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Web development – web apps, PWAs and mobile applications for businesses

Web or mobile: which platform fits your product?

Choose between a web app, PWA and mobile app by reach, offline work, device features and operating model. We then deliver the selected channel on a shared, maintainable backend.

For mid-sized companies: compare reach, offline use, device features and operations—then deliver the right web app, PWA or store app – delivery and project ownership from Germany (Leer/East Frisia), named contacts, no offshore guesswork.

250+ projects · 5.0 on Google · 100% in Germany
  • 250+ delivered projects
  • 5.0 stars on Google
  • 100% engineering in Germany

Web or mobile is a product decision. Reach, offline use, device capabilities, distribution and operations determine the platform—not a preferred framework.

Web app, PWA or native app: decide by usage context

A web app fits browser access, central releases and SSO. A PWA adds installable use and limited offline support without a store. Native or cross-platform apps fit when push, camera, Bluetooth, background work or robust offline workflows are critical. For marketing sites use our website and portal development; for browser-based business systems use web app development; and for store distribution, push and device access use mobile app development.

Web development at Groenewold IT Solutions means delivering digital applications for mid-market organisations—web apps, PWAs and mobile touchpoints from one team. Web and mobile development is not a vague “something with apps” label for us: it is user flows, integrations and operations that leadership and IT can justify. When you need custom software development with written scope and releases, we translate RFQ language into backlogs, UX reviews and CI/CD—not slide decks alone.

Mobile app development costs include concept, UI, build, test, store lifecycle and maintenance—a realistic ongoing percentage of the initial investment keeps stores and OS updates stable. For marketing websites and portals see web development (sites & portals); for browser-based business applications see web app development. Interface concepts, prototypes and usability testing are covered by our UX design service, which we run before the build whenever screens carry complex business logic. Next step: structured discovery, then roadmap and a transparent estimate.

App development – native and cross-platform apps for iOS and Android

Your Digital Presence

In today's digital world, a professional presence on all devices is essential. We develop customized websites, web applications and mobile apps that are not only visually appealing but also technically state-of-the-art.

Our solutions are responsive, user-friendly and search engine optimized. We place great emphasis on performance, security and accessibility to provide your users with an optimal experience.

Whether corporate website, online shop, complex web application or native mobile app – we implement your requirements with the latest technologies and ensure that your digital presence contributes to your business success.

Our Web & Mobile Development Services

Responsive Web Design

Modern websites that are optimally displayed on all devices and offer an excellent user experience.

  • Mobile-First Approach
  • Optimized Performance
  • Accessibility

Native App Development

Powerful native apps for iOS and Android with optimal performance and access to all device features.

  • Swift and SwiftUI for iOS
  • Kotlin and Jetpack Compose for Android
  • Seamless Integration with Device Hardware

Cross-Platform Development

Efficient development of apps for multiple platforms with a shared codebase.

  • Flutter and Dart
  • React Native
  • Faster Time-to-Market

Content Management Systems

User-friendly CMS solutions that allow you to manage your content easily and flexibly.

  • WordPress, TYPO3, Drupal
  • Custom CMS Solutions
  • Headless CMS

E-Commerce Solutions

Professional online shops with all the features you need for successful e-commerce.

  • Shopware, WooCommerce, Magento
  • Custom Shop Systems
  • Payment Integration

Progressive Web Apps

Modern web applications with app-like functionality that work online and offline.

  • Offline Functionality
  • Push Notifications
  • App-like Experience

Web and Mobile Development: Cross-Platform Solutions for Every Screen

The line between web and mobile has blurred considerably, and modern users expect seamless experiences regardless of how they access your services. Our development approach embraces this reality by building applications that feel native on phones, tablets, and desktops alike. Using technologies like React, Next.js, Flutter, React Native, and .NET MAUI, we create unified experiences that share business logic while respecting the unique interaction patterns of each platform.

Progressive Web Apps represent a compelling middle ground for many business scenarios. They deliver app-like experiences through the browser, complete with offline functionality, push notifications, and home screen installation, without the friction of app store submissions or platform-specific codebases. We have built PWAs for field service teams who need reliable access in areas with spotty connectivity, and for customer-facing applications where reducing the barrier to first use directly impacts conversion rates.

