Mobile apps for iOS and Android
Gjethe designs and builds mobile apps for iOS and Android, usually from one React Native codebase, or natively in Swift and Kotlin when an app depends on deep device features. We handle UX design, the backend and API, push notifications, in-app purchases, analytics and submission to the App Store and Google Play.
- Free first consultation
- Written quote for your project
- Flexible payment milestones
At a glance
- Platforms
- iOS and Android
- Approach
- React Native or native
- Launch
- Store submission included
- Pricing
- Quoted per project
Definition
What is mobile app development?
Mobile app development is the process of designing, building, testing and publishing applications for smartphones and tablets, together with the backend services those apps rely on.
A mobile app earns its place on someone's phone by being used regularly, booking again, tracking progress, ordering, checking in. We start from that habit: what will people do in the app every week, and what makes it faster than the alternative? Then we choose the technology that serves it, design the experience around thumbs and short attention spans, and take the app all the way through store review.
Who is it for?
Startups with an app-first product
The product lives on the phone (fitness, social, delivery, booking) and needs to feel polished from day one.
Businesses with loyal customers
Customers order, book or check in often enough that an app saves them time and keeps you top of mind.
Companies with field teams
Staff need an app for jobs, inspections, deliveries or check-ins, often with offline support.
SaaS products adding mobile
Your web app's users want a companion app for notifications and quick actions.
What's included, and what you keep
What's included
- Product and feature planning
- UX and UI design for iOS and Android conventions
- Clickable prototype
- App development: React Native or native
- Backend and API development
- Authentication and user profiles
- Push notifications
- In-app purchases or payments
- Offline support where needed
- Analytics and crash reporting
- Testing on real devices
- App Store and Google Play submission
What you receive
Handed over at the end. Yours to keep.
- Apps published under your developer accounts
- Source code for the apps and backend
- Backend deployed on your cloud account
- Store listings: screenshots, descriptions, privacy details
- Design files and prototype
- Release and update documentation
React Native or native development?
| React Native | Native (Swift / Kotlin) | |
|---|---|---|
| Codebases | One shared codebase for iOS and Android | Two separate codebases |
| Best for | Most business, consumer and content apps | Apps built around advanced device features or heavy graphics |
| Look and feel | Native components; very close to fully native | Fully native |
| Cost and maintenance | Lower: features built once | Higher: features built twice |
What happens during store submission?
Apple and Google review every app before it goes live and check updates too. Reviews look at functionality, content, privacy disclosures and whether in-app payments follow store rules. Rejections are common for first-time submissions and usually concern missing privacy information, unclear account deletion or payment flows.
We prepare everything reviewers need: privacy labels, test accounts, explanations of permissions, account deletion inside the app and store listings. Apps are published under your own developer accounts, so you own the listings and the reviews.
What kinds of apps do we build?
Booking and ordering
Appointments, tables, classes and repeat orders with payments and reminders.
Health and fitness
Workout tracking, programmes, progress and wearable integrations.
Field service and logistics
Jobs, routes, photos, signatures and offline sync for teams on the move.
Community and social
Profiles, feeds, messaging and moderation tools.
What to prepare before an app project
- A one-line description of who the app is for and what they'll do weekly
- Your developer accounts for Apple and Google, or permission to create them
- Brand assets: logo, colours and fonts
- Any existing backend, API or data the app must use
- How the app will make money, if it will
- Competitor apps you like or dislike, and why
How mobile app development works, step by step
Every step has a clear output you can review. Timing is agreed in your quote.
- 1
Discovery
Users, core habits, platforms, integrations and monetisation agreed and written into a scope.
- 2
UX and prototype
Flows and screens designed for both platforms and tested as a clickable prototype.
- 3
Backend first
Data model, API and authentication built so the app has a solid foundation.
- 4
App development
Features built and shared as test builds through TestFlight and Google Play testing tracks.
- 5
Testing
Real-device testing across screen sizes and OS versions, plus crash and performance checks.
- 6
Store launch
Listings, privacy details and submission handled until the apps are live.
Tools, and what shapes your quote
Pricing is based on your project and agreed in your quote. These are the things that move it.
| Factor | Why it matters |
|---|---|
| Number of screens and flows | Each flow (onboarding, booking, profile, settings) needs design, build and testing on both platforms. |
| Backend complexity | Apps with real-time data, matching logic or complex permissions need more backend work. |
| Device features | Camera, location, Bluetooth, health data or background tasks add development and review requirements. |
| Payments | In-app purchases and subscriptions must follow store rules and need extra testing. |
| Offline support | Working without a connection and syncing later adds significant logic. |
| Native or cross-platform | Two native codebases cost more than one React Native codebase. |
| Integrations | Wearables, CRMs, maps or payment providers each add work. |
| Area | Tools |
|---|---|
| Cross-platform | React Native, Expo, TypeScript |
| Native | Swift, SwiftUI, Kotlin, Jetpack Compose |
| Backend | Node.js, PostgreSQL, Firebase, Supabase |
| Services | Firebase Cloud Messaging, RevenueCat, Stripe, Sentry |
| Release | TestFlight, Google Play Console, EAS Build |
Common mistakes to avoid
What we see go wrong most often, and how a good project avoids it.
Building an app nobody opens twice
If the product isn't used regularly, a mobile website or PWA may serve better. Plan for the repeat habit.
Asking for every permission at launch
Requests for location, notifications and contacts on first open get declined. Ask when the benefit is obvious.
Forgetting store rules
Account deletion, privacy labels and in-app payment rules are review requirements, not optional extras.
No analytics or crash reporting
Without them, you won't know why users leave or which devices crash.
Treating launch as the finish line
OS updates, store policy changes and user feedback mean apps need ongoing updates.
Frequently asked questions
Do I get both an iOS and an Android app?
Yes. With React Native both apps come from one codebase and launch together; with native development we build each separately.
Do you publish the app to the stores?
Yes. We prepare listings, privacy details and test accounts and handle submission and review for the App Store and Google Play under your developer accounts.
Can the app work offline?
Yes. We can store data on the device and sync it when the connection returns, which is essential for field and travel use.
Do you build the backend too?
Yes, the API, database, admin panel and notifications service, deployed on your own cloud account.
Can you add subscriptions or in-app purchases?
Yes, following Apple and Google's rules, typically using RevenueCat to manage subscriptions across both stores.
How do updates work after launch?
Updates go through store review like the first release. Small JavaScript changes in React Native apps can sometimes be shipped over the air.
Should I build a PWA instead?
If users don't need the app weekly or deep device features, a progressive web app can be cheaper and faster. See our PWA vs native comparison.
Who owns the app?
You do: the code, the developer accounts, the listings and the user data.
Can you redesign or take over an existing app?
Yes. We audit the code, dependencies and store listings, fix stability issues and then continue development or redesign the experience.
How do you protect user data in the app?
Sensitive data is stored in the platform's secure storage, communication uses encrypted connections, and the app only requests the permissions it needs. Privacy declarations to Apple and Google match what the app actually does.
Related services
iOS App Development
iPhone and iPad apps that follow Apple's guidelines.
Android App Development
Android apps for the full range of devices.
React Native Development
Cross-platform apps with native modules where needed.
UI/UX Design
Research, wireframes, prototypes and interfaces.
App Store Optimization
Listings that rank and convert in the stores.
Progressive Web Apps
Installable web apps with offline mode and push.
Mobile App Development by industry
Start your app project.
Tell us what you need. You get an honest assessment, a clear plan and a written quote. The first consultation is always free.
- What happens next
- 1You tell us what you need
- 2We aim to reply within 24 hours with questions
- 3You get a written quote for your project