Get your app built
fast,
transparent,
handover-ready.
Flutter development for companies planning a new app or improving an existing one. From idea to the stores.
Every app starts with a clear specification.
Whether startup MVP, e-commerce app, or health platform — every project starts with a clear spec and ends with a maintainable codebase.
E-Commerce Apps
Shops, product catalogs, and checkout flows that convert — performant and identical on iOS and Android.
Health & Lifestyle
Sensitive data, clear workflows, and a UI that builds trust — from tracking to community.
MVP & Prototypes
Test an idea on the market fast — core features first, extensible instead of throwaway.
Step by step — no lock-in.
Each step has a clear deliverable. You decide after each step whether to continue — no commitment from start to finish.
Intro call
30 min · freeWe clarify your idea, the rough scope, and whether we're a fit. You get an initial assessment of feasibility and timeline.
You decide if step 2 makes sense.
Scope & specification
1–2 weeksThe idea becomes a clear, written specification: features, screens, data model, and a concrete offer with a fixed price or timeline.
You have a binding picture — and can still walk away.
Development
Weeks to monthsI build in short iterations — you see working builds regularly, give feedback, and always have visibility into progress.
Transparent status in every sprint, no black box.
Testing & launch
1–2 weeksTesting on real devices, store setup, screenshots, and submission. I support the release on Apple and Google until approval.
Your app is live — in both stores.
Handover & maintenance
optional · ongoingDocumented, maintainable code is handed over to you or your team. On request, I stay on as a mobile partner with fixed capacity for updates.
You stay independent — maintenance is an option, not an obligation.
How long does app development take?
Every project is different — but the timeline can be estimated early. You'll get a concrete cost estimate in the free intro call.
MVP / Prototype
Market test with core features
iOS + Android from one codebase
Full Product
Feature-rich app with integrations
iOS + Android from one codebase
Retainer
Long-term mobile partner
Fixed monthly capacity
Need a concrete cost estimate? Let's clarify in the intro call — free and no-obligation.
Free intro callWhy a freelancer?
Agencies have their strengths — but for focused app development, an experienced freelancer is often the better choice.
| Freelancer | Agency | |
|---|---|---|
| Point of contact | One person, directly | PM, developer, QA |
| Who builds? | Same developer from spec to launch | Rotating developers based on availability |
| Overhead | No middleman, no markup | PM, office, sales — all priced in |
| Speed | Short paths, fast decisions | Coordination across multiple levels |
| Handover | Documented & maintainable — no lock-in | Often designed for follow-up contracts |
What clients walk away with.
Wonderful, professional collaboration! K. laid the foundation for our entire mobile app development. Highly recommended!!
Andre Gröschel TrippleACode GmbHProfessional, results-oriented, always friendly collaboration. To be recommended without reservation. Thank you, K.!
Timo Mugele Framegrabber GmbHK. was a very valued colleague in my department. He was very reliable and always happy to support others in the team.
Andreas Partenhauser MediaMarktSaturn Technology GmbHWhat clients want to know upfront.
What does it cost to have an app built?
Do I get an app for iOS and Android?
Do I need technical knowledge?
What if I need changes after development?
How are you different from an agency?
Can you improve an existing app?
Ready to bring your app idea to life?
30-minute intro call — free and no-obligation. You'll know afterwards if it's a fit and what your project will cost.