Cross-platform apps with Kotlin Multiplatform
One codebase for data, networking, and business rules, shared by your iOS and Android apps.
Cross-platform mobile apps · Richmond, VA
One app for iPhone and Android, built to last.
We build cross-platform mobile apps with Kotlin Multiplatform, React Native, and Flutter: one shared codebase, screens that feel at home on each platform, and release to the App Store and Google Play.
Mobile App Development
What we build
Bringing an Android app to iOS
Reuse the Kotlin code you already have and add an iOS app step by step, without a full rewrite.
React Native & Flutter apps
Cross-platform apps in React Native or Flutter when they suit your team, your timeline, or an existing codebase.
App backends & admin panels
APIs and content management on Node.js, so your team can run the app without developers.
MVPs for startups
A focused first version on both platforms, so you can test your idea with real users.
Updates & maintenance
New OS versions, security updates, and improvements after launch on a monthly plan.
Choosing a framework
The right cross-platform tool for your app.
Most of an app’s complexity sits below the screens: data, sync, payments, and business rules. Kotlin Multiplatform lets us write that once and use it in both apps, so features and fixes reach iPhone and Android users together.
The screens can be shared with Compose Multiplatform, or built natively when a platform-specific experience matters. Because the shared code is plain Kotlin, it fits naturally with existing Android projects and can be adopted one feature at a time.
React Native, written in JavaScript or TypeScript, is a good fit when your team already works with React or the app shares code with a web product. Flutter draws its own interface from a single Dart codebase, which suits apps with a highly custom design that should look the same everywhere. We recommend one after understanding your app, your team, and any code you already have.
Is this for you?
A good fit if…
- You need an app on both iPhone and Android without paying for two separate builds.
- You already have an Android app and want an iOS version.
- You want apps that feel native, not like a website in a wrapper.
- You need the app, its backend, and an admin panel built by one team.
Featured project
Octi: a vehicle rental marketplace for Switzerland
Octi lets people and businesses across Switzerland rent vans, pickups, and trucks from vetted rental companies. We built the whole product end to end.
Read the case study →- WebsiteThe public website where customers discover vehicles and services and get in touch.
- Mobile app for iOS & AndroidOne Kotlin Multiplatform app for iPhone and Android, launching soon.
- Custom CMS & Node.js backendA content management system and API built on Node.js, so the Octi team can manage the platform without developers.
How we work
From first call to launch.
1
Plan the app
We define your users, key screens, and the smallest version worth launching on both platforms.
2
Design & develop
We design the interface, build the shared code and screens, and test on real iPhone and Android devices in short cycles.
3
Launch & grow
We handle App Store and Google Play release, then monitor, fix, and add features on a monthly maintenance plan.
Clients we’ve worked with
- OctiWebsite, iOS & Android app, and custom CMS · Switzerland
- Brentwood Muslim Community CenterCommunity website redesign · in progress
FAQ
Common questions
What is Kotlin Multiplatform?
Kotlin Multiplatform (KMP) lets one codebase hold the logic both apps need, such as data, networking, and business rules, and run it on Android and iOS. The screens can be shared too, or built natively where that gives a better experience.
Is Kotlin Multiplatform ready for production apps?
Yes. JetBrains declared Kotlin Multiplatform stable in November 2023, and Google supports it for sharing business logic between Android and iOS.
Should we choose Kotlin Multiplatform, Flutter, or React Native?
We build with all three. Kotlin Multiplatform suits native-feeling apps and teams with existing Android or Kotlin code. React Native suits teams that already use React. Flutter suits apps with a highly custom design. We recommend one after understanding your project.
Can you turn our existing Android app into an iOS app?
Often, yes. If your Android app is written in Kotlin, we can move its logic into a shared module step by step and build the iOS app on top of it, instead of starting again from scratch. We review the code first and tell you what is realistic.
Do you publish apps to the App Store and Google Play?
Yes. We prepare the store listings and handle the submission and review process with you.
How much does a mobile app cost?
It depends on scope, platforms, design, and integrations. Our guide to app costs explains what drives the price, and after a discovery call we share a plan and estimate before any work starts.
Have a project in mind?
Book a free 30-minute discovery call. We’ll talk through your goals and suggest practical next steps.