services - ios app development
iOS app development built for Apple's review bar.
Native Swift engineering built for Apple's review standards and design guidelines, from architecture through App Store launch.
// start here
Tell us what you're building
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definition
What is iOS app development?
iOS app development is the build of native software for iPhone and iPad, typically in Swift and SwiftUI, using Apple's own platform APIs for push notifications, camera access, and device hardware rather than a cross-platform approximation of them.
key takeaways
Searches for "ios app development" run around 6,890 a month in the US, concentrated among teams already committed to Apple's platform.
The global mobile application market was valued at $281.52 billion in 2024, on track for $626.39 billion by 2030 (Grand View Research, 2024).
Consumers spent $150 billion on in-app purchases and subscriptions across iOS and Google Play in 2024, up 13% year over year (Sensor Tower, 2024), with iOS users historically spending more per app than Android users.
You don't need Apple Developer Program enrollment sorted before you talk to us; we help set that up as part of the engagement.
// why App Store review shapes the build, not just the launch
Why does Apple's App Store review process matter this early, before a single screen is built? Because a submission built against Apple's Human Interface Guidelines from day one clears review faster than one retrofitted at the end. Apple's review bar is stricter than Google Play's but also more predictable once a team knows it, which is the tradeoff for the tighter hardware and software integration iOS gives an app in return.
capabilities - five
What our iOS team actually does.
Five capabilities, one goal: an app that clears App Store review and feels native the moment it opens.
- 01
Native Swift development
Swift and SwiftUI builds that use Apple's platform APIs directly, instead of a cross-platform shell that only approximates them.
- 02
App Store review and compliance
Store listing, Human Interface Guidelines compliance, and submission shepherded through App Store review, not handed off as your problem.
- 03
Apple ecosystem integration
Push notifications, Sign in with Apple, and CloudKit wired through Apple's own frameworks, not a bolted-on workaround.
- 04
Device and OS-version testing
Testing across iPhone models and current iOS versions, so the app performs the same on a two-year-old device as a new one.
- 05
Legacy iOS app modernization
Older Objective-C or early-Swift apps assessed and modernized toward current Swift and SwiftUI standards where it earns its cost.
method
How does an iOS engagement actually work?
A Syndell iOS engagement runs four stages: discovery and platform strategy, UI/UX design, native Swift development, and QA with App Store submission.
- 01
Discovery and platform strategy
// outcome
-> an honest read on whether iOS-first is the right call for your users and budget
- 02
UI/UX design
// outcome
-> screens designed against Apple's Human Interface Guidelines, not a generic template
- 03
Native Swift development
// outcome
-> a build using Apple's platform APIs directly, tested against real hardware
- 04
QA and App Store submission
// outcome
-> tested across devices, then submitted and shepherded through App Store review
technologies our iOS team builds with
- Swift
- SwiftUI
- UIKit
- CloudKit
- Firebase
- AWS
- Xcode
-- ios app development, in numbers --
global mobile application market size in 2024, projected to reach $626.39 billion by 2030 at a 14.3% CAGR
src - Grand View Research, 2024consumer spending on in-app purchases and subscriptions across iOS and Google Play in 2024, up 13% year-over-year
src - Sensor Tower State of Mobile 2025US searches for "ios app development" -- concentrated among teams already committed to Apple's platform
src - Google Keyword Planner via state/tier-assignment.csvrecent work
iOS apps that clear review and get kept.
clutch: 5.0/5 - google: 4.9/5
engagement
Which engagement model fits you?
| MVP build | Full native build | Legacy modernization | |
|---|---|---|---|
| Best for | Testing real demand on iOS before committing to the full feature list | A production iOS app built for App Store visibility and Apple's review bar | An existing iOS app that needs current Swift and SwiftUI standards |
| You get | Core features, scoped tight, live fast | Full native engineering, Apple ecosystem integration, App Store launch | An assessed codebase and a modernization plan, not a forced rewrite |
| Timeline | Weeks to a testable version | Months to a store-ready launch | Weeks to months, scoped to what needs to change |
We don't publish a pricing table here on purpose -- scope decides the real cost, and one conversation gets you a number a generic rate card never could. Tell us what you're building.
frequently - asked
About iOS
app development.
01Do you build in Swift, or Objective-C, or both?
Swift and SwiftUI by default for new iOS development, that is Apple's current recommended stack. We work in Objective-C when extending or modernizing an existing app built on it, rather than forcing an unnecessary rewrite.
02How strict is Apple's App Store review, really?
Strict and detailed, but predictable once you know it. We build against Apple's Human Interface Guidelines and App Store review guidelines from the start, which is why our submissions rarely bounce back on avoidable issues.
03Can you take over an iOS app that already exists?
Yes. Most engagements extend, rebuild, or modernize an existing iOS app rather than starting from a blank slate. We audit the current codebase first and tell you honestly what is worth keeping.
04Do you handle App Store submission and compliance, or just the code?
Both. Our QA and submission work includes shepherding the build through App Store review, not just a handoff of source code you have to figure out how to submit yourself.
05How much does iOS app development cost?
It comes down to scope: an MVP is a fraction of what a full native build runs. Published rate cards tend to mislead more than they help, so we skip them -- book a call for a real estimate against your requirements.
the practice
Need Android covered too? See our mobile app development practice for the full cross-platform picture, or our UI/UX design team if the interface needs to be scoped before development starts. Bring a developer directly onto your team through hire mobile app developers.
-- next issue - your iOS app --
Start your iOS app development project.
Tell us what you're building -- we'll tell you honestly what it takes to clear App Store review.
