Leverage the power of Flutter for your embedded application
Flutter enables license-free, high-performance embedded HMIs with faster development cycles, lower total cost of ownership, and consistent user experience across embedded devices, industrial PCs, and mobile companion apps.
Why Flutter?
Flutter Instead of Qt for Embedded HMIs
Flutter has emerged as a modern alternative for developing embedded human–machine interfaces (HMIs), companion mobile apps, and cross-platform user interfaces. While Qt remains a powerful and widely used framework, Flutter addresses many of the challenges that modern embedded products face today — especially when it comes to development speed, maintainability, and cross-platform consistency.
This page explains why Flutter is particularly well suited for embedded HMIs and companion apps, and what practical benefits this brings for embedded product development.
Faster HMI Development with Flutter
One of Flutter’s most significant advantages is development speed.
Flutter’s hot reload mechanism allows developers to see UI changes almost instantly — without restarting the application or redeploying it to the target device. This dramatically accelerates:
- UI and UX prototyping
- Iterative design refinement
- Tight feedback loops between developers, designers, and product owners
Compared to traditional embedded UI frameworks, where build–deploy cycles can take minutes, Flutter enables a development workflow that feels closer to modern web and mobile development — even on embedded targets.
Result: Faster iterations, quicker validation of ideas, and significantly reduced development time for embedded HMIs.
Easier to Learn and More Productive Than Qt
Qt-based HMI development typically involves multiple programming paradigms and languages:
- C++ for application logic
- QML and JavaScript for UI definition and animations
While powerful, this mix can quickly become complex. Many errors — especially in QML/JavaScript — are only detected at runtime, which makes debugging harder and increases development risk.
Flutter, in contrast, uses a single, strongly typed language (Dart) for UI, logic, and animations.
Benefits include:
- A consistent programming model across the entire UI stack
- Compile-time error detection for many common issues
- Less context switching between languages and paradigms
For teams new to UI development — even teams with strong embedded C/C++ backgrounds — Flutter is often easier to learn and easier to reason about than a multi-language UI framework like Qt.
Fewer Errors Through a Managed Runtime
Flutter applications run in a managed runtime environment with automatic memory management and a garbage collector.
This eliminates entire classes of bugs that are common in C++-based UI development, such as:
- Memory leaks
- Use-after-free errors
- Incorrect smart pointer lifetimes
- Hard-to-reproduce crashes
Developers do not need to reason about ownership models or smart pointer semantics when implementing UI logic, state handling, or animations.
Result: More robust HMIs, fewer runtime issues, and reduced long-term maintenance effort — especially for complex user interfaces.
Clear Stack Traces and Better Debugging
When errors occur during development, Flutter provides clear, readable stack traces that directly point to the relevant source code locations.
Especially sporadic crashes of Qt programs or errors in the QML / JavaScript code are often hard to debug. Flutter’s error reporting makes it easier to:
- Understand what went wrong
- Identify faulty UI logic or state transitions
- Fix issues quickly during development
This improves developer efficiency and reduces debugging time significantly.
Strong Cross-Platform Support from a Single Codebase
Flutter was designed from the ground up for cross-platform UI development.
The same codebase can run on:
- Embedded Linux systems
- Industrial PCs (Windows or Linux)
- Smartphones and tablets (iOS and Android)
- Desktop systems
- Web browsers
For embedded products, this has major advantages:
- Early UI prototypes can run on standard tablets or in a web browser
- Companion mobile apps can be developed alongside embedded HMIs
- UI and interaction concepts can be validated long before final hardware is available
Result: Faster time to market and lower project risk through early testing and validation.
Ideal for Companion Apps and Connected Devices
Modern embedded products rarely exist in isolation. They increasingly rely on:
- Mobile companion apps
- Remote diagnostics and configuration
- Connectivity via BLE, WiFi, or Ethernet
- Cloud services and backend systems
Flutter excels in these scenarios because it supports mobile devices as well as embedded and desktop platforms.
This makes Flutter an excellent choice for products that require:
- A consistent HMI on the device itself
- A companion mobile app with shared UI and logic
- Seamless communication between embedded firmware and apps
No Licensing Fees and Lower Total Cost of Ownership
Unlike many traditional embedded UI frameworks, Flutter is open source and free to use, without runtime fees, per-seat licenses, or royalties.
In contrast, commercial Qt-based HMI projects involve:
- Commercial Qt licenses for development and deployment
- Per-developer or per-device licensing models
- Ongoing costs for long-term maintenance and updates
For embedded products with long lifecycles, large production volumes, or multiple variants, these licensing costs can become significant over time.
By using Flutter, companies benefit from:
- No framework licensing fees
- Predictable long-term costs
- Freedom from vendor-specific runtime restrictions
Result: Lower total cost of ownership (TCO) and fewer financial risks over the full product lifecycle.
