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One core, every platform

Cross-platform does not have to mean one lowest-common-denominator UI. We put networking, crypto, sync and business rules into a single core, compile it for every platform, and build a native interface on top. Each app feels at home, and a fix lands everywhere at once.

Heavy logic lives in one shared core; each platform gets its own native interface. Android, iOS, macOS and Windows without four rewrites.

Discuss your project

What you get

  1. 01 Architecture session: what goes to the core, what stays native
  2. 02 Shared engine in Go or Kotlin Multiplatform with a clean API
  3. 03 Bindings for Android (AAR), Apple (XCFramework) and Windows (service or DLL)
  4. 04 Native UIs: Jetpack Compose, SwiftUI, WPF
  5. 05 One test suite for the core and platform smoke tests
  6. 06 Release pipeline that builds every platform from one commit

Why it works

  • 01

    Proven in production

    Reshu VPN runs one Go engine inside four native apps: Android, iOS, macOS and Windows.

  • 02

    Native where it matters

    Gestures, widgets, system settings and accessibility stay platform-native.

  • 03

    Cheaper to grow

    The second and third platforms reuse the hardest part of the work.

Tools we use

  • Go
  • gomobile
  • Kotlin Multiplatform
  • Jetpack Compose
  • SwiftUI
  • C# / WPF
  • JSON-RPC

Related work

How the project goes

The process in detail
  1. Day 1

    A brief instead of a call

    You fill in a short brief, we ask what is left in writing. The goal, the audience and the one thing the app must do well end up on a single page you can forward to anyone.

  2. Within 24 hours

    Estimate with a fixed price per stage

    Scope, timeline and a fixed price for each stage instead of an hourly meter. You know what the prototype costs before you decide on the rest.

  3. About a week

    Clickable prototype you approve

    Flows, then a clickable Figma prototype you tap through on your own phone. Comments go right on the screens. Nothing is coded until you say yes.

  4. Weekly

    Build in short sprints

    Every week you get the working app on your phone (TestFlight on iPhone, an APK on Android, a link for Mini Apps) and a short video of what changed.

FAQ

Questions about One core, every platform

Why not Flutter or React Native?

They are good for content apps. When the product lives on system APIs such as VPN tunnels, background sync and widgets, a shared core with native UI ages better. We will tell you honestly which fits your case.

Can we start with one platform?

Yes. We design the core from day one, launch on one platform and add others when the numbers say so.

Other services

Tell us about your app

No calls: fill in a short brief, and within 24 hours you get an estimate with a fixed price for each stage.

Fill in a short brief Write in Telegram