iOS app development services for apps people keep using
iPhone users expect apps that feel fast, look polished and respect their privacy. Our iOS app development services cover the whole journey: shaping the idea, designing the screens, building the app, testing it with real users and getting it through App Store review. We build in Swift, or with Flutter or React Native when the same app also needs to run on Android, and we stay on after launch to keep it working with every new iOS release.
What iOS app development services include
Most of the work in a good app happens before the code. We define who the app is for, the one or two jobs it must do brilliantly and what can wait for a later version. Then we design the screens following Apple’s Human Interface Guidelines, so the app feels at home on an iPhone, and test the design with real people before building. A clickable prototype lets you and a few real users try the app before a line of code is written, which is the cheapest time to change your mind.
If you are looking for an iPhone app developer in NYC, we are a New York agency working with businesses across the US and the UK. The app is published in your own Apple Developer account, the code is yours once the work is paid in full, and the same team can build the backend, the website and the marketing that brings people to the app.
Signs you are ready for an iOS app
- Customers ask for an app by name
- Your service is used often, on the go
- A web app can’t do what you need
- You need phone features like camera or location
- Your current app is slow or out of date
What’s included in our iOS app development services
From the first sketch to the App Store and the updates after.
Product strategy
Users, goals and a first version scoped to what matters most, with a clear plan for later releases.
UX and UI design
Screens designed for iPhone and iPad, tested with users before development starts.
App development
Built in Swift, or with Flutter or React Native for a shared iOS and Android codebase.
Backend and APIs
Accounts, data, payments and integrations built and hosted securely.
Testing and TestFlight
Automated tests plus TestFlight builds you and your users can install and try.
App Store launch
Store listing, screenshots, privacy details and review submission handled for you.
iOS app development services in depth
Three things that decide whether an iPhone app succeeds after launch.
Getting through App Store review
Every iOS app is reviewed by Apple before it goes live. Common reasons for rejection include crashes, broken links, incomplete information, unclear in-app purchases and missing privacy details. We follow the App Store Review Guidelines from the start, prepare the privacy information Apple asks for and test every flow before we submit.
Privacy built in
Apple asks apps to explain what data they collect, and to request permission before tracking users across other apps. We collect only what the app needs, ask for permissions at the moment they make sense and write the privacy details accurately, which builds trust with users and reviewers.
Keeping up with iOS
Apple releases a major iOS update every year, and older devices drop out of support over time. We test each release in its beta, update the app before users notice problems and plan which iOS versions to support, so the app keeps working without costly emergency fixes.
How our iOS app development works
Discovery to launch in clear phases, with a progress update every week.
- Step 01
Discovery
Users, features and the first version agreed, with a scope and plan for each phase.
- Step 02
Design
Screens and prototypes designed and tested with real users.
- Step 03
Build and test
Development in short cycles, with TestFlight builds for you to try along the way.
- Step 04
Launch and grow
App Store submission, launch support and updates based on usage data.
Why Griffon for iOS app development services
One team designs the app, builds the backend, launches it and markets it, so nothing gets lost between agencies.
The app lives in your Apple Developer account. Once the work is paid in full, the design, code and accounts are yours.
Part of our Mobile app development ↗2 hours
our usual reply to a new inquiry, one business day at most
Weekly
progress updates, plus a monthly report with the data and the work done
One team
strategy, design, development and marketing under one roof
You own it
the design, code and accounts are yours once the work is paid in full
Questions about iOS app development services, answered
What do iOS app development services include?
Product strategy, UX and UI design, development, backend and APIs, testing with TestFlight, App Store submission and updates after launch.
Should we build native or cross-platform?
Native Swift suits apps that rely heavily on Apple features or need the best performance. Flutter or React Native suits apps that must launch on iOS and Android with one codebase. We recommend one after discovery.
Who owns the app?
You do. The app is published in your Apple Developer account, and the code is yours once the work is paid in full.
Can you help with App Store rejections?
Yes. We follow Apple’s guidelines from the start and handle any feedback from review until the app is approved.
How much does an iOS app cost?
It depends on the features, design and backend. We scope and price each phase before it starts, so there are no surprises. Ongoing support and updates after launch are priced separately, usually as a monthly plan.
Get a free app proposal
A 30-minute call. No deck, no pressure. Bring the site, the numbers and the goal, and leave with a plan and a price.