KOTLIN MULTIPLATFORM DEVELOPMENT

Cross-Platform App Development with Kotlin Multiplatform

Reusing your Android codebase with Kotlin Multiplatform, our team helps you launch high-quality iOS apps faster and more efficiently.

Sharing code across Android and iOS helps companies reduce development time and cost, increase app stability and capabilities, and simplify long-term maintenance.

Guaraná is a leading Kotlin Multiplatform app development company based in Toronto and Montreal, helping businesses extend their Android codebase to iOS efficiently. We specialize in building scalable, high-performance apps for both platforms using shared code, with a focus on transparency, maintainability, and speed to market.

Learn how you can accelerate your mobile development and reduce costs with our Kotlin Multiplatform solutions.

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A solid Team

Development Agency in Toronto & Montreal

At Guaraná, we use innovative technologies like Kotlin Multiplatform to build unique mobile applications that elevate businesses and grow communities of loyal users. Our engineers are leaders in the industry and understand the fundamentals required for a well-rounded, cross-platform application.

We start with an idea and then work with our clients to understand their industry, competitors, and the features that can transform their idea into a tangible app. We build simple and secure wireframes and incorporate the necessary technology to ensure your app performs seamlessly on its intended platforms. Our experienced Android developers play a key role in optimizing shared code for iOS through Kotlin Multiplatform.

When you work with a Guaraná iOS app developer in Montreal or Toronto, you can feel confident knowing you have a knowledgeable partner by your side every step of the way.

Features & Benefits of
using Kotlin Multiplatform
for your application
development

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Easier Maintenance

A unified codebase simplifies updates, bug fixes, and new feature rollouts. Our developers ensure your app remains stable, scalable, and easy to evolve over time.

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Faster Time to Market

With Kotlin Multiplatform, shared code between Android and iOS allows for faster development cycles. Our team helps you launch on both platforms without doubling the effort.

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Usable Everywhere

By reusing business logic and core functionalities across platforms, you minimize duplicate work—saving time, money, and resources throughout the project lifecycle.

Why working with us

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We are based in Canada and we get our work done here!

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We never venture in expensive or inefficient developments. We build the right amount of code for strongest features.

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We make the features of your app fit perfectly fit the business requirements.

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We are startup friendly, our prices are affordable!

When Kotlin Multiplatform
is the right choice

Complex Business Logic Across Platforms

Apps with heavy backend interaction, offline support, or custom algorithms (like fintech, healthtech, or logistics apps) benefit from KMP because the core logic can be written once and reused on both Android and iOS, ensuring consistency and reducing bugs.

Existing Native Apps Needing Feature Expansion

If you already have native apps and want to add cross-platform features incrementally (instead of rewriting everything), KMP lets you start small — like sharing networking, data storage, or authentication modules — without disrupting the existing native UI layers.

Startups Releasing MVPs on iOS and Android

For early-stage products aiming to launch fast on both platforms without doubling their dev costs, KMP lets a single team build shared logic while still keeping native UI. It speeds up development without compromising user experience.

Our Development process

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App Wireframing

One of the most important phases of mobile application development is crafting the wireframe. Our UX experts understand how to build smooth and user-friendly app frameworks to ensure your users stay engaged and have a great experience from start to finish.

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User Interface design

The aesthetic of a mobile app is extremely important. Our professional designers make sure your app looks and feels great with beautifully designed user interfaces. From the icon set to the layout of the complete user interface, our goal is always to enrich the end user’s experience.

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Kotlin App Development

Kotlin Multiplatform lets us write core logic once in Kotlin and automatically generate native Swift code for iOS. This shared approach simplifies updates, reduces bugs, and makes it easier to scale your app across platforms.

Our Expertise With Native Development

Since 2011, we've been creating hundreds of iOS and Android apps. Our skilled app developers are ready to guide you through each phase of our development process.

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Swift

Swift is the programming language of iOS. We call it native development. It allows us to build the strongest, fastest, most scalable iOS applications. This language is modern, and enables a level of interactivity in development. It contains a number of features such as closures, generics, and type inference that make it much easier to use, simplifying common patterns used in Objective-C.

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Kotlin

Kotlin is a modern, statically typed programming language developed by JetBrains and officially supported by Google for Android development. Known for its clean syntax, safety features, and full interoperability with Java, Kotlin enables developers to write more concise, expressive, and reliable code. It’s now widely used to build high-performance mobile apps and backend systems, making it a top choice for teams looking to streamline development without compromising quality.

