A few years ago, a business that wanted an app on both iPhone and Android usually paid for two: one built in Swift for iOS, one in Kotlin for Android, with two teams keeping them in step. Cross-platform app development changes that. With frameworks such as Flutter and React Native, one team builds one codebase that ships to both stores — and, increasingly, to the web and desktop too. This guide explains how the main options work, how to choose between them, what an app costs in Toronto, and when building natively is still the better call.
What Is Cross-Platform App Development?
Cross-platform app development means writing most of an app once and running it on several operating systems. The frameworks differ in how they do it — whether they use each platform’s own interface components or draw their own — and that difference shapes performance, look and feel, and which developers can work on the app.
It sits between two alternatives. Native development builds a separate app for each platform with Apple’s and Google’s own tools: the best possible platform fit, at roughly twice the build and maintenance effort. Progressive web apps run in the browser and can be installed to the home screen: the cheapest route, but with limited access to device features and no App Store presence on iOS. Our guide to progressive web apps vs native apps covers that choice.
The Main Cross-Platform Frameworks in 2026
React Native
Created by Meta, React Native lets developers write apps in JavaScript or TypeScript with React, and renders each platform’s real native interface components. Its newer architecture, now the default, has removed much of the old performance overhead between JavaScript and native code, and tools such as Expo make building, updating and releasing apps much simpler.
- Language: JavaScript / TypeScript (React)
- Interface: the platform’s own native components — the app feels at home on each OS
- Strengths: the largest talent pool; code and skills shared with React websites; over-the-air updates for JavaScript changes
- Used by: Meta, Microsoft and Shopify, among many others
Flutter
Google’s Flutter takes a different approach: instead of using the platform’s components, it draws every pixel of the interface itself with its own rendering engine. That gives designers complete control — the app looks identical on every device — and smooth, complex animation. The same codebase can also target the web and desktop.
- Language: Dart
- Interface: drawn by Flutter — pixel-identical across platforms
- Strengths: highly custom, branded interfaces; animation; one codebase for mobile, web and desktop
- Used by: Google (including Google Pay), BMW and Alibaba, among others
Kotlin Multiplatform
Kotlin Multiplatform shares an app’s business logic — data, networking, rules — in Kotlin across Android and iOS, while the interface can stay fully native or be shared with Compose Multiplatform. It is a strong fit for companies that already have native apps, or Android expertise, and want to stop writing the same logic twice without a full rewrite.
.NET MAUI
Microsoft’s .NET MAUI is the successor to Xamarin (whose support ended in 2024). Apps are written in C# and render native controls. It makes most sense for organisations already invested in .NET, Azure and C# — typically internal and enterprise apps.
Flutter vs React Native: How to Choose
For most Toronto businesses the decision comes down to Flutter vs React Native, and both are excellent. A few questions usually settle it:
- Who will maintain the app? If your developers — in-house or agency — work in JavaScript and React, React Native lets them build the app with skills they already have, and share code with your website.
- How custom is the design? If the interface is highly branded, animated or unconventional, Flutter’s own renderer makes it easier to get exactly right on every device.
- Should it feel like the platform? If users expect standard iOS and Android behaviour and controls, React Native’s native components give you that by default.
- Where else must it run? Flutter targets mobile, web and desktop from one codebase; React Native shares well with a React website.
- Do you already have native apps? Then Kotlin Multiplatform can share logic between them without a rewrite.
What Does a Cross-Platform App Cost in Toronto?
For a typical business app with standard features — user accounts, a product or service catalogue, a cart or booking flow, push notifications — our ranges look like this:
| Approach | Typical cost | Typical timeline |
|---|---|---|
| Native iOS + Android (two codebases) | $80,000 – $150,000 | 5–8 months |
| React Native | $40,000 – $75,000 | 3–5 months |
| Flutter | $35,000 – $70,000 | 3–5 months |
| .NET MAUI | $40,000 – $80,000 | 3–6 months |
What moves the number most is scope, not the framework: integrations with your existing systems, offline use, payments, admin tools, and how custom the design is. Experienced cross-platform developers in the GTA typically charge $75–$150 an hour.
The savings continue after launch. Maintaining two native apps typically runs $4,000–$8,000 a month; a single cross-platform codebase, $2,000–$4,000 — because every fix, feature and design change is made once instead of twice.
When Native Is Still the Better Choice
Cross-platform is the right default for most business apps, but not all. Build natively when:
- The app’s core depends on advanced platform features — augmented reality, sophisticated camera processing, specialised sensors, or deep OS integration such as widgets and watch apps at its centre.
- You are building a graphics-heavy game or real-time processing where every millisecond counts.
- You only need one platform, now and for the foreseeable future.
- You already have strong native teams and established native apps — in which case Kotlin Multiplatform may give you the sharing benefits without a rewrite.
Building Apps for Canadian Users
- Accessibility. Support screen readers (VoiceOver and TalkBack), dynamic text sizes, sufficient contrast and large touch targets from the start. WCAG’s principles apply to apps, and accessibility obligations — and customer expectations — apply whatever the platform.
- French. If you sell to customers in Quebec, Quebec’s Charter of the French Language (strengthened by Bill 96) requires French; federal institutions have their own official-languages requirements. Plan for localisation in the architecture even if you launch in English.
- Privacy. Canada’s private-sector privacy law (PIPEDA) applies to the personal information an app collects, and both app stores require clear privacy disclosures.
- Patchy connections. Underground walkways, transit, elevators and parking garages still drop the signal. Design the app to keep working offline and to recover gracefully.
After Launch: Keeping an App Healthy
An app is never finished. Apple and Google release new operating systems every year, and both stores require apps to keep up with recent SDKs to stay listed and receive updates. Budget for regular framework and dependency updates, store compliance, monitoring and crash reporting, and steady improvements based on how people actually use the app. A single cross-platform codebase makes all of this cheaper and faster.
Frequently Asked Questions
Is a cross-platform app as good as a native one?
For most business apps, yes. Well-built React Native and Flutter apps are fast and smooth, and most users can’t tell them apart from native apps. The gap only matters for apps at the edges — heavy graphics, advanced hardware use or deep OS integration.
Which is better, Flutter or React Native?
Neither is better in general. React Native suits teams with JavaScript and React skills and apps that should feel native on each platform; Flutter suits highly custom designs and projects that also target web and desktop. Both are mature, well supported and used in large production apps.
Can I start cross-platform and go native later?
You can, but it is effectively a rewrite of the interface. A better plan is to choose an architecture that leaves room for native code where you need it — React Native and Flutter both let you write platform-specific modules for particular features.
How long does it take to build a cross-platform app?
A focused first version usually takes three to five months, including design, development, testing and store review. Starting with a smaller first release and adding features based on real use is often the fastest route to value.
Related Resources
- Progressive Web Apps vs Native Apps
- Mobile App Development Toronto: 2026 Guide
- App Design + Development
- API
Planning an app? PerfectPixels designs and builds cross-platform apps — and will tell you honestly when native or a progressive web app is the better choice. Contact us to talk about your project.
Further reading: Flutter documentation — Google.