Native iOS App Development
An iOS App Development Company That Clears App Review First Time
iOS punishes guesswork at the end. App Review reads your privacy manifest, your permission strings and your purchase flow as promises you already made. We build in Swift and SwiftUI, use the hardware people paid for, and settle the review questions while the app is still on paper.
Triple Protection Guarantee
- US-Registered Entity
- Signed IP Assignment
- Senior Engineers Only
Triple Protection Guarantee:
- US-Registered Entity
- Signed IP Assignment
- Senior Engineers Only
Years In Business
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Engineers On Staff
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Avg. Engineer Exp.
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Where iOS Trips You
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App Review Prep
Not Guessed
Senior Engineers
Vetted Only
Timezone Overlap
Live Hours
Privacy Rules
Set Up Front
Delaware LLC
US Entity
Hardware APIs
Used Properly
Crash Rate Budget
Every Merge
TestFlight Staging
Before Live
Store Listing
Compliant
IP Assignment
Signed
Delivery Overlap
Fixed
Hours
App & Team Owner
You
Trusted By Startups
What Our iOS App Development Company Does
An iOS app development company earns its fee where Apple is strict. App Review reads the privacy manifest, the permission strings and the purchase flow as commitments, and a guideline missed at design time becomes a rejection at submission. We write in Swift with SwiftUI, use the hardware an iPhone owner already paid for rather than working around it, and settle tracking, purchase and data questions before a screen exists.
Stallyons is registered in Delaware as a US company, and our engineers work a time-zone window agreed before the project starts, with four-plus hours of daily overlap. You sign a US contract, run diligence on a US entity and pay one US invoice. Behind the work sits twelve-plus years of delivery across six continents and around thirty-five engineers, averaging four-plus years of production experience. Product teams come to us when an iOS build has to satisfy App Review and a demanding audience at the same time.
What An iOS App Build Covers
Swift and SwiftUI as the default: a declarative interface layer, structured concurrency instead of nested callbacks, and a codebase the next engineer can read without unpicking a decade of Objective-C habits.
The hardware treated as a feature: Face ID, the camera and sensors, Core ML on the Neural Engine, HealthKit, widgets and Live Activities used where they earn their place rather than everywhere at once.
Privacy handled as engineering: App Tracking Transparency, privacy manifests, required reason APIs, nutrition labels and permission strings all written to match what the app actually collects and sends.
App Review anticipated rather than discovered: minimum functionality, purchase routing, account deletion and sign-in rules checked against the guidelines during design.
Quality you can inspect: code review on every merge, XCTest suites, TestFlight builds for your own team, and crash-free rates watched after each release.
One accountable vendor: one contract, one invoice and one entity for legal and finance to run diligence on, instead of a spread of contractors across four jurisdictions.
Why Buyers Screen An iOS App Development Company Hard
- Ask which App Store guidelines they expect to be tested against. A team that cannot name the usual rejection reasons has not been through review often enough.
- Ask who writes the privacy manifest and the nutrition labels. Both are declarations about your app, and a wrong answer there is a policy problem, not paperwork.
- Ask what happens at the next SDK and build target deadline. Apple raises the minimum every year, and updates stop being accepted without it.
- Ask how purchases are handled. Anything unlocking digital content usually has to run through StoreKit, and discovering that late rewrites your whole payment flow.
- Check the exit before you need it. The App Store Connect team, the certificates, the repositories and the analytics all sit in your own name from day one.
- Ask for the release plan. TestFlight groups, a phased release, a crash-free threshold that halts it, and a route back to the previous build agreed first.
How An iOS App Project Starts With Us
Every project starts with a free 45-minute scoping session. No slide deck, no sales script. You bring the product, the audience and the devices they carry; you leave with a build plan and a timeline.
We are selective about new projects and cap how many we run at once, because the scoping is the product. If App Review would reject the idea as you described it, we will say so first.
Why Clients Choose Us
Full
Written IP Transfer
USA
Contract Entity
Yours
Certs & Connect
Named
Delivery Lead
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Ready to build an iOS app that clears review?
