// 01
Dual-codebase assessment
Before anything, we read both the Swift and Kotlin apps and tell you, in writing, where they diverge, what carries over cleanly, and what the port will take. If the numbers say stay native, we say so.
swift · kotlin · two codebases · one team
Native iOS & Android to Flutter
Two native apps means two codebases, two teams, two release trains - and double the burn to keep them in step. They drift anyway: a feature lands on iOS, lags on Android, and users feel two different products. We port both into one Flutter codebase your whole team ships, incrementally, with both apps live the entire way.
why this exists
The cost of shipping the same app twice.
Every feature gets built twice, tested twice, and shipped on two release trains by two teams who hire, plan, and debug apart. The platforms drift no matter how disciplined you are - and your users feel two different products.
We port both apps onto utopia_hooks in Screen · State · View - the architecture we build every app on, ours included - so one team ships iOS and Android together and the capacity you spent staying in sync goes back into the product.
We port both apps onto utopia_hooks in Screen · State · View - the architecture we build every app on, ours included - so one team ships iOS and Android together and the capacity you spent staying in sync goes back into the product.
what we do
How we get you to one codebase.
// 02
Incremental port
We rebuild screen by screen behind your running apps, so you keep shipping to users on both platforms while the codebase converges - both apps stay live through the port.
// 03
Native performance & platform reach
Flutter compiles to native on both platforms, and where you need a real platform API we keep the native bridge - so nothing you had on Swift or Kotlin gets left behind.
// 04
One design system across platforms
The drift ends here: iOS and Android share one set of components and one source of truth, so a change lands on both at once instead of being rebuilt twice.
// 05
Hand-over & enablement
When it ships, the code is yours: Flutter your native engineers can grow into. No platform lock-in, yours at hand-over.
the port, step by step
From two codebases to one.
- 01
Assess
We read both native apps and report, in writing, where they diverge, what carries over, and what the port will take.
- 02
Plan
We agree what to port first and in what order, so both apps keep shipping to users the whole way through.
- 03
Port
We rebuild on one Flutter codebase, and you review progress screen by screen.
- 04
Reach parity
We close the gap until iOS and Android match what you had and stop drifting - one feature, one place, both platforms.
- 05
Hand over
The codebase is yours - readable, documented, maintainable. One team takes it from here, with no lock-in.
how we judge it
Where iOS and Android actually diverge, in writing.
Before we port a line, we read both the Swift and the Kotlin app and map where they diverge, what carries over cleanly, and what the port will take. You get that comparison as a document your team can challenge - and the decision stays yours.
common questions
Questions we get asked.
Can we migrate incrementally with both apps staying live?
Yes - that is the default, not an option. We port screen by screen behind the running apps, so both platforms keep shipping to users while the codebase converges. There is no freeze and no big-bang cutover.
Do we lose native-only features in the port?
No. Flutter compiles to native on both platforms, and where a feature genuinely needs a native API, we keep the native bridge rather than drop the capability.
Our two apps have already drifted in features - how do you handle that?
The dual-codebase assessment surfaces exactly where iOS and Android diverge before any porting starts, in writing. We agree with you which version becomes the source of truth for each drifted feature, then port to that.
What happens to our native iOS and Android engineers?
That is a decision for your team, not ours - some clients retrain native engineers onto the Flutter codebase, others keep them on native work elsewhere. We hand over documented, conventional Flutter either way, so the option stays open.
How do you confirm performance parity before cutover?
We reach feature and behaviour parity screen by screen before anything old is retired, so users feel no difference at cutover - the port is validated against what the native apps already do, not against a spec.
talk to us
Send us both apps. We'll tell you what the port takes.
Send both repos, or just tell us what you maintain today. A founder reads it and replies within 24 hours.
Read our case studies