Why Should You Develop a Mobile App on Flutter in 2021?

Volodymyr Hodiak
Volodymyr Hodiak
626 April, 13, 2021 10 min read
626 April, 13, 2021 10 min read

In order to reduce the costs, accelerate release date, and strengthen online presence different businesses develop their applications. One of the fastest ways to develop an app is to use Flutter. It is due to the possibility to create cross-platform applications. 

Cross-platform apps are the best decision for any business since native apps for iOS and Android are significantly more expensive to develop and maintain. We have more than 5 years of experience in mobile development, and we insist on the fact that Flutter is one of the best instruments we have worked with.

Different Cross-Platform Frameworks 

In plain English, a cross-platform framework is a set of instruments that allows the creation of an application that can be run both on iOS and Android. However, each framework has its own capabilities and limitations. React Native, Xamarin, PhoneGap, Titanium, Ionic, and Flutter are the most popular ones. The perfect framework for cross-platform development has to satisfy two basic requirements: economy and decent user experience.


Besides the fact that you make one application when two is required is fascinating, but that is not everything you get while working with Flutter. Usually, there are a lot of problems associated with the adaptation of an app to a particular platform, but they do not concern simple applications. However, if you want to create a complicated app, and you will inevitably reach this stage of software development, you will face the problems with which Flutter is particularly good.

In fact, Flutter is not only about mobile development. This framework can also be used in Web and Desktop development. Together with Android, iOS, and web, which are supported by Flutter, it also gives you the possibility to develop for Windows, macOS, and Linux in beta.


One of the most important features of cross-platform applications is the possibility to make them look native so that users perceive it as if it was written specifically for that platform. It is often problematic for a framework to provide the user with smooth animations, particular OS UI elements, and work with gestures, but this problem does not concern Flutter. 

Smooth animations are the advantage of Flutter. With it,  you can use familiar and user-friendly native elements without any problems while the apps created with other frameworks may still look like a more advanced mobile version of a website wrapped in an app. Neglecting UX makes your app useless because you will lose your customers, and as a result, this will lower the ratings in the stores and retention.

Flutter is Google's fresh take on cross-platform development. Despite the obvious economic benefits, even for large-scale tasks, the technology is relatively new, and that is why many developers are in no hurry to use it.

However, we chose Flutter for its convenient toolkit, ease of creating animations, and UI components performance, which is close to native applications. The technology itself seems to be specifically designed to work out micro-interactions that create a sense of comfort and allow the developers to provide thoughtful UX. 

Native vs Cross-Platform

Native applications are the ones that are specifically written for a certain OS, such as Swift for IOS or Kotlin for Android. Both of them do not have serious drawbacks, but they require significant development and support costs. You will have to take into account the peculiarities of each platform while creating business logic, layout, and interface. All of these will affect the project budget.

A cross-platform application written with Flutter has the advantages of native development as well as allows you to reuse most of the code between different platforms. Such an approach may save you up to 40% of the budget. 

Besides writing one code instead of two, Flutter provides a possibility to use off-the-shelf features. Moreover, the optimized process of working with animations is one of the best among other frameworks. Furthermore, the function hot reload allows developers to assemble an application from widgets in seconds instead of waiting for it to compile. All of these functions seriously economize your time, which can be used for the implementation of the other necessary features of your product.

React Native

We also had the experience of work with React Native. After the completion of a few projects, we noticed that React Native has a low entering threshold. In particular, a developer who knows React will be able to code in React Native in two weeks.

However, there are two critical drawbacks in the work of this framework. First of all, the UI code is compiled into native platform code, which means that a button may look different on different platforms. Therefore, you will have to spend time in order to make the UI look identical on all the platforms you are working with. There was even a moment when we had to increase the development time by 30% due to the IE6 adaptation.

Another drawback is the migrations of the React Native versions. Each update means that you have to fix component bugs, which leads to the package forks. In most cases, when you update the platform core, you need to fix app components and the installed third-party packages.  

Advantages of Flutter

When choosing a framework you should look at many factors starting from the resources available to the specifics of a particular application. According to Google, there are three main advantages of Flutter:

Development Speed

  • The development time on Flutter is 20-50% faster than the development of two native apps. The speed depends on the complexity of the interface and the required functions.
  • It is also important to highlight that this speed is possible only in case a developer knows how to solve the task he has to do.
  • Besides, this speed works not only during the development process but also during updates deployment.
  • The presence of autotests, as well as UI and business-logic coverage, reduces the chances of something going wrong while working in Flutter. For instance, if you test an iOS app and find a bug, you can fix it, and it will not appear on the Android version. However, if you adhere to native development, you will have two different lists of bugs, and it will take more time to fix them all.
  • Sound null safety is an addition to the Dart language that further improves the type system. It separates the types that accept a Null value from the ones that do not accept. In such a way, sound null safety prevents crushes, which are frequent due to the problems with Null value.

