Flutter

It is powered by Google, so a great technical community is backing it.

The development of native apps is an easy process using Flutter.

As it is an open-source tool, we can use it without paying anything.

It provides nice UI options.

It still needs stability, there are too many frequent updates.

It requires learning a new programming language, i.e. Dart. However, one can learn it easily if you have previous experience with JS or any similar language.

Documentation is too technical.

We can quickly test and code online via Dartpad for better & quicker development.

We can build apps with cross-compatibilities using a single codebase.

It has many widget options for better app development.

Web applications built using Flutter still need so many improvements, like SEO friendly, server-side and client-side codes.

Frequent updates are frustrating.

It is not widely adopted.

Flutter has one of the greatest user interface in world of mobile app development.

It offers positive user experience.

Flutter has a large knowledge base and various tutorials available.

To use Flutter, we have to learn a new programming language.

They could offer more theme options to choose from.

Powered by Google, so reliable technology and great community support.

Developing cross-platform apps with Flutter is an easy task. It saves a huge time and money.

Its user interface is quite good and efficient.

It might be difficult to learn, as it is based on Dart instead of Java or Kotlin.

As flutter is comparatively new, there are not enough tutorials or samples for all use cases.

Doesn't work that great for web-based solutions.

It allows the development of apps for both Android and iOS using a single Codebase.

It has a great user interface.

As it is powered by Google, we have the support of a top community of developers.

As Flutter, by Google is comparatively new in the native development, there are frequent updates and some features occasionally go deprecated.

It requires a good knowledge of Dart Programming Language.

Initial setup might be a little bit difficult for beginners.

Hot Reload

Open Source and Ecosystem

Beautiful UI

Cross-Platform Capabilities

Self-Help content (Tutorials, YouTube, ...) - really great resources

Widget Extension

Debugger could be a bit more clearly sometimes

Documentation could be a bit more clearly sometimes

Documentation is well managed by google.

Custom made widget available to use.

High performance code.

App size became larger with Flutter.

Dart language is used in Flutter, which initial time taken to learn.

Cross platform building, across iOS and Android.

Opinionated, so it's good.

Threading and handling of basic use cases is easy and straight forward.

New language learning, and a new platform. So, a bit of a learning curve and tough to enter.

More resources and docs for even the extreme cases would help take this platform even further

Create Multi-Platform Applications.

Create Scalable Applications.

Work and Deliver applications faster to clients.

Huge Community and good support.

It still lacks a lot of features that you can get from platform-dependent programming languages.

It still has some bugs here and there.

Fast

Customizable

User Friendly

Aesthetically Pleasing

Large File Size

iOS Support

Not fully browser supported

Cross-platform support and development

Native Features Access (for instance, reuse of Kotlin and Swift in development)

Instant changes in the app

Smooth performance, especially for UX

Minimizing the code size (in MBytes), compared to Kotlin and Swift

Future support of web apps

High entry level - learning Dart language (not very popular one)

Cross Platform Development.

Mobile UI Theming.

Supportive Dev Community.

Easy to setup and test.

Customizing Components.

Third Party Library Size.

Historical knowledge base (due to Flutter's relative newness!).

Performance

Time to market really low

Animations are super easy, and very nice

A lot of useful and ready to use libraries can be found in dev.pub

Difficult at first

Dart is not a commonly used language

Cross-platform.

Easy to prototype.

Easy to have platform specific logic.

Flutter doctor.

Specific API, especially no support for Apple Pencil.

Same thing for coreML.

Not a real IDE dedicated for Flutter.

Google product, can be dropped at any time.

Decreases development by half, sometimes more.

Increases collaboration by providing our developers a shared language and codebase to work with.

Generally strong performance, with very few noticeable performance drop-offs, compared to native code.

Extremely strong plugin ecosystem and developer community.

Occasionally updates to the Flutter SDK result in wide-sweeping changes that seem to not be thoroughly tested and considered. Flutter sometimes evolves too fast for its own good.

While the 3rd-party Flutter package ecosystem is vast and rich, 1st-party support for basic things (audio/video playback, battery information, Bluetooth services, etc.) are lacking. You are occasionally forced to rely on an open-source package for use-cases that other platforms have native support for.

Documentation, particularly around testing, is lacking. While there are some great docs, like the Dart Style Guide, many Flutter-focused support documents are lacking in quality and real-world usability.

Flutter allows you to architect an app however you want. While this is a great feature, it also adds complexity and leads to the current state of Flutter's state management, where there are 50+ options on how to organize your app, with very little official guidance or recommendations from the Flutter team. For a beginner, this can create decision paralysis.

It's cross platform for developing Android, IOS and Web applications.

It's designed with native feels

It's very easy to learn and adopt

There is limited number of libraries but it will grows as per time.

Application size are bigger in size than native application

User interface design works great across all platforms, including native styling for iOS/macOS.

Native compilation for mobile platforms and a decent rendering engine results in slick apps that can make the most of your device.

Dart is a well thought out language and easy to pick up.

Makes cross-platform development of good looking GUI apps a doddle.

Flutter has a relatively young ecosystem. It's growing fast and looks like it's here to stay, but it will take time for it to mature fully.

A problem that plagues all cross-platform GUI frameworks - the 'look and feel' can be awkward to perfect for all targets from a single layout. To be fair, it's hard to see how this could be improved much, and it is worth accepting you may need to use platform specific layouts in some situations.

Strong ties to the Dart language may put some developers off, as it's not the widest known of languages. However, it is easy to pick up, and makes for a very pleasant to use, static typed language.