
Migrate from Native to Cross-Platform




.png)








.png)




Why Migrate From Native to Cross-platform?
Cut development costs by 30-50 %
Switching from separate iOS and Android teams to a single cross-platform app development workflow dramatically reduces expenses. One codebase means fewer resources and lower long-term maintenance costs.
Speed Up Your MVP Launch
Build and release one MVP for both iOS and Android at the same time. Using Kotlin Multiplatform (KMP) or Compose Multiplatform (CMP), you validate your app idea faster and reach users on both platforms sooner, reducing time to market.
Simplify Your Maintenance and Updates
Manage a single shared business-logic codebase so every bug fix, security patch, or new feature rolls out simultaneously across iPhone and Android. This streamlined approach cuts long-term costs and keeps your app stable.
Deliver a Consistent UX
Provide a native-like look and feel across devices with one unified design system. Your brand stays recognizable and users enjoy the same high-quality experience whether they’re on iOS or Android.
Shared Code
We'll Recommend the Best Migration Technology
Ideal when you need to stay within budget while keeping native UI flexibility.
KMP allows you to share business logic across iOS and Android while still using native UI components,speeding up development without sacrificing performance.
Perfect for teams that want a modern, shared UI and business logic in one codebase.
CMP enables you to build beautiful, responsive interfaces for both iOS and Android, reducing maintenance and accelerating releases.
If not knowing what to choose, here you can get more info about KMP vs CMP.
Best for apps requiring a fully shared UI across iOS and Android, ensuring fast cross-platform development with near-native performance and a rich widget library.
A solid choice for projects that need quick time-to-market and strong community support,offering
a balanced mix of speed, performance, and reusable components.
Apps We Built For Clients
All Technologies
We Work With
And Yes, We’ve Probably Worked In Your Industry
%201%20(1).avif)
Launch healthcare apps patients actually use, fast and secure.
%201.avif)
Turn AI ideas into apps that wow your users.
%201.avif)
Keep learners engaged with interactive and easy-to-use apps.
%201.avif)
Boost user engagement and loyalty with beauty apps.
%201.avif)
Make every event easy, from schedules to ticketing.
%201.avif)
Connect customers to services instantly.
%201.avif)
Build an app that fits your industry’s unique challenges.
Our Development Process
We start by listening to your goals and specific needs, ensuring we understand your app’s vision clearly.
Based on the gathered information, you get a detailed project plan, including a precise timeline, cost estimation, and defined milestones, ensuring full transparency.
Our team begins the design and development phase, keeping you involved at every stage with regular progress updates and the opportunity for feedback to ensure alignment with your goals.
Before launch, the app goes through rigorous testing to ensure it meets the highest standards of functionality, performance, and user experience, eliminating bugs or issues.
Once everything is ready, we take care of the deployment process, making sure it’s properly set up on app stores or other platforms.
After launch, we offer continuous support to ensure your app stays up-to-date and runs smoothly, adapting to your needs over time.
FAQ
Migration doesn't have to mean rewriting everything from scratch. The most common approach is incremental, you start by extracting shared business logic into a cross-platform layer (KMP is the best fit for this), while keeping your existing native UI intact. From there, you migrate module by module, based on priority and risk. Aetherius handles the full migration process, from codebase assessment to final delivery, without disrupting your active development.
It depends on your existing codebase and what you want to preserve:
- KMP — best when you want to keep native UI on both platforms and only share business logic. Lowest risk, most gradual migration path.
- Compose Multiplatform — best when you want to share both UI and logic, and your team is already Kotlin-native.
- Flutter — best when you're ready for a full rewrite and want a consistent UI across platforms with faster delivery going forward.
- React Native — best when your team has strong JavaScript expertise and you need fast time-to-market on both platforms.
Not sure which fits your situation? Get in touch and we'll assess your codebase before recommending anything.
It depends on the complexity of your codebase, the number of modules, and the target framework. Incremental KMP migrations can start showing results within the first few weeks, while a full Flutter rewrite of a complex app can take several months. After reviewing your project, we provide a detailed timeline before any work begins, no vague estimates.
Not if done correctly. KMP and Compose Multiplatform preserve native performance because the UI remains native on each platform. Flutter delivers near-native performance in most production scenarios. The risk is in how the migration is executed, a poorly planned rewrite can introduce regressions. Our engineers assess your app before migration and flag any performance-sensitive areas upfront.
Yes. An incremental migration approach allows your team to keep shipping features on the native app while the migration happens in parallel. We structure the migration so it doesn't block your delivery commitments to existing clients. Read the step-by-step guide on how to integrate KMP into an existing app without a full migration.
Every Aetherius engineer goes through technical screening covering architecture knowledge, code quality, and experience with complex, enterprise-grade codebases. We don't assign junior developers to production migrations. If a profile isn't the right fit for your specific stack and risk level, we say so before the engagement starts.
It depends on how much you want to stay involved:
- Team Augmentation — our engineers work alongside your existing team, embedded in your workflows. Best when you want full control and visibility over the migration.
- Outsourced Team — a dedicated team owned by us handles the migration end-to-end. Best when you want results without the management overhead.
- Sprint-Based — migration work scoped and delivered sprint by sprint. Best when you need flexibility to pause, reprioritize, or scale the effort based on project demands.
Cost depends on the size and complexity of your existing codebase, the target framework, and how much of the app needs to be rewritten versus preserved. We don't give flat estimates without understanding the project. Use the Aetherius Cost Calculator for a starting point, or get in touch and we'll assess your codebase and give you a realistic breakdown.
Tell us about your project
You’re one step away from getting the right developers.















.png)