Business Impact: Faster Time-to-Market and Lower Costs
The technical advantages of Flutter translate directly into measurable business benefits:
- Faster development through hot reload and rapid iteration
- Earlier validation through prototypes running on tablets, desktops, or web browsers
- Reduced development costs through extensive code reuse across platforms
- No licensing fees compared to traditional embedded UI frameworks
- Lower maintenance effort thanks to a managed runtime and modern tooling
- Easier team scaling due to shorter onboarding time
By reducing duplicated effort, licensing costs, and long-term maintenance overhead, Flutter enables embedded teams to focus more on product differentiation and core functionality — rather than UI infrastructure.
Performance and Animations on Embedded Linux
A common concern when choosing a UI framework for embedded Linux is runtime performance — especially on systems with limited GPU or CPU resources. Flutter has proven to be extremely well suited for this environment.
Flutter applications are compiled ahead of time (AOT) to native machine code and use a highly optimized rendering pipeline designed for smooth, frame-consistent graphics. Animations, transitions, and UI updates are executed within a unified framework that tightly integrates application logic, layout, and rendering. This allows Flutter to deliver fluid animations and predictable performance even on embedded hardware.
In contrast, Qt splits responsibilities between C++ application logic, declarative UI layers, and script-based animation logic. While powerful, this separation can introduce runtime overhead and makes performance tuning more complex — particularly for animation-heavy, touch-driven interfaces.
As a result, Flutter-based embedded HMIs frequently achieve equal or better runtime efficiency than Qt while being significantly easier to develop, maintain, and optimize.
This makes Flutter a strong choice for embedded HMIs on Linux-based SBCs and industrial PCs, including performance-critical systems where smooth animations and modern user interaction are key requirements.
Flutter vs Qt
Both Flutter and Qt can be successfully used for embedded HMIs. However, their strengths differ significantly depending on UI complexity, animation requirements, long-term maintenance goals, and cross-platform strategies.
Aspect
Flutter
Qt
Primary design focus
Modern, reactive user interfaces with consistent behavior across platforms
Traditional desktop and embedded applications with a long history in industrial systems
Programming model
Single, cohesive programming model using Dart for UI, logic, and animations
Mixed model using C++, declarative UI (QML), and JavaScript for animations and behavior
Learning curve
Easier to learn and reason about due to one language and a consistent framework
Steeper learning curve due to multiple languages and paradigms
Error detection & debugging
Strong compile-time checks, managed memory, and clear, readable stack traces
Many UI and animation errors surface only at runtime and can be harder to trace
Memory management & safety
Managed language with garbage collection; no manual memory management or smart pointers required
Manual memory management in C++ increases complexity and risk of subtle bugs
Development speed
Very fast iteration cycles enabled by hot reload and rapid UI experimentation
Slower iteration cycles due to longer build times and limited live-update capabilities
Cross-platform support
One codebase for embedded Linux, Windows IPCs, mobile apps, and web
Mostly common codebase for desktop and embedded Linux, poor support for mobile app, no support for web
Prototyping & early validation
Prototypes can run early on desktop systems, tablets, or in a browser before target hardware is available
Prototyping is usually tied closely to the target hardware platform
Runtime performance (simple UIs)
Slightly higher baseline overhead for very simple, mostly static HMIs
Can be more resource-efficient for simple HMIs without animations or complex interactions
Runtime performance (modern HMIs)
Optimized rendering pipeline excels at smooth animations and fluent user interaction
Achieving equally smooth animations often requires careful tuning and added complexity
Animation model
Animations are first-class citizens, tightly integrated into the rendering pipeline
Animations are typically layered on top of the UI logic, increasing complexity
Visual consistency
Pixel-perfect, identical look and behavior across platforms and for different screen sizes
Visual appearance can vary depending on platform, style, and configuration – support for different screen sizes increases complexity
Licensing & long-term costs
Open-source with no runtime or commercial licensing fees
Proprietary products require commercial licensing
Long-term maintainability
Unified architecture simplifies refactoring and long product lifecycles
Mixed-language architecture increases long-term maintenance effort
Qt remains a solid choice for extremely resource-constrained hardware targets that allow only simple, static embedded HMIs with minimal or no animation. However, as embedded products increasingly require modern, fluent user interaction, rich animations, and seamless reuse across embedded devices, industrial PCs, and mobile companion apps, Flutter offers decisive advantages. Its unified programming model, high development speed, predictable behavior, and zero licensing costs enable faster time-to-market, lower long-term maintenance effort, and a consistent user experience across platforms. For modern embedded HMIs on Linux-based SBCs and industrial PCs, Flutter is therefore not just a viable alternative to Qt — it is often the more future-proof choice.
Leverage the power of Flutter for your embedded application