Mobile App Development Services
We build mobile apps that ship. React Native for speed, native iOS and Android when you need it, and nothing bloated in between.
We help you design, build, and launch your mobile app, or improve the one you already have. We work cross-platform with React Native and natively with Swift and Kotlin. We also ship our own apps: our language-learning app Tanaroom is live in the App Store.
What we do
Cross-platform apps with React Native
One codebase for iOS and Android. React Native with Expo and EAS Build is our core stack: it keeps development fast, keeps both apps in sync, and still feels native to users.
Native iOS and Android development
When a product needs to go native, we build with Swift and Kotlin. We recommend native or cross-platform based on what your product actually needs, not on habit.
Complex features, built properly
Chats, maps, AR, subscriptions, in-app purchases, push notifications, deep links, analytics, and authentication. These are the parts of an app that are easy to underestimate and hard to retrofit, so we design them in from the start.
Architecture and backend integration
We design the app architecture for the long run and connect it to the backend it needs, whether that is your existing API or a new one we build with Node.js, NestJS, and TypeScript, exposed as REST or GraphQL.
Release and store submission
We take the app through testing, store review, and launch on the App Store and Google Play. From architecture to release, one team owns the whole path.
App improvement and redesign
Already have an app? We audit it, update outdated interfaces, improve usability, optimize performance, and add the features your users are asking for.
How we work
Every mobile project follows the same six steps, so you always know where your app stands.
- 01
Discovery
We talk through your idea, goals, and constraints, and define what the app needs to do for its first release.
- 02
Research
We look at your users, your market, and the platform requirements to choose between React Native and native before any code is written.
- 03
Design
Our product designer turns user flows into wireframes, then into a clean, intuitive mobile UI you can click through as a prototype, with motion in Lottie where it adds to the experience.
- 04
Development
We build the app in short iterations, from architecture and backend integration to the features your users actually touch.
- 05
Testing
We test on iOS and Android hardware before launch, not just simulators, so real edge cases do not reach users.
- 06
Launch
We handle App Store and Google Play submission and stay available for fixes and improvements after release.
Why OKET
You talk directly to the founders, the same two people who design and build your app. No account managers, no bureaucracy.
Fast decisions and fast delivery. Small team, short feedback loops, no waiting on sign-off chains.
Full flexibility in scope, scheduling, and collaboration: hire us as a team of two or as individual specialists.
A transparent workflow from the first conversation to the store release.
Technologies we use
- React Native
- Expo
- EAS Build
- Swift
- Kotlin
- TypeScript
- Redux
- GraphQL
- Node.js
- NestJS
- Push Notifications
- In-App Purchases
- Firebase
- Sentry
- AWS
- Lottie
FAQ
How much does it cost to build a mobile app?
Scope drives it: the features, the platforms, and how polished the first release needs to be. One React Native codebase covering both platforms also means one codebase to maintain - we walk through that trade-off with you on the first call and agree on the budget after discovery, before development starts.
How long does it take to build an app?
It depends on scope. A focused first version ships faster than a feature-complete app. After discovery we give you an estimate based on your actual feature list, not a generic promise.
Should I choose React Native or native iOS/Android?
For most products React Native is the practical choice: one codebase for both platforms, faster iterations, and native modules where needed. When a project genuinely needs native, we build with Swift and Kotlin. We recommend one or the other after discovery, based on your product, not our preference.
Can I see apps you have built?
Yes. We build our own products alongside client work. Our language-learning app Tanaroom is free in the App Store, so you can download it and judge the quality yourself: the flashcards, the design, the fox. We are happy to walk you through how we built it on a call.
Can you improve an existing app instead of building from scratch?
Yes. We audit your current app, update outdated interfaces, improve usability, optimize performance, and add new features. This works whether the original app was built by us or by someone else.
Ready to build your mobile app?
Book a free consultation. We will talk through your idea, help you scope it, and tell you honestly what it takes to ship.