10+ years of app development
Everything from a single source
50+ successful app projects

iOS app development tailored to your business

Custom iOS apps with thoughtful UX, smooth performance, and robust technology—built by experts for iPhone, iPad, Mac, Apple Watch, or as a web application.

Schedule a free consultation

End-to-end delivery

Strategy, design, development, maintenance

Personalized apps

Tailored internal & customer-facing apps

Time & cost efficient

Modern stack & cross-platform expertise

Why partner with Cayas for your iOS app

In B2B, iOS is a strong bet. Companies that reach iPhone and iPad users win high-value audiences—provided they rely on stable, future-proof technology.

Cayas Software has delivered custom iOS apps for 12+ years across multiple industries. We pair thoughtful user experience with efficient engineering in .NET MAUI—so you can reuse a significant portion of your code across platforms without sacrificing quality.

Full-service support

From planning and iOS app design to launch and ongoing optimization, we’re your reliable partner end to end.

One app—many devices

We scope and build for iPhone, iPad, and Mac—or as a web app—so you meet users where they are.

Custom development

We plan, design, and build exactly what your business needs. You choose how our iOS team supports you.

Quality built-in

We leverage native APIs and platform best practices to ensure quality at every step.

Book a no-obligation discovery call
Sebastian Seidel, Managing Director, Cayas Software GmbH

Meet with our iOS app expert—free of charge

  • Get personal, practical guidance
  • Identify the right app technology
  • Receive clear recommendations
  • Turn your app idea into results
Book your free session

Your ideal iOS app in 4 steps

Delight your audience and your teams with a user-friendly iOS app.

  1. Discovery call
    Schedule a free, no-pressure consultation. We align on your goals, scope, and success metrics and outline a tailored concept for your iOS app.
  2. Concept & prototyping
    UX/UI design plus an early prototype show how your app will look and feel so you can validate quickly and refine with confidence.
  3. iOS development
    We bring design and functionality together with a focus on performance, usability, and pixel-perfect rendering across Apple devices.
  4. Launch & iteration
    We handle App Store release and support you afterward with updates, enhancements, and ongoing optimization.
Request a no-obligation consultation

Two engagement models

Turnkey delivery or team augmentation

Choose how we support you and your project—full ownership or embedded expertise.

Full-service delivery
Our team plans, designs, builds, and supports your iOS app beyond launch—owning the outcomes so you can focus on the business.

Expert as a Service
Plug our specialists into your existing team through go-live—ideal for accelerating timelines or closing skill gaps. In both models, we stay quality-driven and customer-obsessed.

No matter the model, our experts push your vision forward with energy and ownership.

Learn about flexible collaboration
Wireframe

Core areas of iOS development

For Apple users: custom iOS app engineering

We specialize in two high-impact domains: (1) internal apps that streamline operations and (2) customer-facing apps that extend your products and brand.

Of course, our experts also build other iOS app types—tailored solutions with foresight and care.

Modernization & migration

You don’t always need to start from scratch. We modernize existing apps and, with .NET MAUI, can extend them to Android while preserving functionality and UX.

The result: a future-proof codebase, wider reach, and a modern look and feel.

Discuss your iOS app — free consultation

We also deliver cross-platform and Android projects

Cross-platform with .NET MAUI
By leveraging .NET MAUI (the successor to Xamarin) for iOS development, we craft solutions that run across platforms. With XAML-based UIs, we work efficiently—often saving ~30% in development time and cost.

Learn more about .NET MAUI

Android app development
We don’t just build for Apple—we also deliver high-performance Android apps. Depending on the use case, we use Java, Kotlin, or .NET for Android to maximize efficiency and reliability.

Learn about Android development

Customer success stories

Big visions, smart ideas, shared success—why teams trust us:

Portrait of Sascha Willam
“As interim team lead, Sebastian Seidel not only laid a strong foundation for the Driver App—the team he handed over to me reflects his experience with people and technology.”
Sascha Willam Team Lead, Driver App, flaschenpost SE
Portrait of Kim Dallmer-Zerbe
“We knew Cayas from a prior workshop and decided to start a project together. The quality we received on the warehouse logistics app was absolutely professional.”
Kim Dallmer-Zerbe DSP Project Lead
Portrait of Andreas Kipp
“Cayas was a fantastic partner. Their passion and readiness to move fast—iterating until everything ran flawlessly—was clear throughout the engagement.”
Andreas Kipp Development Engineer, Class E-Systems GmbH
Make your iOS app a success story
SAP Logo
Claas Logo
techem Logo
DHL Logo
OBI Logo

FAQ

Frequently asked questions about iOS app development

Timelines vary by scope, but most projects take about three to five months from kickoff to launch. Smaller apps can ship faster; larger initiatives benefit from a bit more runway. Typical phases include:

  • Planning (1–2 weeks): We refine your idea and define clear requirements for design, performance, functionality, and quality.
  • Design & prototyping (3–4 weeks): An early prototype lets you experience the look & feel and shape the product sooner.
  • Technical development (6–12 weeks): Features and iOS UI come together in the build. Your app takes shape rapidly.
  • Quality assurance (3–6 weeks): Rigorous testing ensures everything runs smoothly before release.
  • App Store release: We guide the submission and rollout so your app is ready for users.

