About Flutter:
Flutter is an open-source UI software development kit created by Google. It is used to develop applications for Android, iOS, Windows, Mac, Linux, Google Fuchsia, and the web. The first version of Flutter was known as codename "Sky" and ran on the Android operating system. Wikipedia.

1. Ionicfirebbaseapp:

IT is an Indian based company that has to build a Flutter App Marketplace along with a fully functional SaaS application that has been using that more than 50+ counting business You may find more details on their Flutter Apps Marketplace. They have the expertise to provide SaaS applications along with Angular, NodeJS development, Hybrid Apps Development.

As well as they developed an open-source UI Library on Flutter SDK that has been recognized as one the largest and best open-source UI Library for Flutter development. You may find the details about this Library on GetFluter or you can check out their GitHub: GetFlutter GitHub

2. BrainMobi

Brainmobi uses its expertise in Flutter for the design and development of high-quality feature-rich native applications supported with rich native UI in less development time. Flutter developer's expertise in leveraging the efficient architecture and implementation methods to ensure fluid user experience for end-users.

Their passion to provide best in class mobile apps helped them get expertise in the style and functioning of widgets and eventually be one of the best Flutter app development companies developing cross-platform apps in all industry domains.

3. Bacancy Technology

Their expertise in Flutter along with IoT, blockchain and other emerging technologies helped them to be one of the most thriving mobile and web app development companies on a global level.

They have a passionate team of software engineers, project managers, and strategists who believe in uniting their skills to develop business solutions for achieving clients' business objectives.

Apart from Flutter app development, their area of expertise include below

Product Development
QA, Automation, and DevOps
Digital Marketing
Their high end end-to-end mobile application development solutions are the result of innovative product development.

4. Mentormate

Mentormate offers comprehensive services for Flutter App Development. Utilizing this cutting-edge technology, the developer can give end-users a swift and smooth experience with a flutter framework to use an application with ease. An application built with Flutter development requires single coding for both different platforms so it saves time while testing it.

5. Mobomo

Mobomo is the leading outsourcing offshore Flutter Cross-Platform Mobile App Development company. Hire Flutter developers to build native apps on iOS and Android from a single codebase.

6 GeekyAnts

Another great flutter app development company based in India with a focus on mobile and web app development. Technologies including Flutter, React, React Native, Angular, Laravel, VueJS, NodeJS, and PHP are used to delight users with impressive as well as feature-rich mobile apps.

Their tech expertise and curiosity to explore what’s new are behind the development of innovative tools like NativeBase, NativeBase Market, and BuilderX.

7 Ripen Apps

Ripen Apps expertise in Flutter app development and passion to develop hybrid mobile apps for impressive user experience ensures end user gets a feature-rich mobile app with the eye-catching user interface.

They have experience of developing apps in different industry domains to help their client expand their business and increase the ROI. Their love for getting equipped with technologies helped them build an impressive portfolio.

8. Xongo Lab

Xongo Lab is known for delivering the best quality of services that perfectly match the industry benchmarks, as well as rigorous testing methods, ensures the application is error-free always.

They are among the leading flutter app development company due to their ability to integrate extra extensions into the Flutter app development process as well as expertise in creating widgets that are as per project requirement. They are professionals who value the time of the client and always do their job within the deadline.

9. Icoderz Solutions

They have an innovative and tech-savvy Flutter mobile app development team that is capable of developing customized cross-platform mobile apps. In this manner, they are developing affordable business solutions for their clients.

Cost-Effective, Eye-Catching, and High Performance are the qualities that form the basis of mobile apps developed by Icoderz Solutions using Google’s Flutter.

10. HyperLink Infosystem

Hyperlink Infosystem is recognized among the finest Flutter app development companies around the globe. Within a short span of time since the release of Flutter they have achieved a professional level of expertise in style and methods of Flutter.

They believe in delivering the fastest and smartest solution for cross-platform mobile app development using Flutter. This helps them to boost client business on a global level with next-gen mobile apps that are flexible and ensures immersive end-user experience that too in less time.

They have a team of developers skilled in Flutter app development who focus on developing better business solutions by leveraging the benefits that come with Google’s Flutter framework.

