App development that drives your business forward
You don't need an in-house dev team. We handle your entire app project — from the first idea to a successful launch on the App Stores. For iOS, Android, and cross-platform.
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App development — from idea to store
No prototypes that end up in a drawer. We build apps that measurably support your business goals — whether it's revenue growth, process optimization, or customer retention.
iOS App Development
Native iPhone and iPad apps that delight users. From concept and design to publication on the App Store.
- Native Swift or cross-platform
- Apple Human Interface Guidelines
- App Store Optimization included
- Apple Watch & iPad support
Android App Development
High-performance Android apps for smartphones and tablets. Optimized for the diversity of the Android device landscape.
- Native Kotlin or cross-platform
- Material Design 3 guidelines
- Google Play Store publication
- Tablet and foldable optimization
Cross-Platform Apps
One codebase, all platforms. Save 30-40% on development costs with the same user experience on iOS and Android.
- Unity 3D, Flutter, or React Native
- Native look & feel per platform
- Shared business logic
- Faster time-to-market
Enterprise Apps
Custom enterprise solutions that seamlessly integrate into your existing IT infrastructure. Secure, scalable, maintainable.
- ERP, CRM, and API integrations
- Single Sign-On & permissions
- Offline capability & sync
- GDPR and compliance ready
App Modernization
Outdated app? Performance issues? We analyze, optimize, or rebuild — whichever is the most cost-effective solution.
- Technology migration
- Performance optimization
- UX/UI redesign
- Legacy code replacement
Maintenance & Support
The work doesn't stop after launch. Regular updates, monitoring, and further development keep your app successful.
- Regular OS compatibility updates
- Performance monitoring & analytics
- Feature extensions
- 24/7 incident response optional
Apps with measurable results
What matters isn't the technology, but what it does for your business. Anonymized for confidentiality.
Fleet Management App for Logistics Corporation
Cross-platform app for real-time tracking of 800+ vehicles. GPS integration, automated route planning, offline synchronization, and driver communication. Connected to existing ERP system.
Patient App for Hospital Group
iOS and Android app for appointment booking, digital report delivery, and doctor-patient communication. GDPR-compliant with end-to-end encryption. Integrated with existing hospital information system.
Marketplace App for B2B Trading Platform
Native shopping app with real-time inventory sync, personalized recommendations, and integrated payment system. Push-based promotional communication. 45,000+ active users.
IoT Control App for Machine Manufacturer
Tablet app for controlling and monitoring industrial machines via Bluetooth and MQTT. Real-time dashboards, alarm system, and maintenance alerts. Unity 3D for 3D machine visualization.
Advisor App for Insurance Group
Enterprise app for 1,200 field representatives. Offline-capable client advisory with digital quote calculator, electronic signature, and CRM synchronization.
Property Management App for Housing Association
Cross-platform app for tenants and property managers. Damage reporting with photos, document management, utility billing, and push notifications. 12,000 managed units.
Smart Home App for Energy Provider
Customer app for controlling smart home devices and real-time consumption analysis. Gamification elements for energy-saving challenges. Integration with EV charger and solar panels.
Employee App for Corporation with 6,000 Staff
Internal company app for shift scheduling, digital payroll, leave requests, and company news. Single Sign-On and Active Directory integration.
What our clients say
"The app completely transformed our internal processes. Our field staff now work twice as fast — and the error rate has dropped to nearly zero. The investment paid for itself in under a year."
"Finally a developer who isn't just technically excellent but also understands our business requirements. The clinic app was enthusiastically received by patients and staff alike."
"We had two failed app projects behind us before we found app-developer. This time everything worked — on budget, on schedule, and the app performs brilliantly. It was the transparent communication that made the difference."
"The cross-platform solution saved us an enormous amount of money. One codebase for iOS and Android — and yet the app feels native on both platforms. Mr. Schnepf far exceeded our expectations."
"The IoT app for our machine control has become a real competitive advantage. Our customers are thrilled with the 3D visualization and the intuitive interface. The Unity expertise was the key differentiator."
Why work with us?
You work directly with the developer who builds your app. No account manager standing between you and the implementation.
