Mobile
iOS
Native iPhone and iPad apps, built to Apple’s grain and shipped through review by the same engineers who keep them running.
Overview
iOS is Apple’s operating system for iPhone and iPad, and building for it natively means writing an app that Apple’s own frameworks, hardware and distribution system treat as a first-class citizen. In practice that is Swift and SwiftUI for new work, UIKit where a screen needs control the newer framework does not yet give, all built in Xcode and shipped through App Store Connect. A native iOS app is not a website in a shell or a bridged runtime approximating Apple’s controls — it is a compiled binary that uses the real platform, so scrolling, gestures, animations, accessibility and system integration behave exactly as an iPhone owner expects because they are the platform’s own behaviours, not imitations of them.
The reason teams choose iOS first is rarely sentiment. Apple’s user base skews affluent, engaged and willing to pay, so for a great many consumer and subscription products the iOS audience is where the revenue and the early signal actually are. That does not make iOS the whole market — Android carries most of the world’s handsets — but it does explain why a startup validating a paid product, or a brand whose customers are concentrated on iPhone, will often build for iOS before anything else. We treat that as a commercial decision to make with eyes open, not a default, and we will show you the reach you are trading away as clearly as the audience you are reaching.
What native iOS buys you beyond feel is depth. The platform exposes capabilities — HealthKit, ARKit, the camera and Secure Enclave, widgets, App Clips, Apple Pay, biometric authentication, push notifications and Live Activities — that are available on the day Apple ships them, with no wrapper to wait for. When a product lives or dies on one of those, native is not a luxury. The honest boundary is equally plain: an iOS app reaches iPhone and iPad and nothing else, so if you need Android too, the real question is whether two native codebases or a cross-platform framework is the pragmatic call — and that is a conversation we have before you commit, not after.
Best for — Native iPhone and iPad apps where deep Apple-platform integration, best-in-class user experience, performance, or an iOS-first audience matter more than reaching Android from the same codebase.
Why teams choose iOS
A genuinely native experience
Because the app uses Apple’s real controls and follows the Human Interface Guidelines, every gesture, animation, transition and accessibility behaviour matches what an iPhone owner already knows. That familiarity is what makes a native app feel effortless where a bridged or wrapped one feels almost right and quietly wrong.
Full depth of the platform
HealthKit, ARKit, the camera and Secure Enclave, widgets, App Clips, Apple Pay and biometrics are available directly and on the day Apple ships them. For a product built around one of those capabilities, native access is not a nice-to-have — it is the reason the app can exist at all.
A commercially valuable audience
Apple’s user base is disproportionately willing to pay for and engage with software. For subscription and premium products that skew makes iOS-first a rational way to reach the customers who actually convert, rather than a compromise you settle for.
Why businesses choose iOS
- Your product needs to feel and perform like software Apple would have shipped, and an approximation through a cross-platform layer is not good enough for the experience you are selling.
- You depend on Apple-specific hardware or platform capabilities that only native access delivers properly, on the timeline Apple sets rather than a third party’s.
- Your audience or your revenue is concentrated on iPhone, and reaching those users well matters more, for now, than reaching every handset.
- You want honest senior counsel on iOS-first versus cross-platform, and on the Mac, developer-fee and App Store realities, before the budget is committed rather than after.
What we build with iOS
The capabilities this technology is genuinely strong at — and what we most often build with it.
SwiftUI and UIKit interfaces
We build new screens in SwiftUI — declarative, state-driven, less code — and drop to UIKit through representable wrappers where a screen needs control SwiftUI does not yet offer. Knowing exactly where that boundary sits, and building to the Human Interface Guidelines on both sides, is what keeps an app both modern and complete.
App Store submission and TestFlight
We treat App Store Connect, code signing, provisioning and the review process as part of the engineering, not an afterthought. Builds go out through TestFlight for real-device testing before submission, and we write release notes and handle review responses so a rejection is a conversation, not a crisis.
Push notifications and background work
We wire up the Apple Push Notification service properly, use background modes and background refresh where they earn their keep, and are disciplined about battery and system budgets. Notifications that arrive reliably and do not drain the device are a platform detail that separates a considered app from a leaky one.
