Building a Web App Using Flutter in 2023: A Complete Guide

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  • By Surya Sharma
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  • clock 12 minutes MIN READ
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  • calendar Updated: January 16, 2023

Have you heard of the newly developed Flutter framework? It is undoubtedly one of the most popular app development frameworks available right now.

Since December 2018, when Google released its first stable version of the Flutter web app, it has become the talk of the town.

Since then, it has been used to develop amazing apps with no bugs. The intriguing features and properties of the Flutter web app have inspired designers to experiment with building complex apps.

[Do you know | Alibaba and BMW use Flutter for Mobile App Development]

Developers of the Flutter web apps initially concentrated only on making cross-platform mobile apps for Android and iOS.

Google-created open-source web framework that has completely revolutionized the internet. The responsiveness of the Flutter framework is just one of its many advantages.

It is also platform-independent and quite simple to implement.

In this blog, we’ll go in-depth on how to use the Flutter web to build a responsive web app. We’ll demonstrate how Flutter build web app that can adapt to screen size and layout changes as required.

Flutter – A Brief Overview

An innovative framework for creating stunning cross-platform mobile applications is called Flutter Web development.

Flutter web app enables programmers to use a single code base to target the iOS and Android platforms. Its popularity is expected to grow even more after the release of Flutter 2.

The Flutter web development industry will be affected by the Flutter framework.

Although the Flutter web app is a flexible medium in and of itself, Flutter for  Web is the best choice for creating Flutter for web applications like PWAs or SPAs as well as porting your current mobile app to the web.

Progressive Web Apps

A PWA is a website that functions and appears like a mobile application.

flutter PWA is designed to make use of the built-in capabilities of mobile devices without requiring the end user to go to an app store.

Also, Read | Native Apps or PWA which Suit your Business

Single Page Application

A single-page application is referred to as a SPA.

Flutter for web applications uses dynamic loading to load material without refreshing the page.

For instance, you don’t have to wait long to see an annoying page loading screen when you check your Facebook feed.

As soon as you scroll through your feed or switch between tabs, the content loads immediately.

Flutter web app is a brand-new cross-platform framework revolution for savvy companies and developers everywhere.

It never ceases to amaze us with the possibilities while greatly simplifying and expediting the creation of IT goods.

Flutter web app enables up to 60% of cost savings when it comes to cross-platform development.

How Does Flutter Help Businesses?

1. Close to Native

The first argument that Flutter Web is the ideal choice for web development is that it has a look and behavior that is comparable to those of native applications.

It holds true even if you have to create a flutter for a web application with challenging graphic effects.

Flutter for Web makes use of dart2js, which is a transfer from Dart to JS. The rendering techniques used by Flutter for Android and iOS are the same as those used by the web’s graphics engine.

As a consequence, the user won’t notice a difference between our website and a native one.

Additionally, Flutter enables simple platform definition and UI implementation based on the unique requirements of the design client.

2. Easy Code Maintenance

Dart is a simple language to pick up, especially for programmers who already write in Java, C#, or JavaScript.

It takes experienced programmers approximately 2 weeks to learn it and get started with Flutter web apps, while it takes fresh specialists about 3–4 weeks.

In addition, it usually just takes a few days to grasp Dart’s syntax. The flutter web development process and onboarding are made simple and quick thanks to the programming language.

Code maintenance gets easier as the language gets simpler.

New team members can quickly become acclimated to the workflow, and after that, they can develop code, correct it, and conduct tests independently of additional assistance from other team members.

3. Great Architectural Solutions

The framework’s straightforward, contemporary architecture gives enterprises a chance to quickly deploy their MVP.

It’s a fantastic option if you need to show investors, business stakeholders, or in more situations, your Flutter web app.

Check out our dedicated post for additional information on Flutter, how it differs from other frameworks, and how much it costs to create a Flutter online or mobile application.

4. Toolset for Web Development

The toolkit that Flutter provides is beneficial and effective.

After selecting Flutter, you’ll be pleasantly amazed by how simple the procedure is and how many new features are added with each new release.

The picture decoding feature is one of the key components. In browsers that support it, the Flutter web app has started to automatically recognize and use the ImageDecoder API.

The majority of Chromium-based browsers, including Chrome, Edge, Opera, Samsung Browser, and others, now provide this API.

The new API uses the built-in image codecs of the browser to asynchronously decode images from the mainstream, making the process two times faster and preventing the main thread from being stuck.

When loading photos, it helps to prevent latency.

The Flutter web app Lifecycle API is the second noteworthy feature. It will provide you additional control over a web app’s initial Flutter server-side HTML page load.

The functionality also makes it simpler to evaluate your Flutter web app performance in Lighthouse.

5. PWA Out-of-The-Box

If you already have an existing codebase for Android and iOS, Flutter gives you the option to create web apps and progressive web apps.

It won’t be necessary to hire new coders with new skills for this. Flutter PWA is a cost-effective way for your company to open a new channel of distribution.

Out-of-the-box Because Flutter uses the same graphical engine for Android, iOS, and the web, your PWA will, after compilation, behave exactly as you would expect it to on both those platforms and the web.

The Flutter web app will appear native on all platforms and works with any device with ease.

Due to the compatibility of Dart and JS, you can technically connect with the “native” code. Additionally, WASM can be added to the code.

You can read more about the potential benefits of the potent Flutter PWA combination in our dedicated post.

6. Welcoming and Active Community

Flutter is the most popular cross-platform framework, according to Statista.

And the community attracts enthusiasts from all over the world who work together to build the framework, produce new open-source tools, plan and host events with 60k specialists present, and actively participate in these activities.