12+ Years of App Expertise
Not a generalist who "also does apps." App development is all we've done for over a decade. That means: less risk, better UX design, faster results.
From Idea to App Store
Concept, UX design, development, testing, launch — all from a single source. You don't get a half-finished project, but a published, working app.
Transparent Costs, No Overhead
No agency overhead, no hidden fees. Transparently billed — hourly or fixed price. You pay for development, not administration.
Apps for every industry
Every industry has its own requirements. We know the differences and build apps that fit your exact business processes.
Logistics & Transport
Fleet management, route planning, real-time tracking, digital delivery notes. Mobile solutions that work reliably even offline.
Healthcare
Patient apps, telemedicine, digital report delivery, clinic communication. GDPR-compliant and integrated with hospital systems.
Finance & Insurance
Advisor apps, customer portals, digital quote calculators. Highest security standards and compliance conformity.
E-Commerce & Retail
Shopping apps, marketplace platforms, loyalty programs. Seamless integration with existing shop systems.
Industrial & Manufacturing
IoT control, machine monitoring, predictive maintenance, digital maintenance logs. Unity 3D for 3D visualizations.
Energy & Real Estate
Smart home control, consumption analysis, property management, tenant communication. IoT integration and real-time data.
Proven Technologies
From briefing to finished app
You always know where we stand, what's coming next, and what it costs. No surprises.
Discovery Call
Free 30-minute call. App idea, target audience, platform, budget. Honest advice, no sales pitch. If it's not a fit, we'll tell you.
Concept & Prototype
Functional specification, UX wireframes, and optional clickable prototype. You experience the app before committing to full production.
Agile Development
Production in 2-week sprints with testable builds. You test, provide feedback, and can adjust priorities. Every 14 days.
Launch & Support
QA, store submission, launch support. Optional: maintenance contract, performance monitoring, feature updates, and continued development.
Initial consultation is free. Then you decide. Optional: clickable prototype in 4-6 weeks. You experience the app before committing to full production.
Request a Free Quote →How much does your app cost?
Get an initial budget and timeline estimate in 30 seconds. Ideal for your internal planning and decision-making.
Frequently Asked Questions
An MVP or prototype starts at 15,000 EUR. A full-featured business app typically ranges from 30,000 to 100,000 EUR. Enterprise solutions with system integration start at 60,000 EUR and up. In a free initial consultation, we'll give you a realistic figure — transparent and reliable.
You'll have a functional prototype in 4 to 6 weeks. A complete business app takes 3 to 6 months. Every 14 days you receive a testable build — so you can see progress and adjust direction at any time.
Not at all. Most of our clients are CEOs, IT directors, or project managers — not programmers. We translate your business requirements into technical solutions and explain everything in plain language.
That depends on your target audience. We often recommend cross-platform development — one codebase for both platforms. This saves 30-40% of costs with the same result. In the initial consultation, we'll analyze what makes the most sense for your project.
Yes, that's one of our most common projects. Whether it's outdated technology, performance issues, or new features — we analyze the current state and recommend the most cost-effective solution: modernization or rebuilding from scratch.
Step 1: Free 30-minute consultation. Step 2: We create a proposal with a clear price and timeline. Step 3: Every 2 weeks you receive a testable app build and provide feedback. You have full control at all times.
You do. We transfer all rights, the complete source code, and documentation. German contract, NDA standard. You can have the app developed further by another developer at any time.
We offer optional maintenance contracts for regular updates, new features, performance monitoring, and store management. But you're not locked in — we also hand over the project completely with full documentation if needed.
Data protection and IT security are integral to every project. GDPR compliance, encrypted data transfer, secure authentication, and regular security audits are standard. ISO 27001-compliant processes available upon request.
Absolutely — we actually recommend it. Start with an MVP or prototype. Test the response from your users. If it works, we scale together. No risk, no all-or-nothing.
Let's discuss your app project
Free 30-minute consultation. Feasibility, platform recommendation, budget estimate. Within 24 hours.
Briefly describe your app idea or project. We'll get back to you within 24 hours with an initial assessment and suggested meeting times.
What happens in the initial call: We clarify feasibility, the right platform, and you get an honest budget estimate. No pitch, no pressure.