Home-screen widgets, App Clips and Live Activities
WidgetKit widgets, lightweight App Clips for a slice of the app without a full install, and Live Activities for real-time status on the lock screen extend an app beyond its own icon. We build these where they serve the product, not to chase WWDC — each one has a maintenance cost worth spending deliberately.
Apple Pay, biometrics and the Keychain
We use Apple Pay for frictionless payment, Face ID and Touch ID for authentication, and the Keychain and Secure Enclave to hold credentials and secrets. These are the platform’s own trust primitives, and using them properly is both a security decision and a user-experience one.
Core Data, HealthKit and ARKit integration
Persistent local data through Core Data or SwiftData, health and fitness data through HealthKit, and augmented reality through ARKit and RealityKit are the kind of deep platform integrations native iOS exists to serve. We build against them directly, with the permission, privacy and consent handling the platform requires.
Use cases
Consumer and subscription apps
Customer-facing iPhone apps — media, fitness, finance, lifestyle — where polish, responsiveness and App Store quality drive retention and paid conversion, and Apple’s engaged audience is where the revenue is.
Health, sensor and hardware apps
Products built on HealthKit, Core Bluetooth, the camera or the motion sensors, where native access to Apple frameworks and the on-device privacy model is the entire point and a bridge would only get in the way.
AR and media-rich experiences
Augmented reality, real-time media, editors and games where ARKit, the camera pipeline and a compiled native binary deliver the performance and fine control that a cross-platform runtime struggles to match.
iOS-first product launches
Startups and brands validating a paid product on the audience most likely to pay, shipping a focused native iPhone app first and deciding on Android once the product has earned it.
When iOS is the right choice
- Your audience is concentrated on iPhone and iPad, or you are validating a paid or subscription product where Apple’s affluent, high-engagement user base is where the early revenue and signal actually sit. iOS-first is a defensible commercial call here, not a shortcut.
- The product depends on deep Apple-hardware or platform features — HealthKit, ARKit, the camera pipeline, the Secure Enclave, widgets, App Clips, Apple Pay, Live Activities — where native access on release day beats waiting for a cross-platform bridge to catch up.
- Performance and interface quality are load-bearing: media-heavy or graphics-heavy apps, real-time interaction, on-device processing, or anything where a genuinely native feel and a compiled binary are the difference between a product people keep and one they delete.
- Wrong for: needing iOS and Android from one team and one budget. A native iOS build reaches only Apple’s devices, so covering Android means a second native codebase — often the point at which Flutter or React Native is the more economical route, and we will say so plainly.
- Wrong for: a simple content or brochure app that a responsive website or a progressive web app would serve just as well. If there is no real reason to be on the device, the App Store fee, review overhead and Mac tooling are cost without return, and we will steer you away from it.
iOS: pros and cons
Strengths
- The most native possible feel and performance: real platform controls, compiled code, and behaviour that matches the device exactly rather than approximating it.
- Immediate, first-class access to every Apple framework and new OS feature the day it ships — no wrapper, plugin or bridge to wait on.
- A strong, well-understood security and privacy model — Keychain, Secure Enclave, biometrics, App Transport Security and sandboxing — available if you use the platform properly.
- An affluent, high-engagement audience and a curated App Store that, review overhead aside, gives users a trusted, low-friction way to find and pay for the app.
Trade-offs
- Apple-only reach. A native iOS app runs on iPhone and iPad and nowhere else — covering Android means a separate native build, which is exactly why the cross-platform question is worth asking up front.
- You need a Mac and an Apple Developer Programme membership. Building, signing and shipping iOS apps requires macOS and Xcode plus the annual developer fee, which shapes your hardware, CI and budget before a line of product code is written.
- App Store review sits between you and your users. Apple can reject or delay a release over guideline interpretation, and a time-critical fix can be held up by a queue you do not control — something to plan releases around, not wish away.
- Two native codebases are expensive. If you need iOS and Android, maintaining separate native apps roughly doubles the app work and the ongoing maintenance, which is often the moment Flutter or React Native becomes the pragmatic call.
Architecture
An iOS app’s architecture is mostly a question of where state lives and how the interface reacts to it. With SwiftUI we lean on the framework’s own model — a single source of truth in observable state, views as a function of that state — and structure the app around MVVM, keeping view models testable and free of view code so the interface stays thin and the logic stays checkable. We draw seams with protocols so the parts of the app that touch the network, storage or the platform can be swapped and tested in isolation rather than tangling into one object graph.