RV Tech is not an outlier. Our developers use Flutter for web and mobile products for a variety of markets, including the financial, food-tech, and entertainment domains.

We have a strong Flutter team that takes part in world-famous projects.

Some Other Benefits

Flutter might be the best option for Flutter web development. It definitely has benefits for organizations; therefore, using Flutter for Web will be profitable.

1. Web and Mobile App Development Both at the Same Time

Flutter is unquestionably the way to go if you need to have your web and mobile apps ready at the same time.

With the help of Flutter developers, it is possible to construct the entire product from the code base up.

Flutter seems like a solid solution even if you are not in a rush because it allows for the simultaneous delivery of two different types of apps, which saves a tonne of time.

This trick is known to savvy businesspeople. You ought to emulate their actions.

A key consideration during development must be how a user will interact with the software.

However, developers must prioritize UI aspects when it comes to app design. Additionally, the appearance of online and mobile apps differs; Flutter developers must work on various screen sizes and resolutions to achieve the proper size.

In conclusion, choosing Flutter saves time and produces top-notch results.

2. Usage of Code


Writing code takes a long time, which might occasionally delay the launch of an application.

In the event that you already have an app developed or in progress for the web, this issue is rarely encountered with Flutter or React app development.

You may then quickly reuse existing UI (User Interface) elements in this situation.

3. Companionship

The previous code can also be utilized with Flutter, as we previously mentioned. This aspect of Flutter certainly works like a charm.

Flutter Web app fulfills the function of being a dependable ally for mobile applications.

For instance, a demo mobile application can use the same standard code created with the aid of a larger Flutter-based system.

How To Build a Web App Using Flutter?

The ideal time to develop the Flutter web app has arrived. We now understand the significance of using Flutter to create a responsive web application.

But where should one begin, and how should one proceed? You need not fear, though, because we have you covered.

We’ll review the components that make a Flutter web application responsive in the sections below.

1. Use MediaQuery for the Layout

MediaQuery, a crucial component of the Flutter framework, can be used to choose the application’s layout.

When it comes to maximizing the layout modifications, this option is quite helpful. Based on the two sorts of layouts—landscape and portrait—you can make it responsive.

2. Using widgets – LayoutBuilder and Orientation Builder

To fine-tune the layout changes, you can utilize LayoutBuilder and OrientationBuilder instead of the conventional MediaQuery.

Various widgets may not perform properly if they are not optimized.

You may overcome the widget issue and run programs on diverse layouts and screen sizes by utilizing the aforementioned two solutions.

3. The FittedBox

The widget Flutter For text to automatically resize based on the size of the parent widget, FittedBox is a crucial component.

Users may find it challenging to arbitrarily raise the font size because it may extend outside of the box.

Scaling of the FittedBox widget is possible based on the size of the parent widget.

4. Fix the Broken Gallery

If the aspect ratio is not taken into consideration, layout and screen orientation issues may arise.

What is this aspect ratio, exactly?

The ratio between the box’s height and breadth is known as the aspect ratio.

The widget can freely resize itself in accordance with the screen orientation if the AspectRatio widget option is used.

In both landscape and portrait modes, it will be different.

5. The Custom Multi Child Layout Widget

The CustomMultiChildLayout widget introduced by Flutter gives layout widgets the ability to self-organize based on the type of layouts.

This widget’s purpose is to enable the user to arrange the kids that will be supplied to it in a single function. The sizes and positions may be interdependent.

6. Declarative UI


Imperative UI programming is typically used by frameworks from Android to iOS. The most popular UI programming method allows developers to manually create a fully functional UI component.

Developers have a lot of work to do with standard UI development; thus, Flutter has created Declarative UI to help.

This allows the framework to handle all transitions while allowing the developers to declare the current UI state.

What to Consider While Using Flutter for the Web?

Here are the key points to remember while using Flutter Web App:

1. Single-page applications are created with Flutter Web App

2. The native code for websites can be modified in the same manner that iOS and Android apps are modified.

3. Making your Flutter web app responsive will be beneficial so that users can access your website on any screen size.

4. Run the Flutter build web command to publish your Flutter web app, and you’ll discover an index.html file in the web folder in the project directory.

Although many programs support the web, before you start coding, make sure to look into the supported platforms.


Below-mentioned are some frequently asked questions about Flutter for web app development. Let’s take a look at them right away!

Q1. What is Flutter for the Web?

A. Flutter for the Web is an open-source, code-compatible UI software development kit that creates the user interface using HTML, CSS, and JavaScript.

Q2. Is Flutter effective for building websites?

A. Yes. Due to its high compatibility with current-generation webs rendering technologies like HTML, CSS, and JavaScript, Flutter is excellent for developing both mobile and web apps.

With Flutter, you can quickly embed the current code in the browser, compile it into a client experience, and then deploy it to any web server.

Q3. Which web browsers are supported by Flutter?

A. Nearly all current browsers, including Chrome, Safari, Edge, and Firefox, support Flutter web apps.

For debugging your app while it is still in development, Chrome (on Windows, macOS, and Linux) and Edge (on Windows) are supported as the default browsers.

Wrapping Up

Flutter has demonstrated to bring more business value with its continued popularity and growing adoption of business apps.

You now have more justifications for choosing Flutter Web development if you have read this tutorial.

Both web and app developers will find Flutter Web useful. As a result, we are not required to learn HTML, CSS, or JS.

With its rising recognition and popularity, Flutter has unquestionably developed into a useful tool for businesses.

Are you looking for a robust solution to kickstart your Flutter app development? Park your worries because we at RV Technologies have got you covered.

With an effective technology stack, our seasoned technical developers provide top-notch web app development services to help you stay ahead of the curve.

Connect with our experts and take your first step toward building a successful web application.

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