iOS App Development · Mumbai
iOS app development in Mumbai: iPhone and iPad apps built to Apple’s standards.
We design and build native iOS apps in Swift that feel at home on iPhone and iPad, pass App Store review and keep working as Apple ships a new iOS version every year. From product strategy to App Store launch and support, one in-house team in Andheri East.
What is iOS app development?
iOS app development is the process of designing, building, testing and publishing apps for Apple’s iPhone and iPad. Native iOS apps are written in Swift using Xcode and Apple frameworks such as SwiftUI and UIKit, follow Apple’s Human Interface Guidelines, and must pass App Store review before users can download them.
What does ABC Designs’ iOS app development service include?
ABC Designs, a digital agency in Andheri East, Mumbai founded in 2012, provides iOS app strategy, UI/UX design to Apple’s Human Interface Guidelines, native Swift and Flutter development, backend and API integration, testing on real iPhones and iPads, TestFlight beta testing, App Store submission and maintenance.
01 — Diagnosis
Why do iOS apps get rejected or lose users?
Apple’s review process and iPhone users’ expectations are both strict. These six problems cause most of the rejections and drop-offs we are asked to fix.
App Store rejection
What happens: launch is delayed by guideline issues: missing privacy details, broken links, incomplete features or login problems for reviewers.
How we prevent it: A pre-submission review against Apple’s App Store Review Guidelines, plus a demo account and notes for the reviewer.
Doesn’t feel like an iPhone app
What happens: Android-style navigation and controls that iPhone users find unfamiliar.
How we prevent it: Design to Apple’s Human Interface Guidelines: navigation, gestures, typography and haptics.
Privacy problems
What happens: unclear permission prompts or tracking without consent, which both users and Apple penalise.
How we prevent it: Accurate privacy labels, App Tracking Transparency where needed, and minimal data collection.
Breaks after iOS updates
What happens: features stop working after Apple’s yearly iOS release.
How we prevent it: Testing on iOS beta versions and an update plan ahead of each release.
Poor iPad experience
What happens: a stretched phone layout on a large iPad screen.
How we prevent it: Adaptive layouts for iPad sizes, orientation and multitasking.
Slow or battery-hungry
What happens: long launch times and heat on older iPhones.
How we prevent it: Profiling with Xcode Instruments and efficient background tasks.
02 — What’s included
Our iOS app development services
From a first iPhone app to modernising one you already have. Hire us for the full build or for one part, such as App Store submission or taking over an existing app.
Custom iOS app development
01iPhone and iPad apps built around your business, not a template.
- Requirements and feature scoping
- Architecture and technology choice
- Two-week build sprints
You get: Production-ready iOS app
Native Swift development
02Native apps for the smoothest experience and full access to Apple features.
- Swift and SwiftUI
- UIKit where needed
- Camera, location, Bluetooth and biometrics
You get: Native iOS codebase
iOS UI/UX design
03Interfaces that follow Apple’s Human Interface Guidelines and your brand.
- iPhone and iPad layouts
- Dynamic Type, dark mode, accessibility
- Clickable prototype
You get: Approved iOS design
Mobile app UI/UX design →Flutter cross-platform apps
04One codebase for iOS and Android when you need both.
- Flutter with shared business logic
- Native Swift modules where needed
- One release pipeline
You get: iOS + Android apps from one codebase
API & backend integration
05Connect your app to payments, CRMs and your own systems.
- REST APIs and Firebase
- Apple Pay, Razorpay and Sign in with Apple
- CRM and ERP sync
You get: Secure, documented integrations
API development & integration →Testing & TestFlight beta
06Find problems on real Apple devices before launch.
- Testing on real iPhones and iPads
- TestFlight beta groups
- Performance and security checks
You get: Release-ready build + test report
App Store submission
07Get approved and give your app a strong start on the App Store.
- Listing, screenshots and privacy labels
- Reviewer notes and demo account
- App Store Optimisation basics
You get: Approved App Store launch
Secure iOS development
08Protect user data and your business.
- Keychain storage and encryption
- Face ID and Touch ID login
- OWASP mobile security checks
You get: Security checklist passed
Migration & upgrades
09Bring an older or inherited iOS app up to date.
- Objective-C to Swift
- UIKit to SwiftUI
- Support for the latest iOS
You get: Modern, maintainable app
Maintenance & support
10Keep the app working through every iOS release.
- Yearly iOS readiness updates
- Crash monitoring and fixes
- Feature enhancements
You get: Monthly support plan
App maintenance & support →03 — Choosing your approach
Native Swift or Flutter: which is right for your iOS app?
