iOS · Android · Cross-Platform

An app that survives the store.
Not just one that runs on your machine.

Most apps never even make it reliably through the review process, or fall over at the first hundred users. We build mobile applications designed from day one for stability, store readiness, and long-term maintainability, with Flutter for cross-platform projects or native development when that's the better fit.

Discuss your app All services

Why Zeitcode for mobile apps

Eight-plus years of Flutter practice, paired with a clear sense of when native development is actually the better answer.

Technology choice

Cross-platform or native, based on need

Flutter for one team, one codebase, and fast iteration on iOS and Android. Native development when deep platform integration or maximum performance matters most.

Store-ready

No stress at App Store review time

Signing, provisioning, store listings, and review cycles for iOS and Android are part of our routine, not a surprise right before launch.

Observability

You know how your app is actually used

Crash reporting, analytics, and feedback loops from day one, so decisions rest on real data instead of guesses.

Experience

From greenfield builds to taking over someone else's code

New apps built from scratch, or taking over and stabilizing an existing app of uncertain code quality. Both are part of our everyday work.

Book intro call See Flutter details

Production-ready

What makes an app production-ready

It's not the first prototype that matters — it's what still runs stably after the hundredth update.

Architecture

Scalable for growing feature teams

Clear architecture and module structure from the start, so new features don't turn into an unmanageable pile of special cases.

Offline & sync

Works even on a bad connection

Offline-first approaches and thoughtful synchronization, so the app stays reliable on the subway or on a job site.

Feature flags

Controlled rollouts instead of all-or-nothing

Roll out new functionality to user segments gradually, test it, and turn it back off if needed without a new store release.

Quality

Automated tests instead of manual clicking

Unit, widget, and integration tests, so a new feature doesn't quietly break an old one before anyone notices.

Process

How your app project runs

Four phases, from concept to store release.

Phase 1
Concept
Audience, platforms, technology
- ✓Clarify core features and target audience
- ✓Decide cross-platform or native
Phase 2
UI/UX
Design system & navigation
- ✓Reusable components instead of one-off screens
- ✓Navigation and state structure clean from the start
Phase 3
Build
Development, tests, backend integration
- ✓Implementation backed by automated tests
- ✓Integration with backend, push, and analytics
Phase 4
Release
Store approval & rollout
- ✓Signing, store listings, review support
- ✓Staged rollout with monitoring

Phase 1
Concept
Audience, platforms, technology
- ✓Clarify core features and target audience
- ✓Decide cross-platform or native
Phase 2
UI/UX
Design system & navigation
- ✓Reusable components instead of one-off screens
- ✓Navigation and state structure clean from the start
Phase 3
Build
Development, tests, backend integration
- ✓Implementation backed by automated tests
- ✓Integration with backend, push, and analytics
Phase 4
Release
Store approval & rollout
- ✓Signing, store listings, review support
- ✓Staged rollout with monitoring

Step by step, with clear outcomes per phase.

Testimonials

Voices from app projects

Short excerpts from projects we've supported from first release through stable ongoing operation.

Scalability

Cost

Fast & SEO-optimizedSEO-optimizedScalable & customizableCustomizablePrototype / risk zonePrototypeCross-platformSEO support

From a chaotic codebase to stable releases

“We inherited an existing app with a lot of legacy baggage. After stabilizing it and introducing clean CI/CD processes, every release now ships without ugly surprises in the store.”

A. S.

Product Owner

Clear decisions backed by real data

“Before, we guessed a lot on feature decisions. With clean analytics tracking we now see in black and white what users actually do, and prioritize accordingly.”

F. O.

Head of Product

What we often hear

✓Store releases ship without ugly surprises
✓One codebase for iOS and Android saves noticeable time
✓Clear data instead of gut feeling on product decisions

Intro call Services

Beyond that

Services in detail

From a brand-new app to taking over and stabilizing an existing project.

Cross-platform

Flutter app for iOS, Android & web

One codebase for multiple platforms — the right fit for most projects, from MVP to a fully grown app.

✓One team, one codebase, multiple platforms
✓Faster iteration than separate native teams
✓Eight-plus years of hands-on Flutter experience

Request a Flutter app See Flutter details

Native

Native app development

When maximum performance or deep platform integration matters most, we build natively for iOS or Android.

✓Full control over platform-specific capabilities
✓Ideal for compute-heavy or hardware-close use cases
✓Can complement an existing cross-platform app

Get in touch See backend & APIs

Takeover

Take over & stabilize an existing app

Audit an unfamiliar codebase, fix bugs, and introduce CI/CD and quality gates before new features get layered on top.

✓Honest code audit before the project starts
✓Stabilization before new features
✓CI/CD and a test foundation retrofitted

Request an audit See AI Vibe-Code Rescue

FAQ

Questions about mobile app development

Answers on Flutter, native development, and the typical project flow.

Still have a question?

Flutter or native — which is better for us?

For most projects, Flutter is the more efficient choice: one codebase, faster iteration, consistent look-and-feel across both platforms. For very hardware-close needs or extreme performance requirements, native development can make more sense. We'll give you an honest read on this in the intro call.

Book a call Contact

Can you take over an existing app another team built?

Yes. We start with an honest audit of the existing codebase, surface the biggest risks, and stabilize before layering on new features.

Book a call Contact

How long until the first store release?

Heavily dependent on scope. A focused MVP can be store-ready within a few weeks; a more complex product takes correspondingly longer. We clarify concrete timelines in the intro call based on your scope.

Book a call Contact

Next step

App project with a clear goal?

In the intro call we clarify your audience, the right technology, and a realistic timeline to store release.

Free & no obligation·No sales pitch·20 to 30 minutes

Book
intro call

Free & no obligation·No sales pitch·20 to 30 minutes

An app that survives the store.
Not just one that runs on your machine.

An app that survives the store.Not just one that runs on your machine.

Cross-platform or native, based on need

No stress at App Store review time

You know how your app is actually used

From greenfield builds to taking over someone else's code

Scalable for growing feature teams

Works even on a bad connection

Controlled rollouts instead of all-or-nothing

Automated tests instead of manual clicking

Audience, platforms, technology

Design system & navigation

Development, tests, backend integration

Store approval & rollout

Audience, platforms, technology

Design system & navigation

Development, tests, backend integration

Store approval & rollout

Voices from app projects

Flutter app for iOS, Android & web

Native app development

Take over & stabilize an existing app

Flutter or native — which is better for us?

Can you take over an existing app another team built?

How long until the first store release?

App project with a clear goal?

An app that survives the store.Not just one that runs on your machine.

Cross-platform or native, based on need

No stress at App Store review time

You know how your app is actually used

From greenfield builds to taking over someone else's code

Scalable for growing feature teams

Works even on a bad connection

Controlled rollouts instead of all-or-nothing

Automated tests instead of manual clicking

Audience, platforms, technology

Design system & navigation

Development, tests, backend integration

Store approval & rollout

Audience, platforms, technology

Design system & navigation

Development, tests, backend integration

Store approval & rollout

Voices from app projects

Flutter app for iOS, Android & web

Native app development

Take over & stabilize an existing app

Flutter or native — which is better for us?

Can you take over an existing app another team built?

How long until the first store release?

App project with a clear goal?

An app that survives the store.
Not just one that runs on your machine.

An app that survives the store.
Not just one that runs on your machine.