Native app or cross-platform?

That depends on what the app needs to do. Native apps (Swift for iOS, Kotlin for Android) give the best performance and full access to the device. Cross-platform (React Native, Flutter, .NET MAUI) is faster to build and cheaper, because one codebase runs on both platforms. That is how we built Heumin. We will advise you on which option suits your app.

How long does it take to build an app?

A simple app is usually ready in 8 to 12 weeks. An app with its own backend, real-time features or many integrations takes 4 to 6 months. We work with a clear schedule and fixed milestones.

What does it cost to build an app?

We work on an hourly basis, so you pay for the time we actually spend on your app. The total depends on the features, the design and the number of platforms. After a free introductory call you receive a detailed estimate.

Do you help with publishing in the App Store?

Yes. We handle publication in the Apple App Store and the Google Play Store, including screenshots, descriptions and App Store Optimization (ASO). If Apple or Google ask for changes during review, we take care of it.

What about maintenance and updates?

An app needs regular maintenance for new iOS and Android versions, security updates and new features. We offer maintenance contracts, from bug fixes only to ongoing development.

Mobile app developmentApps for iOS and Android

We build apps for iOS and Android, from the first design to publication in the stores. Our own app Heumin runs on both platforms from one React Native codebase.

Apps for iOS and Android

We build apps from the first idea to publication in the App Store and Google Play. Our own app Heumin runs on iOS and Android from one React Native codebase.

Native iOS

Swift and SwiftUI, for apps that use everything iPhone and iPad offer

+ Swift & SwiftUI
+ Apple's Human Interface Guidelines
+ Core Data & CloudKit
+ Push notifications
+ In-app purchases
+ Face ID & Touch ID

Native Android

Kotlin and Jetpack Compose for Android apps

+ Kotlin & Jetpack Compose
+ Material Design 3
+ Room Database
+ Firebase integration
+ Google Play Services
+ Fingerprint and face login

Cross-platform

React Native or Flutter: one codebase for iOS and Android. This is how we built Heumin.

+ React Native & Flutter
+ Shared codebase
+ Screens that feel familiar on each platform
+ Native module integration
+ See changes instantly while building
+ Publishing in the stores

What we pay attention to

01
Security and privacy
Encrypted connections, secure storage on the device and no more data collected than needed
02
Backend integration
REST and GraphQL APIs, instant sync and working without a connection
03
Ease of use
Clear screens that users understand without explanation

How we build an app

01
Concept and planning
1-2 weeks
Recording requirements, exploring the audience and deciding on the technical setup
02
Design
2-3 weeks
Wireframes and clickable prototypes, adapted to iOS and Android
03
Build
8-16 weeks
We build in two-week sprints and show you what is ready after each one
04
Testing and launch
1-2 weeks
Testing on real devices, submitting to the App Store and Google Play and help with the launch

Average development time: 12-20 weeks

Book a free call See the demo

What you can expect from our apps

Features your users notice

Fast and smooth

Short load times and fluid screens on iOS and Android

One codebase

One codebase for iOS and Android with React Native or Flutter

Secure

Fingerprint or face login, encrypted storage and secured API connections

Push notifications

Targeted notifications that bring users back to the app

Works offline

The app keeps working without an internet connection

Device features

Camera, GPS, sensors, Bluetooth and NFC

Types of apps we build

For consumers and for businesses

Consumer apps

Apps for end users, like Heumin

+ E-commerce
+ Social media
+ Entertainment
+ Lifestyle

Business apps

Apps for your staff or business customers

+ Field service
+ Inventory
+ HR
+ Data collection

On-demand apps

Platforms that match supply and demand for services

+ Food delivery
+ Transport
+ Home services
+ Healthcare

IoT apps

Apps that control connected devices

+ Smart home
+ Wearables
+ Industrial IoT
+ Health monitoring

How we build an app

From idea to publication in the stores

01
Concept
User research, wireframes and technical requirements
02
Design
Mockups, prototypes and user testing
03
Build
Sprints and automated tests
04
Testing
Testing on real devices, a beta version and feedback
05
Launch
Publication in the stores, store listing texts and usage statistics

Native or cross-platform

The two ways to build an app, side by side

Native

Advantages

+ Best performance
+ Every platform feature
+ Familiar to users
+ Direct hardware access

Technologies

Swift (iOS) · Kotlin (Android) · SwiftUI · Jetpack Compose

Cross-platform

Advantages

+ Faster to build
+ Lower cost
+ One codebase
+ Same experience on iOS and Android

Technologies

React Native · Flutter · .NET MAUI · Expo · TypeScript

Try our apps

Test the demo app or download Heumin, our own app for iOS and Android.

Test the demo app Download Heumin

FAQ

Frequently asked questions

About having an app built

: That depends on what the app needs to do. Native apps (Swift for iOS, Kotlin for Android) give the best performance and full access to the device. Cross-platform (React Native, Flutter, .NET MAUI) is faster to build and cheaper, because one codebase runs on both platforms. That is how we built Heumin. We will advise you on which option suits your app.
: A simple app is usually ready in 8 to 12 weeks. An app with its own backend, real-time features or many integrations takes 4 to 6 months. We work with a clear schedule and fixed milestones.
: We work on an hourly basis, so you pay for the time we actually spend on your app. The total depends on the features, the design and the number of platforms. After a free introductory call you receive a detailed estimate.
: Yes. We handle publication in the Apple App Store and the Google Play Store, including screenshots, descriptions and App Store Optimization (ASO). If Apple or Google ask for changes during review, we take care of it.
: An app needs regular maintenance for new iOS and Android versions, security updates and new features. We offer maintenance contracts, from bug fixes only to ongoing development.

What our clients say

“Our new website is really fast, with load times of 1 second, and everything responds intuitively. Exactly what we had in mind.”

Sanimax

Website · Haarlem

sanimax.nl

“A complete solution with AI integration, from app to platform. We are very happy with the end result.”

Heumin

AI app · iOS, Android & web

heumin.com

“Within a week our website was completely redesigned and all funnels were correctly integrated. We are very happy with the result.”

ABN Vloerverwarming

Website & funnels · Haarlem

abnvloerverwarming.nl

Need custom software built

Book a free call with our developers. We look at your situation and discuss what's possible for your web application or business software. There is no obligation.

Book a free call

Mobile app developmentApps for iOS and Android

Apps for iOS and Android

Native iOS

Native Android

Cross-platform

What we pay attention to

Security and privacy

Backend integration

Ease of use

How we build an app

Concept and planning

Design

Build

Testing and launch

What you can expect from our apps

Fast and smooth

One codebase

Secure

Push notifications

Works offline

Device features

Types of apps we build

Consumer apps

Business apps

On-demand apps

IoT apps

How we build an app

Concept

Design

Build

Testing

Launch

Native or cross-platform

Native

Cross-platform

Try our apps

Frequently asked questions

What our clients say

Need custom software built