React Native apps

One app. iPhone and Android.

One codebase for iOS and Android with native performance — the fastest way to ship a quality mobile product on both platforms. Free working prototype in 1 day, then a production release at a fixed price and date.

React NativeExpoTypeScript

Get your free prototype 30-min call · no commitment

9:41

Orders

Linen shirt2 items · Paid$84

Desk lampShipped$129

Ceramic setDelivered$46

9:41

Orders

Linen shirt2 items · Paid$84

Desk lampShipped$129

Ceramic setDelivered$46

OrderCard.tsxAI

export function OrderCard({ order }) {

return (

<Text style={s.title}>{order.name}</Text>

</Pressable>

)

}

Senior review · approved

Pipelinemain

BuildiOS + Android
Testspassed
Senior review
BetaTestFlight · Play
Storessubmitted

Buildto launch

Day 1Week 1Week 2Week 3Live

Orders 1.0 is liveApp Store and Google Playnow

At a glance

One product. One price, one date.

The essentials, before you book a call.

UDEX builds React Native apps for founders and product teams. One codebase for iOS and Android with native performance — the fastest way to ship a quality mobile product on both platforms. AI writes the code, tests and CI/CD, while senior engineers own the architecture and review every change.

1 dayFree prototypeNo payment, no commitment

FixedPrice and dateAgreed before we start

100%YoursCode, repository and accounts

Platform: iOS and Android from one codebase
Ships to: The App Store and Google Play
Stack: React NativeExpoTypeScriptReanimatedEAS
Quality: Senior review on every change, automated tests, CI/CD

How it works

Idea to production. In three steps.

AI does the heavy lifting. Senior engineers make every decision that matters.

01Day 0
Share the idea
A 30-minute call. We agree on the core flow, the scope and a fixed release date.
02Day 1 → release
AI builds, senior engineers decide
AI writes the code, tests and CI/CD. Senior engineers set the architecture and review every change. Your prototype is ready on day 1.
03Release day
Ship to the App Store and Google Play
The release goes live, and the code, repository and accounts are handed to you.

Who it’s for

Built for founders and product teams.

Here is where it works best, and where it doesn’t.

Startups launching on both platforms

Ship iPhone and Android together instead of one after the other.

Teams working in React

Share people, patterns and code with your web product.

Marketplaces and booking

Both sides of the product on both platforms, on one stack.

Consumer subscription apps

Fast iteration with over-the-air updates between store releases.

Founders on a tight timeline

One codebase means one team and one release schedule.

Companies consolidating apps

Replace two separate native apps with one maintainable codebase.

Not the right fit

Graphics-heavy games and 3D.
Apps that depend on brand-new OS features on day one.
Certified compliance from day one, such as HIPAA or PCI audits.
Open-ended hourly work without a defined first release.

How we work

Six stages, one team.

All services

Pricing

Start free. Ship at a fixed price.

Two steps. The prototype costs nothing, and the release costs exactly what we agree.

Prototype

Free1 day

A working prototype of your core flow to test with users and show investors.

Key screens and the main user flow
Working on real devices and browsers
No payment, no commitment

Get the free prototype

Release

Fixed priceand date, agreed upfront

A production release, shipped to the App Store and Google Play, that you fully own.

React Native, Expo, TypeScript and the features agreed on the call
Automated tests, CI/CD and senior code review
Release to the App Store and Google Play and 100% code ownership

Start with a call

Fixed means fixed. No hourly billing and no surprise invoices: anything new is priced before it is built.

Book a call

Thirty minutes. Then your prototype.

Walk us through the idea, and we will scope the core flow and build your free prototype the next day.

Book a 30-min call

FAQ

Questions, answered.

Straight answers about cost, timing, quality and ownership.

How much does it cost to build a React Native app?

The price is fixed for the agreed scope and set before work starts. You first get a free working prototype of the core flow in 1 day, then a fixed price and release date for the production version.

How long does it take to build a React Native app?

A working prototype takes 1 day. The production release date is agreed upfront and depends on the scope; AI speed with senior engineering makes it much faster than classic development.

Does a React Native app feel native?

Yes. Navigation, gestures and animations run natively, and we write native modules where performance matters.

Can you share code with our web app?

Yes. Business logic, types and API clients can be shared with a React or Next.js web app.

Can you update the app without a store review?

Small fixes and content changes can ship over the air. Larger changes go through normal store releases.

Is the prototype really free?

Yes, with no commitment. After a 30-minute call we build a working prototype of your core flow in 1 day, and then you decide whether to continue to the release.

Will the price go up during the build?

No. The price is fixed for the agreed scope. Anything new you want to add mid-build is priced separately and built only after you approve it.

Who owns the code?

You do, 100%. The source code, repository and accounts are yours, and the release ships to the App Store and Google Play under your name.

Is AI-written code safe to ship to production?

It ships only after senior review. Senior engineers own the architecture, security and code quality, and automated tests run on every change.

In practice