Offline behaviour is a decision we settle early, not a feature we bolt on. We choose a persistence layer — Core Data or SwiftData for structured local data, a lighter store where that is overkill — and design how the app reads from local state first and reconciles with the backend, so it stays usable on a train or in a lift rather than staring at a spinner. Larger apps we split into Swift packages so features build and test independently and the codebase stays navigable as it grows and more engineers touch it. The aim is an app where anyone new can trace any pixel back to the state that produced it and any change back to a testable seam.
Performance
A native iOS app is fast by default, but real-world performance is decided by how you use the main thread, not raw language speed. We profile with Instruments rather than guessing, keep work off the main actor so scrolling and animation never stutter, and are disciplined about SwiftUI view identity and body re-evaluation — where most SwiftUI performance problems actually originate. Launch time, frame pacing and responsiveness under real data are the bar we build to, because they are the bar users judge by.
Memory and battery are the other half of the story. Retain cycles, oversized image caches and undisciplined background work will grow an app until the system kills it or the battery complaints start. We watch allocations, break cycles, respect the platform’s background budgets, and are honest that a smooth demo on a new device is not the same as an app that stays fast through a long session on a three-year-old iPhone — which is the device that actually matters.
Security
iOS gives you a strong security and privacy model, most of which is available if you use the platform properly and squandered if you do not. We store credentials and tokens in the Keychain rather than in preferences or plain files, use the Secure Enclave and Face ID or Touch ID where the threat model warrants it, and enforce App Transport Security so network traffic is encrypted by default. The app sandbox and the permission prompts around location, contacts, health and the camera are boundaries we design with, requesting only what the product genuinely needs and explaining why.
Privacy is not just a security concern on iOS, it is a review and trust concern. We fill in App Privacy details honestly, handle App Tracking Transparency correctly, and keep sensitive data off logs and off third-party SDKs that do not need it. Authorisation is always enforced on the server; the client hides UI, it never holds the real decision. And we keep the dependency tree small and current, because a native app is only as trustworthy as the code you let into it.
Scalability
For a client app, scalability is about the codebase and the team more than request load — the backend carries traffic, while the app’s challenge is staying coherent as features, screens and engineers multiply. We modularise with Swift packages, keep feature boundaries clean, and lean on value types and protocols so parts of the app stay independent and testable rather than collapsing into one large controller. An app that is easy to reason about at ten screens is what lets you reach fifty without a rewrite.
The other axis is the platform itself. An iOS product rarely stays a single iPhone app — an iPad layout, a widget, a Watch companion or an App Clip tends to follow — so we keep model and business logic separate from the interface and shareable across those targets from the start. Where the app does heavy on-device work, Swift Concurrency lets it scale across cores safely. We plan for that growth up front, so the second target slots in rather than forcing you to untangle the first.
iOS integrations & ecosystem
The technologies we most often pair with it — each links to how we work with it.
How we work
We start by settling the decisions that are cheap to get right early and expensive to change later: the SwiftUI-and-UIKit split, the state and persistence model, how offline works, how the app talks to its backend — and, before any of that, whether native iOS is even the right call against your Android needs, your audience and your budget. Then we build in thin vertical slices: one real feature, running on a device and out through TestFlight, rather than a scaffold that demos well and does nothing on real hardware.
The engineers who design the app are the ones who write it, ship it through App Store review, and keep it running through OS updates and review-guideline changes. That is what we mean by operating what we build — decisions are made by people who will live with the maintenance and the review queue, so we favour boring, durable choices over whatever the last WWDC made shiny. You get typed, tested Swift, honest trade-offs, and an app your own team can pick up and extend.
The service behind it
Delivered throughMobile App DevelopmentWhat we build with iOS
The disciplines this technology most often shows up in — from a first build to taking over and stabilising an existing one.
How we deliver
- 01
Discover
We map the system, the constraints and the business it serves — including the parts nobody documented.
Architecture brief
- 02
Architect
Decisions get made, written down and defended before a line of production code exists.
Decision records
- 03
Build
Short cycles against working software. You see progress in the product, not in a status deck.
