iOS App Development Company: iPhone & iPad App Development Services

Updated September 2026 · Written and maintained by the Progression Agency strategy team

Progression Agency is an iOS app development firm building iPhone and iPad apps for businesses across the United States and worldwide. We design to Apple’s Human Interface Guidelines, build in Swift and SwiftUI or cross-platform when Android is needed too, prepare apps for App Store review, and support them through every annual iOS release.

What does an iOS app development company do?

It designs, builds, tests, publishes and maintains apps for iPhone, iPad and other Apple devices, including the backend services behind them and the App Store listing that presents them. Buyers who ask for custom iOS application development services are generally asking for software shaped around their own workflows and customers rather than a template app with a logo swapped in.

Our iOS app development services: iOS mobile app development services, iPhone mobile app development and iPad apps

Native iPhone app development in Swift

We build native apps in Swift and SwiftUI following Apple’s Human Interface Guidelines, so navigation, typography and gestures feel familiar to iPhone users.

iPad and multi-device apps

iPad apps use larger layouts, split view, keyboard shortcuts and Apple Pencil; we design them as their own experience rather than stretched phone screens.

Cross-platform iOS and Android

If you also need Android, React Native or Flutter reaches both stores from one codebase.

App Store submission

We prepare App Privacy details, screenshots, review notes and test accounts, submit through App Store Connect and handle reviewer feedback.

iOS app maintenance

Apple ships a major iOS release every year. We test beta releases in advance and update your app so it keeps working and can adopt new capabilities.

How does app development in iOS work?

iOS apps are written in Swift using Xcode and Apple’s frameworks such as SwiftUI and UIKit, tested on simulators and devices, distributed to beta testers through TestFlight and published through App Store Connect after App Review.

Getting through App Store review

Most rejections come from incomplete metadata, privacy details that do not match the app, missing account deletion, or in-app purchase rules. We check each against Apple’s App Store Review Guidelines before submission.

How much does iOS app development cost?

As a US price band, a simple iPhone app commonly costs $25,000-$60,000, a moderate business app $50,000-$130,000 and complex apps more. The Apple Developer Program costs $99 per year. When you weigh any iOS app development price, look at what sits inside it: design, backend work, testing on real devices, App Store submission and the first round of fixes after launch.

Apple’s App Store Small Business Program charges a 15% commission on paid apps and in-app purchases for developers with up to $1 million in prior-year proceeds. More in app development cost.

Hiring an iPhone app developer vs an iOS development firm: iPhone app development company, iPhone app development firm or iOS app development firm, and when to hire an iOS app developer

An individual iPhone developer can build a small app; a firm adds design, backend, QA, App Store compliance and maintenance across iOS releases. See hiring app developers.

How to compare iOS mobile app development companies

iOS mobile app development companies differ most in what they own end to end. Compare them on whether they build in Swift and SwiftUI, who handles App Store review, how releases are tested on real devices and what you receive at handover. Ask each company for a written scope, a build schedule with working versions along the way, and the names of the people who will do the work.

Why choose Progression Agency for iOS development?

• Native Swift and SwiftUI, or cross-platform when Android is needed.
• Design to Apple’s Human Interface Guidelines.
• App Store review preparation done up front.
• TestFlight betas every sprint.
• Launch marketing and App Store optimization.
• You own the code and developer account. Headquartered in New York City.

App Store submission requirements

Apple reviews every app and update before release. Planning for these requirements early avoids the rejections that delay launches by weeks.

Summarized from the App Store Review Guidelines and Apple’s privacy manifest documentation.

Which Apple platforms should your app support?

Most businesses start with iPhone. Other Apple platforms are worth adding when your users have a clear reason to use them, and SwiftUI lets much of the interface code be shared.

Beta testing with TestFlight

Every sprint ships to TestFlight, which supports up to 10,000 external testers, so stakeholders and pilot users try real builds before review.

Swift for app development: why we build iPhone apps in Swift

Swift is Apple’s language for iPhone mobile app development, and SwiftUI is its interface framework. Our Swift app development services use both for new apps, with UIKit where an existing codebase needs it. App developers for iPhone who work in Swift get first access to new iOS capabilities each year, which is why iOS app development firms that still ship Objective-C are becoming rare. Watch companions are built alongside; see wearable app development. Apple’s current iOS application development language is Swift, and a team that works in it daily will be comfortable with every new framework Apple introduces.

iOS app development companies in USA that build in Swift

When you compare iOS app development companies in USA, ask what the team writes new code in and who keeps it current each September when Apple ships a new iOS release. A Swift iOS app development company can usually show recent apps using SwiftUI, and can explain where UIKit still makes sense for older screens. Ask also whether designers, engineers and the person handling App Store submission sit on one team, since handoffs between three vendors are where schedules slip.

Frequently asked questions