Native mobile development remains the right choice when applications need deep integration with device hardware, maximum performance, or must adhere to strict platform design guidelines. Our iOS developers work with Swift and SwiftUI, while our Android team leverages Kotlin and Jetpack Compose. For projects where budget and timeline favor a shared codebase, we use Flutter or React Native to deliver polished cross-platform apps that genuinely look and feel native on both operating systems without compromise. Where your stack is already Microsoft- and C#-centric, .NET MAUI is a strong fit for cross-platform delivery across mobile and desktop.

Every web and mobile project we deliver includes responsive design as a non-negotiable foundation, not an afterthought. We follow mobile-first development principles, ensuring that interfaces work beautifully on small screens before progressively enhancing them for larger viewports. Accessibility testing follows WCAG 2.2 AA as the current standard (WCAG 2.1 is the predecessor). Whether BFSG, EAA or EN 301 549 applies is assessed for the specific digital service – not every corporate site is automatically in scope. Keyboard access, contrast and screen-reader checks sit in the pipeline, with manual spot tests before release.

From Concept to Pixel: The UX Design Process

A successful digital product doesn't start with code – it starts with a thoughtful UX design process. We begin with wireframes and mockups that make information architecture and user flows tangible before a single line of code is written. Building on that foundation, we develop a consistent design system with reusable components, color palettes, and typography rules. This system ensures visual consistency across all screens while significantly accelerating development. Through targeted A/B testing we validate design decisions with data: which button color converts better? Which layout drives more interactions? The result is interfaces that don't just look good but measurably perform.

Rendering Strategies for Performance and SEO

Choosing the right rendering strategy directly impacts load times, search engine visibility, and user experience. With Server-Side Rendering (SSR) and Static Site Generation (SSG), we deliver pages that are fully rendered on the first request – ideal for SEO and perceived speed. Combined with a Headless CMS, editors get a comfortable backend for content management while the frontend operates as a decoupled application offering maximum performance and flexibility. Next.js allows us to mix SSR, SSG, and client-side rendering on a per-route basis – giving every page exactly the rendering strategy that's optimal for its purpose.

Mobile Features That Make the Difference

Modern mobile apps thrive on features that go beyond simply displaying content. Push notifications keep users actively engaged and enable time-critical communication – from order status updates to personalized offers. For companies with an international focus, we implement comprehensive internationalization (i18n): multilingual interfaces, localized date and currency formats, and culturally adapted content. And with Progressive Web Apps, we bring app-like experiences directly to the browser – including offline capability, home screen installation, and fast load times, all without the hurdles of app store submissions.

Thorsten Frieling

How we get started together

Everything begins with an open conversation. You don't need finished plans—just tell us about your idea. We listen and find the right path together.

Thorsten Frieling – Project Management

Next step: web development with Groenewold IT Solutions

Strong web development does not end at launch—monitoring, performance, accessibility and iterative evolution define long-term value. We support you from scoping through operations.

Technical feasibility, clear documentation and pragmatic collaboration—Made in Germany (Leer, East Frisia).

FAQ

Frequently asked questions about web development

Platform decision: web or mobile

When should web and mobile be planned as one product?

Web and mobile belong in one product plan when both channels use the same accounts, data and business rules.

We define one backend as the source of truth while browser and app receive interfaces suited to their context. This prevents duplicated logic, diverging permissions and disconnected roadmaps.

A pilot may launch one channel first, but API contracts and the data model are prepared for the next client without creating a parallel architecture.

Which channel should launch first: web app, native app or cross-platform?

The first channel follows the usage context.

Browser access and SSO favour a web app; offline work, push or device features favour a store app. Flutter or React Native fit when iOS and Android share most features.

We assess reach, hardware access, distribution, operations and existing team skills, then cut a first release with measurable acceptance while preserving the shared backend and later channel.

How does a web development project run technically and organisationally?

Typical flow: discovery with user roles and integrations, UX/UI review, iterative delivery in sprints with demos, tests, go-live and optional maintenance.

Technically we use modern stacks (e.g. React/Next.js, Flutter/React Native) and documented APIs. Organisationally you get fixed contacts, milestone acceptance and clear ownership for operations.

