Mobile App Development
iOS and Android apps that survive the first thousand real users.
Get in touch
About the service
We develop native and cross-platform mobile applications with React Native, Swift and Kotlin. Typical projects are customer portals, booking and loyalty apps, field service tools and marketplace products. We handle the full path from technical concept and architecture through store submission and the first post-launch iterations.
99.6%
crash-free session rate we target before release
12-20
weeks from concept to store submission for a first version
2
platforms served from one shared codebase
Challenges we solve
- #1
The budget only covers one platform but the customer base is split evenly.
We build with React Native so one team ships both stores, and drop to native modules only where the product truly needs it, such as background location or advanced camera work.
- #2
Apple rejects the submission repeatedly and the launch date slips.
We pre-check against the common rejection reasons: account deletion in-app, sign-in options, purchase rules, privacy labels and demo credentials. We also write the review notes and handle the appeal.
- #3
The app works in the office and fails on a construction site with poor reception.
We design offline-first with local storage, a sync queue and conflict resolution, so field staff keep working and data reconciles automatically when the connection returns.
- #4
Push notifications annoy users and uninstall rates rise.
We implement a notification centre with granular opt-ins, frequency caps and event-based triggers instead of broadcasts, and measure the retention effect of every campaign type.
Mobile applications
The expensive part of an app is not version one, it is everything after: releases, store reviews, operating system updates, crash triage and analytics. We build with that in mind, using a modular architecture, over-the-air updates for the JavaScript layer and crash reporting from day one. You receive the repositories, the signing keys, the release pipeline and documentation that lets another team continue the work.
Recommended services
- 01 - 5Website developmentFast, secure websites your team can update without a developer.
- 02 - 5Testing of sites and applicationsFind the bugs before your customers and your reviews do.
- 03 - 5CRM systemsOne system where every deal, call and invoice actually lives.
- 04 - 5Telegram bots and parsersAutomate ordering, support and data collection inside a chat.
- 05 - 5Software developmentCustom systems for processes no standard product covers.
Frequently asked questions
A focused first version with authentication, a few core screens and a backend connection starts at 18,000 EUR. Marketplace or fintech products with payments and complex roles typically run from 45,000 EUR.
Cross-platform for roughly eighty percent of business apps, because it halves cost and keeps feature parity. Native when performance, hardware access or platform-specific interaction is the product itself.
The app must be published under your own developer accounts so you own the listing, ratings and revenue. We set the accounts up with you and handle the submission process itself.
Plan fifteen to twenty percent of the build cost annually. That covers operating system updates, library security patches, store policy changes and small improvements from user feedback.
Data minimisation by design, EU hosting for the backend, an in-app consent dialogue before tracking, plus account and data deletion inside the app as both stores now require.
ourclients
- Markus LehmannReview from Google2 months ago
websitebestellen exceeded our expectations! The new website is modern, fast and precisely tailored to our target group. Working together was straightforward and highly professional. A clear recommendation!
- Sabrina HoffmannReview from Google2 months ago
Great experience from start to finish! The team at websitebestellen advised us excellently, implemented our wishes and created a wonderful website. Absolutely recommendable!
- Lea SchneiderReview from Google2 months ago
websitebestellen took our online presence to a new level! The site not only looks great, it also brings us noticeably more enquiries and customers. Thank you for the excellent work!
Related reading
- Mobile app or PWA? A decision guideWhat a progressive web app can do in 2026, where a native app is still unavoidable, and how the costs compare over three years.
- Improving Core Web Vitals: the measures that actually workLCP, INP and CLS explained without jargon, with the fixes that move field data rather than lab scores.
- Next.js or WordPress for a company website?A practical comparison for German SMBs: editorial comfort, running costs, security and the point at which a rebuild is worth it.
Your contact person
Miriam Kraus
I read every request personally and get back to you within one business day.