Mobile development
App development for iOS & Android
One codebase, both platforms — from the first idea to the store launch. Built in Frankfurt, by a team with its own apps in the stores.
We ship our own apps
Two apps of our own in the stores — the same decisions, the same review processes, the same responsibility after launch.
TankKosten · FuelFile
Scan fuel receipts via OCR, review costs and export ready for DATEV.
Availability
Live on Google Play · iOS coming soon
View the app
LadeKosten · ChargeDoc
Track EV charging costs and document them properly for tax purposes — including DATEV export.
Availability
App Store · Google Play
View the appStack & principles
The technology follows the project — not the other way round. What we use, and what we build by.
React Native
iOS and Android from one shared codebase — one team, one release cycle, consistent behaviour on both platforms.
Flutter / Dart
The alternative cross-platform base when a highly distinctive UI and fluid animation lead the requirements.
Swift (native iOS)
Native for iOS when deep platform integration or maximum performance is the deciding factor.
Backend integration
APIs and services in Node.js, Java or Python — the app gets the backend it actually needs.
QA & test automation
Mobile E2E tests with Maestro — the same test flows we run against our own apps — plus Jest for the logic. Every release verified reproducibly instead of just clicked through.
More about mobile E2E testingOffline-first & privacy by default
The design principle behind our own apps: works without a connection, no tracking, data stays with the user.
How a project runs
Four phases, clear handovers — you know at every point what comes next.
- Step 1
Consulting & analysis
1–2 weeksWe clarify audience, scope and platforms — and which parts of it belong in a first version.
- Step 2
Concept & planning
2–4 weeksScreens, data model, architecture and backend interfaces are settled before the first line of production code exists.
- Step 3
Development & testing
4–12 weeksImplementation in two-week sprints with a runnable build at the end of each — automated tests included.
- Step 4
Go-live & support
ongoingStore submission for the App Store and Google Play, guidance through review, and operation after launch.
An MVP is typically in the store within 8–12 weeks.
What we commit to
- Reply within 24 hours
- Concrete quote within 48 hours
- 3 months of free support after go-live
- 12 months of warranty
- 100% GDPR-compliant
- Hosting in Germany
Let’s talk about your app
Tell us about your project — we’ll tell you how to cut a first version out of it.
30 minutes, no strings attached. Reply within 24 hours, quote within 48 hours.