Expressive and Flexible UI

  • Flutter allows you to implement a native "look and feel", but you will have to create the UI elements manually. The framework will customize the fonts, physics of scrolls, navigation gestures, etc.
  • Flutter is a perfect tool for a unified UI/UX. You can create apps with animations familiar to a user so that your apps will look native. The end-user will not spot the difference if all the widgets are configured correctly.
  • In fact, Apple users can find slight differences in UI. In particular, they concern animations and dynamics.

Native Performance.

  • Most modern applications do not require complex logic. Requests to the server, working with files, and platform API files - all of these are done asynchronously in Flutter, which does not slow down the performance.
  • Flutter has its own graphics engine that is optimized to keep up with native. Images change at a speed of up to 60 frames per second, which is perceived smoothly by the human eye.
  • However, it is almost impossible to create an app on Flutter, which would work perfectly on any device of any year of release, right away. For this purpose, you will need tests and fixes like with any native framework.

Why is Flutter development cheaper?

Let us consider an example of developing a catalog project. For example, a catalog of cars with the ability to search, add to favorites, save searches, create a user profile, apply filters, etc. Here is how the development team would look like:Flutter team vs Native team

Taking into consideration the number of people you will need for each of the projects, let us apply the time you will need to complete the development. Here is where native and cross-platform development differs the most.

Time for Flutter development vs Native Development

As you can see from the table above, Flutter may help you save a lot of budget. The average percentage of economized finances is 60% on development, 70,5% on QA in case of the use of autotests, and 33,3% on design.

Indeed, there are different projects and the economy may vary depending on them. Moreover, there is a potential calendar design advantage since you do not need to synchronize logic across platforms.

Flutter is a good choice in cases where there is no close integration with the device’s hardware. In 95% of cases, Flutter covers most project needs. If something is missing, Flutter provides an interface to work with the native platform. We tell everything about the advantages and disadvantages of cross-platform solutions before signing the contract. Therefore, be not afraid if you have any questions or if something seems unclear: we will have a talk about that once again.

What about Use Cases?

In short, you can use Flutter for anything. Flutter is used by a lot of companies from Alibaba to SpaceX. However, it is necessary to mention that this framework works best with medium and large businesses. The thing is that a mobile app is not the best decision for a small business due to its significant cost. Instead, the owners of a small business should try using out-of-the-box decisions, which will be much cheaper.

You can use Flutter for:

  • various retail (loyalty programs, catalog, or an online store);
  • banks and fintech (work with small businesses);
  • suppliers and franchisees;
  • large business (contact centers, courier control, or organization of internal processes).

Q and A

Here is the shortlist of frequently asked questions. By the way, you can drop us a line if you have a question that is not listed here:

Why Flutter? 

The apps built with Flutter are quicker and more stable than the apps made with other frameworks. They work with 60 fps, which allows to make animations smoother and launch applications even on older smartphones. The look and UX of Flutter applications make them indistinguishable from native ones for the user.

How Flutter reduces the development time?

The cross-platform framework allows you to reuse most of the code between different platforms, while the business logic, layout, and application interface remain almost unchanged. Because of this, cross-platform apps are more profitable than native apps. Flutter's technical features allow you to develop applications with even greater speed.

Is Flutter safe?

Yes. There is no difference between the native development, when the issue of safety is concerned since the native technologies of the platform are used in Flutter. In particular, Touch ID, Face ID, or fingerprint scanner can be used. Furthermore, the application code is encrypted in such a way that it cannot be recovered by reverse engineering.

Why is everyone not using it?

Flutter is becoming more and more popular. According to Stack Overflow data for 2019, 75% of respondents named it their favorite framework. However, native frameworks are still useful instruments, and they still will be used at least for a decade.


Flutter is a promising framework in terms of implementation speed and breadth of coverage. If you are looking for an option to quickly develop an application for iOS and Android with development prospects and without serious losses in quality and budget give Flutter a chance now.

As you could see from the example above, Flutter requires half as many developers if you opt to develop a cross-platform application. Moreover, less code means fewer bugs. In such a situation, there will be less work even for QA Engineers on your project. 

Besides, even after release, you will have to update your application, and in the case of Native development, it will cost you a lot of effort again because each of the platforms will have to be updated separately. However, if you choose Flutter, both development and updates will be executed by one team. Therefore, the choice of Flutter will not only accelerate the development but also will facilitate the processes that will follow.

In our opinion, Flutter has a lot more advantages for business and development teams than risks. It is a great chance to build beautiful, high-performance, and outstanding mobile apps that fit your custom needs and requirements. It is worth considering Flutter, especially if you want an app both for iOS and Android just like we did.