Short answer: custom mobile application development means a team owning the app, the backend it talks to, the release pipeline and the store presence together. For most products a small senior cross-platform team ships faster and cheaper than a large mixed one, and the contract should be a fixed, bounded first version rather than an open hourly engagement.
What a custom mobile app actually is
People buy "an app" and receive four things: the client on the device, an API and data model behind it, a release and signing pipeline, and an operational surface — crash reporting, analytics, remote configuration, forced-upgrade handling.
The fourth is what separates a demo from a product. An app without forced-upgrade handling means every breaking API change has to support every version ever installed. An app without crash reporting means your bug reports arrive as one-star reviews.
When you scope a build, insist all four appear in the contract. If only the first does, the price is not lower — it is just incomplete.
Native or cross-platform
The honest rule of thumb, after a decade of building both:
Cross-platform — one codebase for iOS and Android — is right for marketplace apps, booking and ordering flows, driver and field apps, dashboards, social products, anything where the screens are the product. You get two platforms for roughly 1.4x the cost of one, and every fix lands on both at once.
Native is right when the product lives in the hardware. Sustained background location over a working day. Bluetooth peripherals and industrial devices. Heavy camera or audio capture. Deep platform wallet and payment integration. In those cases the cross-platform layer becomes something you fight, and fighting a layer is the most expensive kind of work there is.
We have shipped both. Vehicle tracking and taxi dispatch apps ran up against background-location behaviour that is genuinely platform-specific; consumer marketplaces did not.
Choose native for a hardware reason, never for a resume reason. "Native is faster" stopped being a useful sentence around 2019.
What a senior-only team changes on mobile
Mobile punishes mistakes more than web does. A bad web data model is redeployed on a Tuesday afternoon. A bad mobile data model is sitting on ten thousand devices you do not control, and unwinding it means a migration that runs over the air, tolerates users who never update, and cannot be rolled back.
That asymmetry is why we do not staff mobile work with juniors supervised by a lead. The decisions that matter — offline behaviour, sync conflict resolution, what happens on a train through a tunnel, how the token refresh behaves when the app has been backgrounded for a week — are all made in the first fortnight, by whoever is writing the code.
Practically, that means our mobile teams are three to five people, all senior, and the people who scoped your app are the people who ship it.
Fixed-price contracts for custom mobile work
A fixed price is not a slogan, it is a document. Ours works like this:
1. A paid scoping week. We turn your intent into acceptance criteria — screen by screen, state by state, including the empty, offline and error states that briefs always omit and budgets always break on.
2. A bounded first version at a fixed €9,500. Real users, both stores, crash reporting, analytics, CI, and documentation. Not a prototype.
3. A published change-request rate of €450 a senior day, so changing your mind has a number rather than a negotiation.
4. A monthly dedicated team at €7,000 if the roadmap continues after that.
Compare that with a marketplace quote of "€4,000 for an app". That price is real, and it buys a client binary. It does not buy the backend, the store submission, the signing infrastructure, the crash handling, or anyone to call in month four.
Startups on a strict budget
If money is genuinely tight, the right move is not a cheaper team. It is a smaller first version.
Cut to the single loop that proves the business: one user type, one journey, one payment path. Ship that to a real store with real users in weeks. Everything else — admin panels, second user roles, notification preferences, settings screens — is a hypothesis you can afford to test later, and half of it will turn out to be unnecessary once real people use the thing.
We would rather build a tight €9,500 first version that teaches you something than a €40,000 build of a spec written before anyone had evidence.
Before you sign
Ask for the store accounts to be yours. Ask for the repository to be yours from the first commit. Ask which named engineers will be on it in month nine. Ask to see two apps the team shipped that are live in the stores today.
Our own record is open: fleet and mobility platforms, taxi and ridesharing apps for national operators, smart parking and smart wallet products, and agentic AI tools in production. See the work, or tell us about the app.
Frequently asked
Native or cross-platform for a custom mobile app?
Cross-platform for most business and marketplace apps — one codebase, two stores, faster iteration. Native when the product lives in the hardware: sustained background location, Bluetooth peripherals, heavy media capture, or platform-specific payment and wallet behaviour.
What does a custom mobile application cost?
A bounded first version with real users runs €9,500 at our fixed-slice price; a continuing dedicated senior team is €7,000 a month. Marketplace bids of a few thousand euros do not include store submission, crash handling or the backend the app talks to.
Why does senior-level engineering matter more on mobile?
Because mobile mistakes are expensive to unwind. A bad data model ships to devices you no longer control and has to be migrated over the air. Web mistakes are redeployed in an afternoon; mobile mistakes live in the field for months.
Who submits the app to the stores?
We do, from your developer accounts, with the certificates and signing keys in your organisation's name. Never let an agency hold your store accounts — it is the most common way companies lose control of a shipped product.