Cross-Platform Mobile App Development – Faster Launch, Lower Costs

Stop Slow Apps and Delayed Market Launches

Your business needs a mobile app that launches quickly, runs smoothly, and scales with your growth. Many companies lose months and thousands of euros because they have to develop two separate apps – one for iPhone, one for Android.

The Solution: We develop cross-platform apps that run simultaneously on iOS and Android. This means for your business:

• 40% faster launch: Your app is weeks earlier on the market
• Up to 60% cost savings: One development instead of two separate projects
• Easier maintenance: Updates are developed once, deployed everywhere
• No compromises on performance: Your app runs as fast as native apps
• Direct customer contact: Push notifications reach your users instantly
• Offline functionality: Your app works even without internet connection

Proven by global companies: Alibaba, BMW and eBay use the same technology for their apps.

How We Accelerate Your App Development

Cross-Platform: One Codebase for All Platforms – Without Compromises

We rely on Flutter, an open-source framework by Google that serves iOS, Android and Web from a single codebase.

Supabase & Firebase: Fast Start Without Enterprise Costs

For backend functions we use Supabase (Open Source) or Firebase (Google) to launch your app faster:

• Real-time database: Changes are synchronized immediately on all devices – without your own server infrastructure
• User authentication: Login with email, Google, Apple built-in – saves weeks of development time
• Cloud storage: Store images and files securely without managing your own servers
• Cost efficiency: Pay-per-use instead of expensive server infrastructure from day 1

For complex business logic we also develop custom backends — depending on your requirements. Read our guide: Firebase vs. Supabase vs. Custom Backend for scalable apps.

Strategic Technology Selection: Native vs. Cross-Platform

Not every project needs the same tool.

For 80% of business apps, Flutter is the optimal choice:

• 60% faster to market
• 40-60% cost savings
• Native performance without compromises

For specialized use cases (AR/VR, real-time graphics, extremely low latency) we build native apps in Swift (iOS) or Kotlin (Android).

We analyze your requirements and recommend the most cost-efficient approach.

Our Development Process

From the first idea to successful launch, we guide you through all phases:

1. Conception & Design

We start with a free consultation and develop together:

• Clear requirements and prioritized features
• Professional app design focused on best user experience
• Interactive prototypes for testing before development
• Transparent timeline and fixed-price quote

2. Development & Testing

During development you receive regular updates and can test the app live:

• All agreed features and functions
• Backend integration or development (see Backend Services)
• Secure authentication and user management
• Push notifications and analytics
• Payment integration if needed
• Comprehensive testing on all target devices

3. Launch & Support

We handle the complete App Store launch and stay by your side long-term:

• Release to Apple App Store and Google Play Store
• GDPR-compliant privacy policy
• Monitoring and performance tracking
• Ongoing Maintenance & Support as needed

What Does a Mobile App Cost?

The cost of mobile app development depends on scope, complexity and chosen technology. As a rough guide:

Cost Savings Through Cross-Platform: With Flutter you save 40-60% compared to two separate native apps, as you only develop and maintain one codebase.

Our Technology Strategy: Modern, Proven, Scalable

For technical decision-makers: We don't follow hypes, but rely on an "Opinionated Stack". This means: We have a standardized, perfectly coordinated architecture with which we implement 80% of all projects faster and more stable.

Do you have specific legacy requirements or existing infrastructure? No problem. We adapt our stack flexibly to your needs.

Core Mobile Architecture

10 proven factors for lightning-fast mobile apps: Performance optimization that delights your users.

Backend & Data

Quality Assurance & DevOps

Why This Stack?

Flutter instead of React Native: Own rendering engine (no JavaScript Bridge) = 40% better performance. Compiles to native code. Used by Fortune 500 companies.

Clean Architecture: Enables easy migration (e.g. from BaaS to Custom Backend) without rewriting the app. Long-term maintainability = lower Total Cost of Ownership.

Security & Privacy

Security and privacy belong in every layer of the architecture — not in a marketing paragraph. Concretely that means:

• Privacy by Design (Art. 25 GDPR) anchored in the data model and API layer — not as a cross-cutting layer placed on top of the app
• TLS 1.3 in transit, AES-256 at rest, OAuth 2.0 / OIDC for auth, OWASP ASVS Level 2 as baseline for sensitive data
• Architecture geared to the GDPR: data-processing agreement (Art. 28 GDPR) available as standard, documented technical-and-organisational measures per Art. 32, EU hosting by default
• Hosting in Germany: optionally available — when supervisory requirements (KRITIS, BaFin) demand it (see Cloud Services)
• Security audits as needed: pen test before go-live for sensitive apps, dependency scanning in CI, annual architecture review

Complete guide: GDPR, European Accessibility Act and DACH compliance for mobile apps.

Why IntegrIT Solutions?

• 10 years of experience: Since 2015 we have been developing successful web and mobile apps for startups and established companies
• Modern technology expertise: We choose the best technology for your project – no compromises
• Full-stack competence: We develop not only the app, but also your Backend and Cloud infrastructure
• Direct contact: You speak directly with the senior developer – no communication chains
• Transparent pricing: Fixed-price offers without hidden costs
• Regional presence: Personal meetings in Baden-Württemberg and Switzerland possible

References: Mobile Apps from Our Agency

We have developed mobile apps for various industries:

• Buenro: Flutter booking platform for accommodations with Firebase backend
• Medione: Medical patient platform for nephrology (GDPR-compliant, highly sensitive data)
• Liteblox: IoT app for battery management with Bluetooth integration and real-time telemetry
• Permaplay: Sustainability app for permaculture community

Selected projects can be found on our References Page.

Start Your Mobile App Project

Ready to implement your app idea? Book a free 30-minute consultation. We analyze your requirements and show you concrete implementation options – non-binding and without obligation.