Is it one app for iOS and Android?

Yes. I build with Expo, so both stores come from one codebase. A web companion can sit on the same backend when the product needs it.

Do you handle the App Store and Google Play?

I prepare the builds and the listing assets. You own the developer accounts. I will walk through submission with you rather than holding the accounts myself.

What if the app has to work offline?

That is a normal requirement, not an extra product. Offline Arcade is an example of data that lives on the device and syncs when a connection comes back.

How long does it take to build an app with Expo?

A small app with accounts and one main job is often a couple of months, split into weekly sprints. Store review, sign-in and payments are part of that, not a surprise at the end. The first call is where that range becomes a date.

What changes the cost of an app?

iOS and Android from one codebase is the usual shape. Accounts, payments, offline use and a web companion are what add scope. There is no public price list. After a call I send a fixed quote for an agreed first version.

App developer UK

iOS and Android apps, and the web apps that sit beside them, built with React Native and Expo.

If the product lives on a phone, it should share its data with the site rather than becoming a second system. I build the app, the account system and the web companion together.

Start a project

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OfflineiOS and Android

Where it hurts

Customers are booking by message because there is no app, and the website is doing a job it was not built for.
An earlier app and the website do not share accounts, so every change is made twice.
Store submission, sign-in and payments are the parts that keep slipping.

What you get

iOS and Android from one Expo codebase, including store builds.
Accounts, payments and offline use when the product needs them.
A web app on the same backend, so the work is not trapped inside the stores.

Stack

Expo
React Native
Supabase
Stripe
RevenueCat

What drives the cost

There is no public price list. These are the things that change the quote. After a call I send a fixed price for an agreed scope.

Whether you need iOS, Android, or both, and whether a web companion sits beside them.
Accounts, payments, and anything that has to work offline.
Store listings, which stay in developer accounts you own.

React Native and Expo

iOS and Android come from one Expo codebase, including the store builds. A web app can sit on the same backend, so accounts and data are not split across two products. Offline Arcade and the Martyna app are built this way.

A good fit if

A service that customers should book from their phone
A product that has to work with a poor connection
A web product that now needs a native app

Related work

Martyna Styling

Booking, payments, journal and newsletter for a London personal stylist, with a companion app on the same backend.

Next.jsSupabaseStripeResendExpo

Offline Arcade

Offline-first arcade games for iOS and Android, with cloud save, ads and in-app purchases.

ExpoSQLiteSupabaseRevenueCatAdMobThree.js

SpursGG

Tottenham fan hub for news, fixtures, predictions and squads, on the web and as a native app.

ReactViteSupabaseExpo

MT Games

Mini-games with shared leaderboards. Playable in the browser on miketaylor.ai and in an Expo app.

ExpoReact Three FiberSupabase

VERSUS

Esports tournament platform for teams and competition, live at versusgaming.gg, with a Next.js and NestJS rebuild in progress.

ReactFirebaseNext.jsNestJSPostgreSQLSupabase

Antstream

Marketing site, subscription accounts and the cloud arcade client for Antstream Arcade, plus an interactive story about the history of game controllers.

ReactViteNext.jsThree.jsStripePayPal

TCG Tracker

Tournament results, player profiles and community leagues for trading card games, starting with Dragon Ball Fusion World.

Next.jsSupabaseDiscordVercel