Shipping increments
- 04
Operate
Monitoring, incident response and iteration. The system is alive, so the engagement is too.
Runbooks & SLOs
Industries we use iOS in
Domain knowledge changes what gets built. A few of the sectors we know before the first meeting.
Also in Mobile
Why teams choose us for iOS
Senior engineers only
Native iOS work rewards experience — the retain cycle, the main-thread stall, the review rejection, the SwiftUI identity bug are all things you learn by shipping. The people building your app have shipped to the App Store before, and there are no juniors learning on your project.
We operate what we build
We ship through review and keep apps running across OS updates and guideline changes, so we optimise for the maintenance and review reality, not the demo — conservative choices and code your team can actually maintain.
Honest about iOS-first versus cross-platform
If you need Android too, or if Flutter or React Native would serve your budget better, we will tell you before you commit to two native builds. We would rather lose the work than sell you an app you did not need.
We handle the whole pipeline
Apple Developer Programme setup, provisioning, signing, TestFlight, App Store Connect and review are part of the job, not your problem to untangle. We take the app from an idea to live on the store and keep it there.
Typical timeline
- 01
Discovery and platform decision
One to two weeks agreeing the screens, integrations and data model — and confirming native iOS is the right choice against your Android picture, audience and budget before code volume grows.
- 02
First vertical slice on device
Two to three weeks delivering one real feature end to end, running on hardware and out through TestFlight, so the architecture is proven against a real iPhone rather than a plan.
- 03
Iterative build
Feature-by-feature delivery in short cycles, each testable in TestFlight, with performance, accessibility and crash-freedom checked as we go rather than bolted on before submission.
- 04
App Store submission and handover
Instruments profiling, tests on the load-bearing paths, signing and App Store Connect submission sorted, review responses handled, and documentation so your team can own and extend the app.
How pricing works
- Fixed-scope builds for well-defined apps — a specific iPhone product, an iPad companion, a focused MVP — quoted once we understand the screens, integrations and platform requirements.
- Monthly senior engagement for ongoing product work, where scope evolves across releases and you want continuity through OS updates, App Store cycles and review changes rather than a one-off deliverable.
- Focused audits and rescues for existing iOS apps — crash rates, performance, architecture, a stalled migration or a rejected submission — priced by the assessment.
Hire iOS engineers
Need iOS capacity on your own team? We embed named senior engineers into your existing team — reporting to your leads, working in your rituals — so you add capacity without a hiring cycle.
Hire iOS engineersCommon questions
Should we build native iOS or use Flutter / React Native?
It depends on whether Android matters and how native the app must feel. If your audience or revenue is concentrated on iPhone, or the product leans on deep Apple-platform features and a best-in-class feel, native iOS wins. If you need iOS and Android from one team and one budget, and the app is mostly standard screens and forms, Flutter or React Native is often the more economical call. We will work through it with you honestly rather than defaulting to two native builds.
What do we actually need to publish an iOS app?
A Mac to build and sign on, an Apple Developer Programme membership at the annual fee, and an App Store Connect account for distribution. We can build under your developer account or ours during development, but for a product you own we recommend your own account from the start so the app, its certificates and its reviews always belong to you.
How long does App Store review take, and can Apple reject us?
Review usually takes from a day to a few days, but it is a queue you do not control and Apple can reject a build over a guideline interpretation — payment rules, privacy disclosures, and thin or misleading functionality are common causes. We build to the guidelines from the start and handle review correspondence, so rejections are rare and, when they happen, are a conversation we resolve rather than a release-blocking surprise.
Do you build in Swift or Objective-C?
Swift for all new work — it is the language Apple is investing in, and its safety and modern tooling reduce whole categories of crash. We work in Objective-C when it is the reality of an existing codebase we are extending or migrating, and we can move a legacy app to Swift incrementally rather than demanding a risky big-bang rewrite.
Does the app keep working offline?
That is an architecture decision we make with you early, not a feature bolted on late. We can build the app to read from local state first — through Core Data or SwiftData — and reconcile with the backend when a connection returns, so it stays usable without signal. How much offline capability is worth building depends on the product, and we will scope it honestly against the cost rather than promising full offline for everything.
Building on iOS?
A technical conversation with the engineers who would do the work. If we are not the right fit, we will say so on the call.