Should a mobile app be cross platform or native?

Cross platform development suits most apps, because one codebase serves both iOS and Android at roughly half the cost of two native apps. Native development is worth the extra cost only when an app depends heavily on device hardware, advanced graphics or platform specific features.

Do Apple and Google charge app store fees separately?

Yes. Apple charges an annual developer fee and Google charges a one time registration fee, both separate from CoreFinity Tech's price and paid on the client's own accounts so the app is registered to the client's business.

How long does App Store and Google Play approval take?

App store review usually takes a few days per store, and a first submission is often rejected over a minor guideline issue. CoreFinity Tech builds that resubmission round trip into the project timeline.

Can a mobile app work offline?

Yes, many mobile apps can work offline, but offline support changes how the data layer is designed. It should be raised in the project brief rather than added after the build has started.

Mobile App Development: Apps for iOS and Android, one codebase.

Cross platform apps, plus the backend and admin tooling that has to exist behind them.

Talk to an engineer

An app is rarely just an app. Behind the screens people tap there is an API, a database, an admin panel somebody uses to manage content, push notifications, and an account system. Quotes that cover only the screens tend to grow later.

We build the whole thing, and we build it cross platform, so iOS and Android come from one codebase rather than two teams solving the same problem twice.

( What this covers )

Mobile App Development, in practice

Cross platform builds

One codebase producing both iOS and Android apps. Roughly half the build cost of writing each natively, and one place to fix a bug.

The backend behind it

APIs, database, authentication and file storage, designed alongside the app rather than bolted on once the screens are done.

Admin tooling

A web dashboard for your team to manage content, users and orders, so changing something in the app does not require a developer.

Push notifications

Set up properly, with the permission flows and scheduling that make people keep them switched on.

Payments and subscriptions

In app purchases where the stores require them, Stripe where they do not, and the receipt handling both need.

Store submission

App Store and Play Store listings, review guidelines, privacy declarations and the resubmissions that usually follow a first rejection.

( Worth talking to us if )

Any of this sounds familiar.

Your customers ask for an app and the mobile website is not enough
You need features a browser cannot reach, such as offline use or push notifications
You have a working web product and want a mobile companion to it
You were quoted separately for iOS and Android and want to understand why

( How we work )

The shape of a typical build

01
Decide what version one is
App stores punish abandoned apps. We agree the smallest version worth shipping, then plan what follows it.
02
Design the screens
Mobile design is its own discipline. Screens are agreed in Figma, including the states people hit when something goes wrong.
03
Build app and backend together
Both progress side by side, with builds you can install on a real device as they are made.
04
Submit and support
We handle submission to both stores and the first round of review feedback, which almost always comes.

( What you end up owning )

Everything, and no strings.

The app repository and the backend repository
Figma source files
Signing keys and store listing access, transferred to your accounts
The database and its documentation
Build and release instructions any competent developer can follow

( Built with )

React Native
Expo
TypeScript
Node.js
PostgreSQL
Firebase
Stripe

Mainstream tools with deep talent pools, chosen so you are never dependent on us to maintain what we built.

Questions about Mobile App Development

Should a mobile app be cross platform or native?: Cross platform development suits most apps, because one codebase serves both iOS and Android at roughly half the cost of two native apps. Native development is worth the extra cost only when an app depends heavily on device hardware, advanced graphics or platform specific features.
Do Apple and Google charge app store fees separately?: Yes. Apple charges an annual developer fee and Google charges a one time registration fee, both separate from CoreFinity Tech's price and paid on the client's own accounts so the app is registered to the client's business.
How long does App Store and Google Play approval take?: App store review usually takes a few days per store, and a first submission is often rejected over a minor guideline issue. CoreFinity Tech builds that resubmission round trip into the project timeline.
Can a mobile app work offline?: Yes, many mobile apps can work offline, but offline support changes how the data layer is designed. It should be raised in the project brief rather than added after the build has started.

( In practice )

Mobile apps case studies

All case studies

Fuel and energy / FuelSec

Every litre checked at the nozzle.

1 s between live readings during a fill

Tell us what you need building.

Send a brief and you get a written scope, a timeline and a fixed price back within 48 hours. It costs nothing and commits you to nothing.