210,000+ users in our appsBuilding since 2018 · Frechen, GermanyCurrently: 2 slots open for Q3 2026info@thecodecave.de+49 152 04943138Frechen · NRW · DE210,000+ users in our appsBuilding since 2018 · Frechen, GermanyCurrently: 2 slots open for Q3 2026info@thecodecave.de+49 152 04943138Frechen · NRW · DE
// App development

Have your app built — by a studio that runs apps of its own.

From idea to app store: we build your iOS and Android app with Flutter from one codebase — a fixed price instead of hourly rates, store release and operation included. Since 2018, over 210,000 users across our apps.

  • iOS + Android — one codebase
  • Fixed price, not hourly
  • App store release included
// The problem

Most app projects don’t fail because of the idea.

They fail because of open-ended hourly budgets, building twice for iOS and Android and vendors who vanish after handover. The result: more expensive than planned, later than planned — or never in the store.

No end in sight

Hourly-rate projects grow until the budget is gone. What was “roughly” at the start costs double in the end.

Built twice

Two native apps mean two codebases, two teams, double the cost — again with every single update.

Alone after launch

Store reviews, new iOS and Android versions, security updates: without ongoing care an app is outdated within a year.

// How it works

Four steps from idea to the stores.

No months-long concept paper. We think in MVPs: the core feature first, into real hands fast — then expand deliberately.

  1. Intro call & MVP scoping

    You tell us what the app should do. Together we scope the MVP — what must go in, what can wait — and name a fixed price.

  2. Design & development

    We build iOS and Android from one Flutter codebase. You see regular interim builds on your own phone — no flying blind.

  3. App store release

    Store listing, screenshots, the review process at Apple and Google — we handle the entire release until the app is live.

  4. Operation & growth

    After launch we stay on it: updates, monitoring, new features. And the code belongs to you at all times.

// Done-for-you

You bring the idea — we deliver the rest.

No project for you to manage, no dev team for you to hire. You bring your idea and your domain knowledge — we deliver the finished app in both stores.

You provide

  • Your idea and the problem the app solves for users
  • Domain knowledge from your business — we ask the right questions

We deliver

  • Concept & MVP scoping with a clear fixed price
  • Design and development for iOS + Android — one Flutter codebase
  • App store release: listing, screenshots, review process
  • Operation, maintenance & further development after launch
// References

Apps we built — and run ourselves.

No anonymous logos: these apps are live in the stores — several of them our own products.

RoadReview

Our own app for driving schools: documents lessons with GPS and voice notes. iOS + Android, one Flutter codebase.

MyMonty

Training app for water-damage restoration: how-to videos and missions for the team — right on the technicians’ phones.

TaxCastle

Photograph receipts instead of retyping them: reads receipts in seconds and books them into DATEV — in use at tax firms.

LS-Athletics

Training app with exercise plans and progress tracking — built with Flutter, HealthKit integration included.

// Why us

We build our own apps. That changes everything.

Most agencies only build for clients. We run our own apps with over 210,000 users — so we know what really counts after launch: stability, store reviews, updates, support.

2018
in business since
20+
apps live in the stores
210,000+
users across our apps

Own products in daily operation

RoadReview, TaxCastle, MyMonty — we carry the responsibility for apps that have to run every day. That experience flows into your project.

Flutter agency: one code, both stores

We build iOS and Android from one codebase — faster, cheaper and more consistent than two native apps, with every update.

App development from Frechen near Cologne

No anonymous offshore team: development in Germany, short paths, German contracts — and one contact who knows your project.

// Quality & ownership

Live in the store is just the beginning.

An app isn’t a project with an end date — it’s a product. That’s why our work doesn’t stop at handover — and the code belongs to you from day one.

App store release included

Apple review, Google approval, store listing with copy and screenshots — we know the process from 20+ releases and handle it completely.

Maintenance & updates

New iOS and Android versions, security updates, monitoring: we keep your app running — predictably, for a monthly fee.

The code is yours

Full ownership of the source code, cleanly documented and handed over. You can switch any time — no lock-in.

// Investment

One fixed price. No hourly rate.

MVP thinking instead of a wish list: together we scope the version that proves your idea — and quote it fixed. We name the price after the free intro call — tailored to feature scope and integrations.

MVP fixed price

The core feature first, costed fixed — no open-ended hourly budget, no wish-list trap.

Deposit on order

A fair share at the start, the rest on release in the stores.

Monthly fee

A predictable amount for operation, maintenance and updates — so your app still runs tomorrow.

Fixed price after a free intro call — no hourly rate, no surprises.

Free intro call
// Guarantee

In the store — or deposit back.

We carry the risk, not you.

Release guarantee

If your app doesn’t reach the stores within the agreed timeframe, you get the deposit back. We commit to the concrete timeframe in the quote.

MVP first, trust second

We deliberately start small: the MVP proves your idea with real users before you invest big. Scaling up is always possible — scaling back never is.

// FAQ

Frequently asked questions

What businesses ask most before getting started — answered briefly and honestly.

  • What does an app cost?
    Honestly: it depends on the feature scope — a lean MVP costs a fraction of an app with a wish list. That’s why we work with MVP thinking and a fixed price: in the free intro call we scope the build and name a fixed price — no open-ended hourly budget, no surprises.
  • How long does development take?
    It depends on the scope: a focused MVP reaches the stores much faster than an app with every extra. We commit to the concrete timeframe until the store release in the quote — including our release guarantee.
  • iOS and Android — do I have to pay for two apps?
    No. We develop with Flutter: one codebase that produces both apps. iOS and Android look the same, behave the same and get updates at the same time. Our own apps like RoadReview run exactly this way — for years.
  • Who owns the code?
    You do. You receive full ownership of the source code, cleanly documented and handed over. If you ever want to switch, you take everything with you — no lock-in.
  • Do you handle the app store release too?
    Yes, completely: developer accounts, store listing with copy and screenshots, the review process at Apple and Google. We know the pitfalls from more than 20 releases of our own — your app won’t fail over a formality.
  • What happens after launch?
    We stay on it: operation, monitoring, updates for new iOS and Android versions and further development — for a predictable monthly fee. An app without upkeep is outdated within a year; we’ve been running our own apps for years.
  • Can you take over and develop an existing app?
    Yes. We review the existing code, tell you honestly what it’s worth, and take over maintenance and further development — or recommend a rebuild if that’s cheaper than patchwork. We clarify this in the free intro call.
// Get started

Tell us your app idea.

A free intro call is all it takes. We tell you honestly what your MVP needs, what it costs — and what you can save yourself.

Prefer a quick message?

We’ll get back to you within 24 hours on business days — no obligation.

Call Enquire