build

How to Make an iPhone App (With or Without a Mac)

How to make an iPhone app: Swift and Xcode vs cross-platform vs a wrapped web app, Apple's Developer Program, TestFlight, review rules and costs.

Mythex Team · 2026-11-01 · 5 min read

To make an iPhone app, choose a way to build it (Swift in Apple's Xcode on a Mac, a cross-platform framework, or a web app wrapped for iOS by a builder that compiles in the cloud), join the Apple Developer Program, test the app through TestFlight, and submit it for App Review. You can make an iPhone app without owning a Mac if a service builds and signs it for you, but you always need your own Apple developer account. This guide explains each route and the Apple-specific rules that trip people up.

What's different about iPhone apps

Three things make iOS stricter than Android:

1. Signing is required. Every app installed outside development has to be signed with a certificate from an Apple developer account. There's no equivalent of sideloading a file onto a friend's iPhone.
2. Xcode only runs on macOS. Apple's tools for building and uploading apps need a Mac, unless someone else's Mac does the work.
3. Every App Store release is reviewed by people at Apple, against published guidelines.

None of this is a reason to avoid iPhone. It means you plan for an account, a review, and a test phase.

Three ways to build it

Native with Swift and Xcode

Swift and SwiftUI are Apple's own language and interface framework. You build in Xcode, run the app in the iOS Simulator, and install it on your iPhone by cable or wirelessly.

• Choose it when the app needs the best performance, the newest iOS features, widgets, or deep hardware access.
• Expect a Mac, months of learning if you're new, and a separate build for Android later.

Cross-platform with Flutter or React Native

One codebase produces both an iPhone and an Android app. You still need a Mac, or a cloud Mac service, for the final iOS build and upload.

A web app wrapped for iOS

A web app is placed in a native shell and built into a signed iPhone app. This is how Mythex makes iPhone apps. You describe the app in chat; Mythex builds it as a full-stack web app with a database and storage; you publish it; and on the Pro plan Mythex builds the iPhone app on its own Mac build machines, signs it with your App Store Connect API key and uploads it to your TestFlight. No Mac on your desk, no Xcode.

The honest limit: Mythex doesn't write Swift. The phone app opens your published app, so it suits apps whose screens work as web pages, like booking, portals, ordering, trackers and community tools, and it updates every time you publish.

Step 1: Join the Apple Developer Program

As of November 2026 membership costs 99 USD a year (prices vary by region). You can enroll as:

• An individual. Your legal name is shown as the seller on the App Store. You need an Apple Account with two-factor authentication.
• An organisation. Your company's name is shown. Apple requires a legal entity, a D-U-N-S Number (free in most places), a work email on the company's domain and a working website. Allow extra time for verification.

Accredited educational institutions can enroll with a fee waiver.

Step 2: Build the first version

Keep it to the core flow. A prompt for a small studio's class booking app:

Build an iPhone-first app for a yoga studio. Members sign up with email, see this week's class timetable (class name, teacher, time, spaces left), book a class or join the waiting list, and cancel up to two hours before. Members see their upcoming bookings on a second tab. The studio owner logs in on the web to add classes and see who's booked. Calm design, bottom tab bar, large buttons.

You can build this in the Mythex iOS app builder and try it in the live preview, then on your iPhone's browser once it's published.

Step 3: Design for Apple's expectations

Apple's guideline 4.2 says an app should go beyond a repackaged website. Practical ways to meet that:

• Make it a tool, not a brochure. Accounts, saved data and actions a user returns to.
• Lay it out for phones. A bottom tab bar, no tiny desktop menus, no pinch-to-zoom needed.
• Handle no connection gracefully with a clear message instead of a blank screen.
• Hide links that send users to a desktop website for core tasks.

Two more rules matter early. If the app lets people create an account, it must also let them delete it inside the app (guideline 5.1.1(v)). If it unlocks digital features or content for money, Apple requires in-app purchase (guideline 3.1.1).

Step 4: Create the app in App Store Connect

App Store Connect is Apple's website for managing apps. Under Apps, click + and New App, then enter the name, primary language, Bundle ID and an SKU (your own reference code). Apple doesn't let outside tools create this record, so you do it once by hand. On Mythex, the first iPhone build tells you the exact name and Bundle ID to use.

To let Mythex sign and upload builds, you create a Team key with the Admin role under Users and Access → Integrations → App Store Connect API, download the .p8 file (Apple lets you download it only once), and add it in the project with your Issuer ID. Mythex checks the key with Apple before saving it.

Step 5: Test with TestFlight

After a build is uploaded, Apple processes it, which typically takes a few minutes to half an hour. Then:

• Internal testers (up to 100 people on your App Store Connect team) can install it right away.
• External testers (up to 10,000 people, by email or a public link) need the first build in a group to pass a short beta review.
• Each build works for 90 days, then expires.

Install the TestFlight app on your iPhone, accept the invite, and test the main flow. Try it with large text, in dark mode, and with notifications turned off. Our beta test guide helps you find testers and collect feedback.

Step 6: Submit for App Review

Before you submit, you need screenshots, a description, a support URL, a privacy policy URL, App Privacy answers about the data you collect, an age rating and pricing. If the app needs a login, give Apple a demo account. Apple says it reviews at least half of submissions in under 24 hours and 90% in under 48 hours.

The full checklist and the common rejection reasons are in how to publish an app on the App Store.

Step 7: Ship updates

Native and cross-platform apps need a new build and a new review for every change. A wrapped web app is different: content and feature changes reach iPhone users when you publish the web app. You only need a new store version for shell-level changes such as the icon, name or permissions.

Costs at a glance

Where to go from here

If your users are mostly on iPhone, start here and add Android after. If they're split, read how to make a mobile app to compare approaches that serve both from one codebase, and how to make an Android app for the Google side.