Some of the popular apps built with Flutter framework?

Flutter is a tech designed by Google and it is launched in May 2017. The flutter is an amazing tech and as mentioned on their website flutter is a mobile SDK meant for designing high performance and high-fidelity mobile apps for iOS and Android using a single code base.

** Google Pay**
In Sept 2020 Google has released a new version of Google Play that built with Flutter. This is a great move toward making more authentic for enterprise development adoption.

Google Ads:

Google Ads makes it easy to show the world what’s unique about your business, so you can reach customers searching for what you offer.

Alibaba.com:

Alibaba.com is the leading platform for global wholesale trade. They serve millions of buyers and suppliers around the world.

Appletree:

AppTree is an enterprise app platform that accelerates your business by solving common enterprise app build, deploy and support challenges. Every feature in their platform is one more problem you don’t have to solve.

Reflectly:

Reflect is a journal utilizing artificial intelligence to help you structure and reflect upon your daily thoughts and problems.

Hamilton Musical:

Hamilton, An American Musical is a sung-and-rapped through musical about the life of American Founding FatherAlexander Hamilton, with music, lyrics, and book by Lin-Manuel Miranda, inspired by the 2004 biography Alexander Hamilton by historian Ron Chernow.

Google Green Tea:

An internal customer management app used widely by Google sales that provide rich visualizations for tracking sales targets.

Abbey Road Studios:

Abbey Road Studios is the most famous recording studios in the world and a global music icon. Originally a nine-bedroom house built in 1829, it was purchased by the Gramophone Company in 1928 who went on to build the world’s first purpose-built recording studio.

Tencent:

Tencent is an internet-based technology and cultural enterprise headquartered in Shenzhen, China. Founded in 1998, Tencent’s mission is to “improve the quality of life through Internet value-added services”.

JD Finance:

JD Finance is a digital technology company. With the core technologies of big data, artificial intelligence, Internet of Things, blockchain. The company has completed the comprehensive layout of digital finance, digital enterprise services and digital cities in three major areas, and realized personal and enterprise in the customer base.

Is Flutter framework stable for the production of enterprise mobile app development?

Flutter, Google’s toolkit for building native apps on iOS and Android.

from a single code base. We’ve seen global brands from all around the world using Flutter to build their apps. These challenges all still exist because the current options out there all involve compromise.

In fact, there are two main ways to build apps today, each which poses a different set of compromises on these four priorities.

We call it the dilemma of mobile app development.

Flutter’s a third approach, one that calls for neither of these sets of compromises.

It’s fully native. Everything written in Flutter compiles directly to native machine code, meaning what you get on your phone, it is exactly what was written.

There’s no context switch. But it’s also a single code base.

So you get that straight path to the castle.

You can go to flutter.dev and download it directly, or if you already have Flutter, simply update.

Google had launched Flutter Create, which is a competition for developers to build an app in Flutter in less than 5 kilobytes of Dart code. And we have some really cool prizes, but it’s also a fun way to get quickly involved in the Flutter community and onboarded with the platform.

Now, there are 3 common ways people are using Flutter today.

The first is to build a brand new app from scratch using Flutter. So if you have an idea or an app that you want for your business, now would be a perfect time. Because you develop in one place, ships natively on all platforms.

The second way is to actually build Flutter for the other OS. What we mean by that is, if you already have an iOS or Android application, and you want to build the other one to reach more users, you can build that other one with Flutter and get it out quickly and eventually merge the codebases.

And thirdly, add Flutter to your existing app.

I’m sure many of you and your businesses already have applications. The good news is you can use Flutter for that.

Flutter Had high customization of the natively available elements.

It is stable, so there’s no performance degradation when merchants used the app for business.

If there’s anything that we want to do to extend Flutter, either on top by building our apps or in the middle, by forking it or adding functionality in between, that you can do that.

So at the bottom of the architecture is the engine. And this is built in C++ code. It’s meant to be the fastest possible thing it can be. So it’s built at the low level to do a drawing and low-level rendering.

Now, on top of that, everything else is built with Dart. When it comes to features of a modern UI framework.