iOSapp development services for iPhone and iPad.

We design, build and release native iOS apps in Swift and SwiftUI. You get a team that knows Apple's frameworks, review rules and release cycle, and an app your users open every day.
Discuss your iOS app

Your iPhone users expect an app that feels like it belongs there.

iOS users notice slow screens, odd navigation and broken gestures within seconds, and they say so in reviews. A native app built in Swift follows the platform's patterns, uses the hardware properly and passes App Review without weeks of back and forth. That is the work we do.

What makes iOS projects harder than they look

01

App Review rejections

A rejected build can push a launch by days or weeks, often for a guideline nobody on the team had read.
02

UIKit and SwiftUI in one codebase

Older screens in UIKit, newer ones in SwiftUI, and no clear rule for which to use next. The app gets harder to change.
03

Every new iOS version breaks something

Each autumn Apple ships a new iOS, new privacy rules and deprecated APIs. Apps that aren't kept current start to misbehave.
04

Subscriptions and payments are tricky

StoreKit, receipts, trials and restores have many edge cases. Small mistakes there cost real revenue.
05

iPad is an afterthought

A stretched iPhone layout on a large screen looks unfinished and earns poor reviews from iPad users.
06

Few senior Swift engineers to hire

Strong iOS developers are in demand, and one person alone can't cover architecture, UI, testing and releases.

Signs you need an iOS development partner

Any of these usually means the app needs more iOS depth than your team has today.

1

You're launching on iPhone first

Your early users are on iOS and you need a native app that looks and feels right from version one.

2

Your current app feels slow

Scrolling stutters, screens load late and users complain the app drains the battery.

3

Releases keep getting rejected

Builds bounce back from App Review and nobody is sure what to change.

4

You want to use new Apple features

Widgets, Live Activities, Sign in with Apple or Apple Pay are on the roadmap, but nobody has shipped them before.

5

Your iOS developer is leaving

The one person who knows the codebase is moving on, and the release pipeline lives in their head.

6

Your web product needs a native app

Customers ask for an iPhone app and a wrapped website won't meet their expectations.

What we build

iOS work you get from a Swift development company

New iPhone apps

Native apps in Swift and SwiftUI, from first prototype to the first App Store release.

iPad and universal apps

Layouts that use the larger screen properly, with split views, multitasking and keyboard support.

iOS UI/UX design

Screens that follow Apple's Human Interface Guidelines and still carry your brand.

Subscriptions and in-app purchases

StoreKit flows for trials, upgrades and restores, tested against the edge cases that cost revenue.

APIs and integrations

Connections to your backend, payments, analytics, maps and push notifications.

UIKit to SwiftUI migration

Moving screens to SwiftUI step by step, without freezing feature work.

iOS testing

Unit and UI tests plus manual QA on real iPhones and iPads before every release.

App Store release

Signing, TestFlight builds, store listing and App Review handled by people who have done it many times.

What a well-built iOS app gets right

We plan for these from the first sprint, not after the first bad review.

Native feel

SwiftUI or UIKit chosen per screen, with a clear rule

Platform navigation, gestures and haptics

Dark mode, Dynamic Type and accessibility

Layouts that work on iPhone and iPad

Speed and stability

Fast launch and smooth scrolling

Careful memory and battery use

Offline states that don't lose user data

Crash reporting from the first build

Smooth App Store releases

Guideline and privacy checks before submission

TestFlight builds for your testers

Automated builds and signing in CI

Release notes and store listing updates

Our iOS technology stack

Apple's own tools first, plus the backend and cloud services your app depends on.

Swift
SwiftUI
Xcode
GitHub Actions
CircleCI
Node.js
Python
PostgreSQL
AWS
Who is this for

Teams that need a strong iOS app

Startups launching on iPhone

You need a native app that impresses early users and investors, built without cutting corners you'll pay for later.

Product companies

Your iOS app is a main channel and needs senior engineers who can own features end to end.

SMBs adding a mobile channel

Your customers want an iPhone app for ordering, booking or account access.

Non-technical founders

You have the product idea and the market. We bring the iOS team and explain every decision in plain language.

Where can we help?

Build a new app

From idea and design to the first App Store release.

Add iPad support

Adapt an iPhone app to the larger screen properly.

Modernize the codebase

Move from UIKit and old patterns to SwiftUI.

Add Apple features

Widgets, Live Activities, Apple Pay and Sign in with Apple.

Extend your iOS team

Senior Swift engineers inside your existing team.

Keep the app current

Updates for each new iOS version and device.