What We Build For iPhone
The iOS App Development We Deliver
Every product is different and the underlying jobs repeat: design it, build it in Swift, use the hardware properly, connect it and get it through review. These are the iOS builds we deliver most often.
Native iPhone & iPad
Swift, SwiftUI, Human Interface
End-to-End
iPad Experiences
Split view, pencil, keyboard
Large Screen
Apple Watch Apps
Complications, workouts, health
On Wrist
Widgets & Live Data
Home screen, lock screen, alerts
Live In Production
Offline Mode
Core Data, CloudKit, sync
No Signal OK
In-App Purchasing
StoreKit 2, subs, entitlements
Charged
APIs And Integrations
REST, GraphQL, third-party SDKs
Linked
Device Test Coverage
XCTest, UI tests, real device passes
Sign-Off
Objective-C Rewrites
Migrations, UIKit into SwiftUI
Future-Proof
Support & Releases
Monitoring, fixes, store updates
Kept Running
Not sure which Apple surfaces you need? Let us map it.
Common Challenges
Why Do iOS App Projects Stall?
Six patterns behind almost every iOS app that gets rejected or rebuilt. Most are decided long before submission.
Review Surprise
01
The build is finished, then App Review asks why the app needs a permission, why a purchase bypasses StoreKit, or what a data type is used for. Each answer becomes a change, and each change is a new submission.
Privacy Declared Late
02
Privacy manifests and nutrition labels are written at the end from memory rather than from the SDKs shipping in the binary, so the declaration and the app disagree.
Thin App Rejection
03
An app that mostly wraps an existing website is treated as offering too little on its own. Repackaging a site rarely survives review without native value.
Payments Misrouted
04
Digital content is sold through an external checkout to sidestep the store commission. Review sends it back, and the fix is a rebuilt purchase flow rather than a setting.
Shipped Without TestFlight
05
The first real users are the public. A crash on one device family or one iOS version becomes a review score problem before the team has read the first report.
Apple Account Not Yours
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06
The App Store Connect team and the certificates sit in an agency account. Changing supplier becomes a negotiation, because the listing is not in your name.
Recognise a few of these? Let us do it properly.
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Our iOS App Services
6 Custom iOS App Development Services
Six ways to buy iOS delivery from one accountable vendor. Run one, or run several in parallel under a single contract.
Custom iPhone App Builds
01
End-to-end delivery of a defined iOS product: scope, design, build in Swift, test across the device families you support and submit, with a named lead who reports into you.
iOS Product Design
02
Interfaces built to Apple's Human Interface Guidelines for the screens your users actually hold, prototyped in Figma and handed over as SwiftUI components rather than flat images.
Objective-C To Swift Moves
03
Legacy Objective-C and UIKit screens moved to Swift and SwiftUI in stages, with the old screens running until the new ones have earned the switch.
Device Farm & QA Testing
04
Testing capacity that runs on your release cycle: XCTest suites, real device passes, TestFlight rounds before every submission and a written sign-off.
Backends & Integrations
05
The services behind the app, built by our own API development practice: REST or GraphQL endpoints, authentication, push and sync.
App Store Release & Support
06
Listing, signing, phased release, crash monitoring after launch, and the annual SDK and build target work that keeps your updates accepted by Apple.
Not sure which piece you need first? Let us scope it together.
Why Choose Us
What Makes Our iPhone App Development Company Different
The details that decide whether an iOS app clears review and keeps its rating afterwards.
A US Legal Entity
01
Stallyons is registered in Delaware. Your contract, your invoice and your legal recourse sit with a US company, not an unknown one.
Review Read First
02
We check the guidelines that apply to your app during design, so the questions review will ask are answered before the build starts.
Overlap You Set
03
You choose the hours we share with your working day, and stand-ups, reviews and escalations all happen inside that window.
Privacy By Design
04
Tracking consent, privacy manifests, required reason APIs and permission strings are written from what the app does, not from a template.
Reviewed Code
05
Every merge is reviewed against an agreed definition of done, on your board, where you can read it yourself.
One Contract
06
One contract covers the engagement, so procurement, legal and finance each deal with a single named counterparty.
Ready to see what a proper iOS build looks like?