Our native apps have been featured in

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Examples Of Our
Development Projects

Toronto Waste Wizard

Stylist

The Stylist app was designed to help users easily discover nearby beauty and grooming businesses, book appointments, and stay connected through a built-in social feed. Users can browse services, post their own content, and engage with others — all within a single, seamless mobile experience.

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No Closet

No Closet is an app developed with the possibility to help people make money with their closets. Users can sell and rent any item they have on the platform and create a line of customers.

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Aardvark

Aardvark is a book club where users can subscribe and received 3 books of their pick every month. The community in the application can discuss around the books and discover new authors to read.  

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Companies we
work with

Guarana is one of the biggest mobile application maker in Canada. We have worked with hundreds of companies to design and develop the apps.

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Découvrez ce que disent nos clients

Jeremy Gordon

Co-founder @ KINETICOACH Travel Trainer

We were blown away by the responsiveness of their developers and their uncanny ability to conceptualize exactly what we were looking for in our app. From graphics to interface, they exceeded all expectations and delivered an incredible solution.

Trisha Stone

CEO @ IntheMood

Guarana managed all of the technical elements of the design/build of my mobile application, In the Mood. They're creative, they care, and they build great products. I have come to rely on them to not only build an amazing product but to also offer strategic advice on design and growth.

Lionel Coelho

Tech Project Manager @ City of Toronto

The app was looking sharp and functioning as intended.

Khaled Khalifa

Director @ Nurse on Call

They care about the product and their clients and they see the long-term potential of your business. They're responsive and approach the engagement with a long-term perspective.

Méléhi Diane Yo

Founder @ BC Paris

Thank you for your services Guarana Technologies. You were able to understand my desires and I am completely satisfied. Additionally, you provided comprehensive mentoring and guidance throughout the development process. I highly recommend, you support entrepreneurs. Innovative is the word that best describes you. I highly recommend.

Chris

CEO @ GoBeMap

Guarana did a fantastic job developing an iOS mobile app for me. GoBeMap is makes it much easier for people who lead a healthy, active lifestyle to find the places that support them. I'm not a tech guy, and Guarana was very patient and produced a great product - no crashes reported. I'll continue to work with them, and already recommended them to a friend for his established business.

Frequently Asked Questions About KMP App Development

Got questions? We've got answers! your top FAQs about KMP app development, answered.

Why use KMP over React Native?

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Kotlin Multiplatform lets you share business logic and core code across Android and iOS without sacrificing native UI performance. Unlike React Native, which abstracts the UI layer, KMP keeps native views native — meaning smoother performance, better device integration, and fewer UI compromises.

Why use KMP over Flutter?

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Flutter uses a custom rendering engine and its own UI components, which can lead to heavier apps and design constraints. KMP, on the other hand, allows full native UI control with shared backend logic — ideal when you want to reuse code but still deliver platform-specific design and responsiveness.

Are iOS app developers needed when using KMP?

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Yes — KMP shares the logic layer, but the UI for iOS is still built in Swift or SwiftUI. You’ll still need iOS developers to implement and maintain the interface, but they can work with shared logic from the Kotlin layer, reducing effort and avoiding duplication.

What are the time savings of KMP app development?

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Time savings can range from 30% to 50% depending on the complexity of the business logic. With shared code for networking, data models, analytics, and more, your team can develop features once instead of duplicating the work across platforms.

Is KMP production ready?

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Yes, KMP is used in production by major companies like Netflix, Philips, and Cash App. JetBrains, the creator of Kotlin, uses it extensively and continues to invest heavily in its future. It’s stable, actively maintained, and ready for production use.

Can Kotlin UI layer be brought to iOS Swift?

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Not yet. KMP doesn’t handle the UI layer on iOS — the shared Kotlin code is used for logic only. UI needs to be written in Swift or SwiftUI. However, Jetpack Compose for iOS is in experimental stages, which may change this in the near future.

How long does mobile app development take?

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Timelines vary by scope, but for a standard MVP, expect 3 to 5 months. With KMP, this can be accelerated by avoiding double development for shared features, especially when your backend and business rules are complex.

How much does KMP save on development cost?

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Depending on the project, KMP can reduce development costs by 30–40%, mainly by eliminating duplicate effort across iOS and Android teams. The more complex the logic layer, the more valuable KMP becomes in terms of ROI.