Choose native Swift if your app depends on Apple-specific features or needs to feel perfectly native; choose Flutter if you also need Android and want one codebase. We recommend one during discovery and explain the trade-offs in writing.
| Native iOS (Swift) | Flutter (iOS + Android) | |
|---|---|---|
| Best for | Apps that rely on Apple features: Apple Pay, HealthKit, widgets, Apple Watch, AR | Consumer and business apps that need both iOS and Android |
| Platforms | iPhone, iPad and other Apple devices | iOS and Android (and web) from one codebase |
| Look & feel | Exactly native iOS | Close to native; needs care to feel fully iOS-like |
| New Apple features | Available as soon as Apple releases them | Usually after plugin support catches up |
| Cost if you need Android too | Higher: a separate Android app is needed | Lower: one team, one codebase |
| Long-term maintenance | One codebase per platform | One shared codebase |
Building for Android as well? See Android app development.
04 — Our process
How we build your iOS app, in six stages
Each stage ends with something you can see, install through TestFlight and sign off.
-
Stage 1 · Weeks 1–2
Discover
- Goals, users and competitors
- Feature list and version-one scope
- Swift or Flutter recommendation
Deliverable: Product brief + fixed-scope estimate
-
Stage 2 · Weeks 2–5
Design
- User flows and wireframes
- iOS UI to Apple’s guidelines
- Clickable prototype
Deliverable: Approved prototype
-
Stage 3 · Two-week sprints
Build
- App and backend development
- API, payment and Apple integrations
- Demo at the end of every sprint
Deliverable: TestFlight builds after each sprint
-
Stage 4 · Throughout
Test
- Real iPhone and iPad testing
- TestFlight beta with your team
- Performance and security checks
Deliverable: Release-ready build + test report
-
Stage 5 · Launch week
Launch
- App Store listing and privacy labels
- Submission with reviewer notes
- Response to any review feedback
Deliverable: Live app + full code handover
-
Stage 6 · Ongoing
Grow & support
- Crash and performance monitoring
- Readiness for each new iOS
- Plan and ship the next features
Deliverable: Monthly report + roadmap call
05 — Timelines
How long does it take to develop an iOS app?
A simple iOS app typically takes 6–8 weeks; a mid-sized app 10–16 weeks; a complex app with a custom backend 4–6 months or more. App Store review is usually quick, but plan a few days for it.
Simple app or MVP. A focused first version: a handful of core screens, login and a basic backend.
Mid-complexity app. User accounts, payments, notifications, an admin panel and a few integrations.
Complex app. Custom backend, real-time features, iPad and Apple Watch support or enterprise integrations.
Typical ranges from our projects, not a guarantee. App Store review time is extra. Bars are illustrative.
06 — Reporting
How we measure a successful iOS app
After launch you get a dashboard tracking these numbers, agreed with you during discovery.
| Metric | Why it matters | Source |
|---|---|---|
| Crash-free users | The share of users who never hit a crash. | Xcode Organizer / Crashlytics |
| Retention (day 1, 7, 30) | Whether people come back after downloading. | App Store Connect / Firebase |
| App Store rating & reviews | Drives downloads and shows what users love or dislike. | App Store Connect |
| Product page conversion | How many App Store page visitors download the app. | App Store Connect analytics |
| Launch time | Slow launches get apps closed and deleted. | Xcode Organizer / MetricKit |
| Battery & energy impact | Apps that drain battery get uninstalled. | Xcode Organizer |
| Release cadence | How often fixes and improvements reach users. | Release log |
07 — iOS apps by business type
What we prioritise depends on who will use your app
Premium & D2C brands
iPhone users are often a brand’s highest-value customers.
FOCUS · Polished UI, Apple Pay, loyalty features
Healthcare & wellness
Health data needs the highest privacy standards.
FOCUS · HealthKit, consent, secure storage
Fintech & BFSI
Users expect bank-grade security and instant login.
FOCUS · Face ID, encryption, clear transactions
International products
Many global markets are iPhone-heavy.
FOCUS · Localisation, App Store in multiple regions
Enterprise & internal apps
Staff apps distributed privately to company devices.
FOCUS · Private distribution, device management, SSO
Startups
You need investors and early users to see a polished product fast.
FOCUS · Lean MVP, TestFlight beta, analytics
08 — Our standards
How we work: what we always do, and what we never do
We build to Apple’s App Store Review Guidelines, Human Interface Guidelines and the OWASP mobile security standard, so your app passes review and feels right on Apple devices.