Quick answers

App or mobile website?

It depends on the use case.

For reach, a website or PWA; for deep system integration and customer loyalty, often a native app.

Separate iOS and Android builds?

Usually not anymore.

With Flutter or React Native we build one codebase for both platforms, which significantly reduces cost.

How do we keep the app up to date?

We offer maintenance contracts so your app stays stable even when new operating system versions ship.

Do you build backends as well?

Yes—we deliver full stack.

The backend is often the more critical layer, because that’s where business logic and data live.

Technology & platforms

Native app or cross-platform – which is better for my project?

Native apps (Swift/Kotlin) offer maximum performance and full access to platform features.

Cross-platform development with Flutter, React Native or .NET MAUI delivers one codebase for iOS and Android with shorter timelines and lower cost when your requirements fit. We recommend based on use case, budget and release plan.

Which web frameworks do you use?

We primarily use React and Next.js—stable, performant and maintainable.

For complex enterprise applications we also use Angular; Vue.js where a lighter stack fits. Backends include Node.js, .NET and Python depending on integration and operations.

Development process

How does a typical project work?

Conception → UX/UI design → iterative development in sprints → testing → launch → support.

You receive regular demos and can steer priorities continuously.

Can we see progress during development?

Yes.

We work in sprints with access to a staging environment so you see increments early—no big-bang surprise at the end.

Costs & timelines

What does a website or app cost?

The app development cost calculator gives EUR 4,760 – 75,688 excl.

VAT as its non-binding overall range. Professional websites sit lower than web and mobile apps with backend and integrations. We provide a transparent quote after requirements analysis.

How long does development take?

Indicative ranges: website about 4–8 weeks; web app roughly 2–4 months; mobile app commonly 3–6 months (MVPs often 2–4 months; larger programmes 4–9 months).

Agile cadence means usable releases early so you can go live step by step.

Launch & operations

Do you also handle App Store publishing?

Yes—from screenshots and descriptions through technical submission to Apple App Store and Google Play, prepared to meet store guidelines.

What happens after go-live?

We offer maintenance with updates, fixes and further features.

Mobile apps need ongoing OS and policy alignment—we plan that into operations.

Can my app also work offline?

Yes.

We implement offline-capable apps that cache data locally and sync when online—important for field teams or unreliable connectivity.

Björn Groenewold – Managing Director Groenewold IT Solutions

ROI & cost clarity

When does a custom app pay off?

A tailored web or mobile app is an investment—it pays off when time savings, quality in core processes, and clean integration into your systems outweigh licensing costs or manual workarounds over the years. Leadership and IT need realistic ranges for budget and payback—not gut feelings—with the same rigour we apply to architecture and releases.

Use the ROI calculator for web and app development to relate investment, operating cost, and expected benefit—so you can have an honest conversation about fixed price, MVP scope, or long-term evolution from our team in East Frisia with clear milestones.

Björn GroenewoldManaging Director
Calculate ROI for web & app development →
Related topics for Web & Mobile Development

Everything you should know

Web and mobile often share APIs and authentication—yet release cadences and UX cycles differ. The articles below structure responsive web, PWAs and native apps for your audience.

All topics belong to Web & Mobile Development and cross-link where it makes sense.

Scope: Bridge page for web & mobile

This is a decision and bridge page—not the main page for web apps or native apps. Web app projects: web app development; store apps: app development.

Agency intent: app development agency; MVPs: MVP development.

Related paths and adjacent topics

Service overview: Software & platforms (overview)

More services in software & platforms

Adjacent service categories

Björn Groenewold

Up to 50% of your investment via BAFA/KfW

Use our funding calculator to see which government grants may apply to your project.

Björn Groenewold – Managing Director

Service cluster

Related services for Software & platforms: choose the right delivery route

Web and mobile are standard today—combined with custom software and CMS you build a strong digital presence.

Related topics

Complementary services from other areas

These services are frequently requested together with Web or Mobile Platform Decision or complement it thematically.

Integration & interfaces: find the right entry point

AI & machine learning: match the service to the need

IT consulting strategy: roadmaps & digitalisation