How we take an iOS app from idea to the App Store

01

Discovery

We clarify users, core flows and integrations, then agree scope, priorities and a release plan.

02

Design

Our designers create flows and screens for iPhone and, where it matters, iPad, and test them with clickable prototypes.

03

Build in sprints

Swift engineers deliver working features every sprint, with TestFlight builds you can try on your own phone.

04

Testing

Automated tests and manual QA on real devices and iOS versions catch problems before your users do.

05

App Store release

We prepare the listing, privacy details and build, submit for review and handle any questions from Apple.

06

Updates

After launch we fix issues, ship new features and keep the app current with each iOS release.

How we work

Two ways to start your iOS project

Discovery Sprint

most popular

2 weeks, fixed price

Then a fixed-scope build or a dedicated team.

For new apps where scope, design and budget still need to be pinned down.

Workshops on users and core flows

Clickable prototype of key screens

Technical plan for the iOS app and backend

Scope, timeline and cost estimate

A plan you can use with any team

Book discovery

iOS team extension

Swift engineers join your team

Monthly, per engineer.

For companies with an iOS app and a backlog that needs more hands.

Senior Swift and SwiftUI engineers

You interview and pick each one

Work in your process and repositories

Code review and release support

Scale up or down as the roadmap changes

Add iOS engineers

iOS apps we've built and grown

subscription app

Flight Tracker+ — iOS subscription app

USA
Global
59%
growth of active user base
Before
→
after
↓
Rating declining
↑
Revenue €200K → €1.2M in 6 months
↓
Revenue stagnating at €200K
↑
Stable weekly release cadence
↓
Legacy codebase, original team gone
↑
Architecture rebuilt
↓
No clear path to recovery
↑
Clear path for future growth
EdTech

A mobile app to develop brain functions

4 mo
to a full iOS app on the App Store
Read the case study →

Make the most of the experienced team

We are a global team of
creative
and
strategic thinkers
who specialize in building custom digital products
from scratch. Our main goal is to
deliver high-quality solutions
that meet our clients' needs.
We are a global team of
creative
and
strategic thinkers
who specialize
in building custom digital products
from scratch. Our main goal is to
deliver high-quality solutions
that
meet our clients' needs.
Learn more
85%
recurring customers
12M
the biggest fundraising round by one startup
X3 MRR
growth of partner's business in 5 mos
2 weeks
for project start
5+ years
av. partnership duration with SMBs and product companies

Why Gilzor

We build iOS products for startups, SMBs and product companies, and we stay with them after launch. Most of our clients come back with their next app or their next big release.

What we bring

Mobile experience

7+ years building iOS and Android products.

Products in the market

70+ products launched for our clients.

On-time delivery

98% of projects delivered on time.

Quick start

Projects can start in about two weeks.

One team for the whole app

Design, iOS, backend and QA from the same partner.

What makes us different

Native by default

Swift and SwiftUI, not a web view dressed up as an app.

Release know-how

We plan for App Review from the first sprint.

Builds you can touch

TestFlight builds every sprint, so you see progress on your own phone.

Plain answers

If native iOS is the wrong choice for your budget, we tell you.

Overlap with US hours

Our engineers in Europe overlap with part of the US working day.

What our clients
frequently ask

Should we build native iOS or cross-platform?

Native Swift makes sense when the app relies on Apple-specific features, heavy animation or top performance, or when iPhone is your main market. If you need iOS and Android at once on a tight budget, React Native or Flutter can be a better fit. We'll recommend one after looking at your product.

Do you use SwiftUI or UIKit?

SwiftUI for most new screens, UIKit where it is still the stronger tool or where an existing app is built on it. In older apps we move to SwiftUI gradually, so feature work keeps going.

Will you handle the App Store submission?

Yes. We prepare the build, privacy details and store listing, submit for review and deal with any rejection. The app is published under your own Apple developer account.

Can you take over an existing iOS app?

Yes. We start with a review of the code, dependencies and release setup, then agree what to fix first. If the app is unstable, our mobile app audit is a good first step.

Who owns the code?

You do. The code lives in your repository and your Apple developer account from day one.

How is iOS development priced?

New apps usually start with a 2-week fixed-price Discovery Sprint, then a fixed price for the agreed scope or a monthly dedicated team. Team extension is billed monthly per engineer.

No sales pitch

Tell us about your iOS app

Share your idea or your current app and what you want to achieve. We'll reply with questions, a suggested approach and next steps.

Next, a few optional questions so the first call is useful. We use your details only to reply to your request. Privacy Policy