We always
- Design to Apple’s Human Interface Guidelines
- Check every submission against the App Store Review Guidelines
- Test on iOS betas before Apple’s yearly release
- Hand over source code, certificates and App Store Connect access in your name
- Collect only the data your app declares
We never
- Use private Apple APIs that get apps rejected
- Track users without their consent
- Ship a build that hasn’t been through TestFlight
- Hold your code or accounts to lock you in
- Hand your project to an outside team without telling you
09 — Pricing
How much does iOS app development cost in Mumbai?
iOS app development cost depends on the features and screens, native Swift or Flutter, iPhone only or iPad too, and the backend and integrations you need. Most clients start with a free consultation, then a short discovery phase that produces a prototype and a fixed-scope quote.
Discovery & prototype
A clear plan and a clickable prototype you can test, pitch or take to any developer.
- Discovery workshop
- Feature scope and user flows
- iOS UI/UX design + prototype
- Fixed-scope build quote
iOS app build
Design, development, testing and App Store launch of your app.
- Everything in discovery
- Swift or Flutter build
- Backend, admin panel and integrations
- App Store launch + code handover
Maintenance & growth
Keep the app healthy and improving after launch.
- Yearly iOS readiness updates
- Crash monitoring and fixes
- Monthly feature hours
- Usage report + roadmap call
What changes the price: number of features and screens · native Swift or Flutter · iPhone only or iPad too · backend and admin panel · Apple integrations (Apple Pay, HealthKit, widgets) · security needs.
10 — Technology
The technologies we build iOS apps with
Apple’s own tools and widely used frameworks, so your app is easy to maintain and hire for.
11 — FAQ
iOS app development: frequently asked questions
Have a question about your own app idea? Book a free consultation and we’ll answer it for your project specifically.
What is iOS app development?
iOS app development is designing, building, testing and publishing apps for Apple’s iPhone and iPad. Native apps are written in Swift with Apple frameworks in Xcode and released through the App Store after Apple’s review.
How much does iOS app development cost in Mumbai?
Cost depends on features and screens, native or Flutter development, iPad support, the backend and integrations. ABC Designs gives a fixed-scope quote after a short discovery phase; book a free consultation for a ballpark range.
How long does it take to build an iOS app?
A simple iOS app or MVP typically takes 6–8 weeks, a mid-complexity app 10–16 weeks, and a complex app 4–6 months or more, plus a few days for App Store review.
Do you build native iOS apps?
Yes. We build native apps in Swift with SwiftUI and UIKit, and cross-platform apps in Flutter when you need iOS and Android from one codebase.
Do you design for iPad as well as iPhone?
Yes. We design adaptive layouts that make proper use of the larger iPad screen, orientation and multitasking, rather than stretching the phone layout.
Will you publish my app on the App Store?
Yes. We prepare the listing, screenshots and privacy labels, submit the app with notes for Apple’s reviewer, and handle any feedback until the app is approved.
What if Apple rejects my app?
Rejections usually come with a specific guideline reference. We fix the issue or explain it to Apple through App Store Connect and resubmit. Checking against the guidelines before submission prevents most rejections.
Do I need an Apple Developer account?
Yes. The app should be published under your own company’s Apple Developer Program membership, which Apple charges an annual fee for. We help you set it up and add our team as developers.
Should I build for iOS or Android first?
In India most users are on Android, so many businesses start there. If your customers are premium, international or mainly iPhone users, start with iOS, or use Flutter to launch on both.
Can you build the iOS version of my Android app?
Yes. We can build a native Swift app that matches your Android features, or rebuild both in Flutter so they share one codebase.
Are iOS apps secure?
Apple’s platform has strong built-in protections, and we add to them: Keychain storage, encryption, biometric login and the OWASP mobile security checks before release.
Can you update or take over an existing iOS app?
Yes. We audit the code, crashes and reviews, then fix, modernise (for example Objective-C to Swift) or rebuild, whichever costs you less in the long run.
Do you provide support after launch?
Yes. Our maintenance plans cover updates for each new iOS version, crash monitoring, bug fixes, security patches and new features.
12 — Glossary
iOS development terms, explained simply
- Swift
- Apple’s modern programming language for iPhone, iPad and other Apple apps.
- SwiftUI
- Apple’s framework for building app interfaces in Swift.
- Xcode
- Apple’s development environment for building, testing and profiling apps.
- TestFlight
- Apple’s service for sending beta versions of an app to testers before release.
- App Store Connect
- Apple’s dashboard for publishing apps, managing releases and viewing analytics.
- Human Interface Guidelines
- Apple’s design guidance for apps on its platforms.
- Privacy nutrition label
- The App Store section that shows users what data an app collects and how it is used.
- App Tracking Transparency
- Apple’s rule that apps must ask permission before tracking users across other companies’ apps and websites.