Our Process
From First Call To iOS App Launch In Six Steps
A build process that settles privacy, purchases and review questions before any screens.
Discovery
Understand the users, devices and product goals
Scoping
Agree the device families, scope and cost
Design
Human Interface flows and SwiftUI components
Contracting
NDA, IP assignment, access and onboarding
Deliver
Built in Swift, reviewed on merge
Release & Tune
TestFlight, phased release, then crash data
Want to see how this maps to your roadmap?
Technology Stack
What Our iOS App Development Team Works With
The languages, frameworks and Apple services we build iOS products on, and the tooling that ships them.
Language & UI
Swift Concurrency
SwiftUI Views
UIKit Interop
Objective-C
Async/Await
Data & Offline Storage
Core Data DB
Background Tasks
CloudKit Sync
Keychain
URLSession & REST
Apple Devices
iPhone & iPad
Apple Watch UI
Apple TV And tvOS
CarPlay Apps
Widgets & Live Data
Store & Billing
Connect Portal
StoreKit 2
TestFlight
Privacy Manifests
Firebase Suite
Build & Deliver
Xcode Build Tools
XCTest & UI
Crash Reporting
GitHub Actions / CD
Datadog Monitoring
Who We Build This For
Custom iOS App Development For Every Kind Of Product
Eight kinds of product with different users and one shared need: an app that feels native on the device it runs on.
Retail & Commerce
Catalogue, checkout, loyalty
Fintech & Banking Apps
Payments, KYC checks, Face ID
Health & Wellness
HealthKit, wearables, records
EdTech & Learning
Courses, offline lessons, tests
Travel & Hospitality
Booking, itineraries, Wallet passes
Food & On-Demand Apps
Orders, tracking, driver app
Enterprise & Field
MDM, SSO, offline workflows
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Capability App Template Shop In-House Generalist Freelance iOS Dev Stallyons
Technologies App Review readiness ✕ Found at submission Learned on the job Depends who you get Guidelines read at design Privacy manifests and tracking ✕ Copied template Written from memory Partly handled Matched to shipped SDKs Purchase routing and StoreKit External checkout Decided late Sometimes included Routed before build starts Device family coverage ✕ One phone size Whatever the team owns Simulator mostly Agreed from your analytics Swift and SwiftUI codebase ✕ Template output Mixed with old UIKit Varies by developer Reviewed, tested, documented Backend and integrations ✕ Out of scope Separate team Simple endpoints Built alongside the app App Store Connect ownership Varies Your own account ✕ Held by the developer Yours from day one
| Capability | App Template Shop | In-House Generalist | Freelance iOS Dev | Stallyons Technologies |
|---|---|---|---|---|
| App Review readiness | ✕ Found at submission | Learned on the job | Depends who you get | Guidelines read at design |
| Privacy manifests and tracking | ✕ Copied template | Written from memory | Partly handled | Matched to shipped SDKs |
| Purchase routing and StoreKit | External checkout | Decided late | Sometimes included | Routed before build starts |
| Device family coverage | ✕ One phone size | Whatever the team owns | Simulator mostly | Agreed from your analytics |
| Swift and SwiftUI codebase | ✕ Template output | Mixed with old UIKit | Varies by developer | Reviewed, tested, documented |
| Backend and integrations | ✕ Out of scope | Separate team | Simple endpoints | Built alongside the app |
| App Store Connect ownership | Varies | Your own account | ✕ Held by the developer | Yours from day one |
Media & Entertainment
Streaming, downloads, AirPlay
Working in another sector? See all industries we serve.
How We Compare
Your iOS App Development Options, Compared
An honest look at your four delivery options.
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See the difference for yourself
Complete Engagement
Everything Included In Your iOS App Development
From Scoping to Contracting to Delivery, One Vendor
Here is everything included when you build your iOS app with us:
One iOS App Build Price: No Hidden Fees, No Surprises.
Every iOS engagement includes all eight components above. One contract, one senior team, one predictable cost, and no vendor sprawl.
🔒 No obligation. We'll deliver a detailed proposal within 48 hours.