We build for all major Apple devices—iPhone, iPad, Apple Watch, Mac, and Apple TV—and we also deliver web applications. Our approach ensures stability on devices Apple actively supports.

Yes. Our designers and engineers follow Apple’s Human Interface Guidelines—from navigation and gestures to typography and spacing—so your app feels native and clears App Store review smoothly.

We offer comprehensive support across the lifecycle, including cross-platform development for iOS and Android—balancing quality and cost efficiency.

From idea to App Store, we align design, engineering, and QA so your project moves forward reliably. Our work ranges from warehouse logistics apps and embedded team support to project management and advisory.

Our services include:

  • iOS app design: Intuitive, brand-consistent interfaces based on Apple’s guidelines.
  • iOS UI engineering: Clean, scalable front ends that delight users.
  • iOS development: Modern, secure implementation using professional tooling.
  • Mobile testing: Multi-device testing for performance, stability, and reliability.
  • Flexible expert support: Full project ownership or targeted help—your call.
  • Team training: Workshops and coaching to level up your in-house capabilities.

With our full-service approach, you get a solution that wins with users and stakeholders alike.

We combine modern tech with years of experience. We build native apps with Swift and Objective-C, and cross-platform apps in C# via .NET MAUI (formerly Xamarin).

.NET MAUI lets us ship for iOS and Android without maintaining two completely separate codebases—saving time and cost while delivering great UX on every device.

Advantages for organizations building iOS apps with us:

  • Flexibility: Native or cross-platform, depending on your goals.
  • Efficiency: Professional toolchains (Xcode, Visual Studio) for iOS, iPadOS, macOS, tvOS, and watchOS.
  • Quality: Solid testing and adherence to Apple’s guidelines for reliable, App-Store-ready releases.

From iPhone UX to map integrations (e.g., OpenStreetMap) to complex business apps—we deliver solutions tailored to your audience.

We run structured testing across devices, OS versions, and real-world scenarios focusing on:

  • Performance
  • Usability
  • Security
  • Integrations & APIs

We detect and fix issues early—before your App Store launch.

If you need direct, frequent engagement, a native app offers clear advantages over a traditional website:

  • Optimized iOS UX: Purpose-built for iPhone and iPad.
  • Device capabilities: Camera, GPS, push notifications, microphone, and mapping integrations.
  • Personalization: Experiences tailored to each user.
  • Fast access: Launch right from the home screen.
  • Higher performance: Smoother, more reliable interactions.
  • New revenue: Subscriptions, in-app purchases, or ads.

With custom iOS development, you get a high-performance tool that keeps users engaged long term.

Absolutely. We regularly upgrade legacy iOS apps—improving security, performance, UX, and adding new capabilities. We also extend apps to Android when it makes sense.

Cost depends on scope, integrations, design depth, and future roadmap. A simple MVP costs less than an enterprise-grade solution with many features.

We provide transparent estimates with no hidden fees—so you have budget and timeline confidence from day one.

We’ve shipped a wide range of cross-platform apps, including:

  • Warehouse logistics: Optimizing internal processes for efficiency.
  • Driver apps: Safe, accurate navigation and delivery workflows.
  • Voice commands: Hands-free control for better usability.
  • Field service: Order management, reporting, and mobile workflows.
  • Customer portals & service apps: Ordering, support, and self-service.
  • Maintenance & technician apps: Smart on-site process control.
  • Marketing & product apps: Deeper engagement and brand experiences.

We blend modern iPhone design with engineering excellence—grounded in Apple’s guidelines and a rigorous testing & QA process.

Yes. We deliver iOS + Android efficiently with frameworks like .NET MAUI, sharing code where it makes sense without compromising UX.

That means faster timelines, lower cost of change, and a consistent experience across devices.

Cayas team

Let’s talk about your iOS app

Ready to build a new iOS app—or get expert support to finish strong?

In a free consultation, we’ll answer your questions, give candid feedback, and outline the best path forward.

  • iOS apps for B2B organizations
  • Transparent pricing
  • 12+ years, 50+ projects
  • Direct access to senior experts