Mobile App Development Agency
Two native codebases cost you double. For the same app.
Cross-platform development with React Native and Flutter cuts build time by 40% and halves what you spend maintaining it. We're the app development agency that ships iOS and Android from one codebase that doesn't feel like a shortcut. Berlin-based, fixed price after scoping.
Book a free mobile strategy callWhy most mobile projects stall
You've got a clear use case: a customer-facing app, a tool for field crews, an internal ops dashboard that has to work on a phone. But native development means two teams, two timelines, and two bugs for every feature. Cross-platform frameworks changed that math. We build with React Native and Flutter to ship both platforms from a single codebase, with up to 90% code reuse and one team you can actually talk to.
- Cross-platform with React Native or Flutter: one codebase, two stores, 30-50% lower cost
- Native iOS or Android when deep OS integration actually demands it
- Offline-first data sync for warehouses, job sites, and rural service areas
- Analytics and push strategies that turn installs into daily active users
What you get
UX built for thumbs
Navigation tested on real devices, not just Figma. Tap targets, gesture flows, and screen transitions that feel native on both platforms instead of a website squeezed into a phone.
Offline-first sync engine
Your field team works in basements, elevators, and dead zones. We build the queue-and-sync layer on SQLite or WatermelonDB so the app keeps working offline and reconciles when signal returns. No lost data. No duplicate entries.
Push that people don't mute
Targeted notifications wired through Firebase Cloud Messaging or OneSignal, triggered by behavior, not broadcast spam. We've seen clients hit 3x re-engagement by sending fewer, smarter pushes.
Usage analytics from day one
Screen flows, drop-off points, feature adoption, piped into PostHog or Firebase. You'll know which screens matter and which ones nobody opens. Decisions backed by data, not a roadmap meeting.
Both stores done for you
Screenshots, metadata, privacy declarations, review responses, for App Store and Play Store. Apple rejects roughly 40% of first submissions on technicalities. We've shipped dozens. Yours clears review.
Auth that works everywhere
Biometric login, SSO, OAuth, session management, and token refresh. Secure without making people type a 16-character password on a phone keyboard. GDPR-compliant handling baked in.
How we build it
1
Strategy
Platform choice, feature priorities, user personas. We'll tell you if you need an app at all or if a progressive web app saves you six figures.
2
Design and prototype
Interactive prototypes on your actual phone. Test flows with real users before we write production code. A wireframe is cheaper to fix than a release.
3
Build and test
Two-week sprints. Every sprint ships a testable build to your device. Automated testing across screen sizes. You click through real software, not slide decks.
4
Launch and measure
Store submission, soft launch, analytics review. We watch the first 30 days of real usage and fix what the numbers tell us to fix.
What to expect
Typical timeline
8-14 weeks to first store release
Investment
Starting from EUR 40,000
Your involvement
Weekly demos, design feedback, and access to test devices. About 3-5 hours per week.
Technology
One codebase. Two stores.
Cross-platform frameworks that ship iOS and Android from the same code. Native modules when you truly need them. You own the source and the pipelines from day one.
React Native
Flutter
TypeScript
Swift
Kotlin
Firebase
Common questions
React Native, Flutter, or native?
For most business apps, cross-platform wins. You get up to 90% code reuse across iOS and Android, 30-50% lower cost, and one team on one codebase. We go native only when you need heavy 3D rendering, deep hardware pipelines, or performance that's measurably impossible otherwise. That's rare. We broke down the full decision here: native vs. cross-platform 2026
What does a mobile app cost to build?
A cross-platform app starts around EUR 40,000 and ships in 8 to 14 weeks. Price scales with screens, integrations, and whether you need offline sync, payments, or real-time features. Building native iOS plus Android separately runs 30-50% more, because it's two codebases and two teams. We scope a fixed price after a short discovery call, so the number doesn't move mid-build.
How fast can you get our app into the stores?
First store release in 8 to 14 weeks for most apps. You get a testable build on your own device every two weeks, so you're never waiting months to see progress. Apple and Google review adds a few days. We prep submissions to clear it on the first try, not the third.
Do you handle App Store and Play Store submission?
Completely. Build prep, metadata, screenshots, privacy declarations, and review responses for both stores. Apple rejects roughly 40% of first-time submissions on technicalities. We know the review guidelines well enough to avoid that.
What about ongoing maintenance?
Mobile apps break if you ignore them. OS updates, API changes, security patches. We offer maintenance contracts or hand everything over with full documentation, CI/CD pipelines, and recorded walkthroughs. Your choice, no lock-in either way.
How are you different from the agencies on Clutch?
Those listings rank by review volume, not engineering quality. We're a small senior team in Berlin, not an offshore body shop with a sales layer on top. You get the engineers who write your code on every call, EU data handling by default, and the full source plus CI/CD at handoff. No account manager relaying messages to a team you never meet.
What mobile frameworks do you use?
React Native or Flutter for cross-platform. TypeScript keeps the codebase sane. Swift and Kotlin for native modules when deep OS integration demands it: camera pipelines, Bluetooth, AR. Firebase for push and analytics. We recommend cross-platform for 90% of business apps. You get both stores from one team.
Got an app idea collecting dust?
Send us the use case. We'll reply in 48 hours with a platform recommendation, rough timeline, and the three risks you haven't thought of yet.