Plus, Get These Free Bonuses
Free iOS App Review
A written read on your review exposure, privacy declarations, purchase routing and release process, with the fixes ordered by what blocks you first.
Included Free
Build Plan And Estimate
A phased build plan with scope, milestones, the integrations it needs and a transparent, itemised estimate for the engagement.
Included Free
Free Vendor Checklist
The questions we would ask any iOS app development company about review, privacy, purchases and releases, so you can test us too.
Included Free
Risk-Free Partnership
Our iOS Development Promise
We stand behind every engagement with commitments that protect your investment.
01
Scope Agreed First
Scope, model, working hours and cost structure are written down and agreed before contracting, so nothing is discovered later.
02
Built to Last
Senior developers, code review, automated tests, security and accessibility audits, and clean, documented code you fully own.
03
IP And Access Protected
NDA and IP assignment are signed before access, permissions are scoped per person, and your accounts stay under your control.
Start your iOS build with confidence, backed by our Triple Protection Guarantee.
Track Record
Engagements That Ship, Scale, and Compound
500+
Projects Delivered
29+
Service Categories
81%
Repeat Client Rate
4.9 ★
Clutch Rating
"Stallyons took our Figma design and built it into a live web application, a cognitive game with level-based match play, messaging, a tutorial, and a directory that ranks users nationally. What impressed me most was their grasp of the code behind that logic, and the quality of the experience. Delivered on time with steady updates."
Jerry L.
Founder
PicCiti LLC
"We brought Stallyons in to absorb an overflow of work, and they delivered ten iOS and Android apps, from reporting to geo-location for logistics, plus several backend systems, owning design, development, and app-store submission. Everything stood out: code quality, speed, and reliability. Perfect code, on time, adopted company-wide."
William B.
Director
Amplo Solutions
FAQ
Frequently Asked iOS Development Questions
An iOS app development company handles the parts of the platform where Apple is strict. It reads the App Store review guidelines that apply to your product during design, writes the app in Swift with SwiftUI, declares privacy accurately through manifests and nutrition labels, routes digital purchases through StoreKit, and uses the hardware people already paid for rather than working around it.
Native means the app is written in Swift against Apple’s own frameworks, so every API, sensor and interface behaviour is available the day Apple ships it. Cross-platform means one codebase serving iOS and Android through a shared framework, trading some platform depth for a single team and release cycle. Native suits products where hardware access, animation quality or Apple conventions decide the experience. If you are weighing the two, read our cross-platform app development page.
Cost follows the number of screens, which device families you support, how much sits behind the app as backend work, and whether purchases, offline mode or health data are involved, so a figure before scoping is guesswork. Review-sensitive features move it more than screen count. We scope first, then price, and itemise every phase.
Ask which App Store guidelines they expect to apply and which rejections they have handled. Ask who writes the privacy manifest and where purchase routing was decided. Ask who owns the App Store Connect team and the signing certificates. Then ask how a release is staged and what crash-free rate halts it. The answers show whether iOS is a specialism.
You do, from the first day. The App Store Connect team, the signing certificates, the repositories and the analytics are registered in your name, and NDA and IP assignment are signed before anyone gets access. Everything written on the engagement is assigned to you outright, with no licence-back.
We agree the supported range before code, taken from your own analytics rather than a default. That usually means a minimum iOS version, the iPhone and iPad sizes your users carry, and any watch or TV surface in scope. Testing runs on real hardware alongside the simulator, because performance and camera behaviour differ.
By reading the guidelines before writing the submission. Permission strings explain the real reason, the privacy manifest matches the SDKs in the binary, digital purchases run through StoreKit, and account deletion and sign-in rules are built in. Where a rejection looks likely we raise it during scoping instead.
Often, and they are separate builds rather than one job done twice. The platforms differ in review rules, background behaviour and design conventions, so we scope them together and sequence them, usually shipping one first and applying what launch teaches to the second. The Android side is covered on our Android app development page.
Still have questions? Let's talk.
Schedule an appointment with us today!
Ready To Build An iOS App That Clears Review?
Get a free consultation. We will walk your product, name what App Review will question, and send a written proposal.
