Software Alternatives, Accelerators & Startups

Flutter VS CustomTkinter

Compare Flutter VS CustomTkinter and see what are their differences

Flutter logo Flutter

Build beautiful native apps in record time ๐Ÿš€

CustomTkinter logo CustomTkinter

CustomTkinter is a python desktop UI-library based on Tkinter, which provides modern looking and fully customizable widgets.
  • Flutter Landing page
    Landing page //
    2021-12-14
  • CustomTkinter Landing page
    Landing page //
    2026-07-16

Flutter features and specs

  • Cross-Platform Development
    Flutter allows you to create applications that run on multiple platforms, including iOS, Android, web, and desktop, using a single codebase, thereby significantly reducing development time and effort.
  • Hot Reload
    The Hot Reload feature allows developers to see the results of their code changes almost instantly without a full restart, boosting productivity and making the debugging process more efficient.
  • Rich Set of Pre-Built Widgets
    Flutter offers a comprehensive collection of customizable widgets that follow modern design guidelines, allowing developers to build attractive and consistent UIs effortlessly.
  • Performance
    Flutter applications are compiled directly to native ARM code, which can result in superior performance comparable to native applications.
  • Strong Community Support
    As an open-source project, Flutter has a large and active community, providing abundant resources, third-party libraries, and plugins to accelerate development.

Possible disadvantages of Flutter

  • Large App Size
    Flutter apps tend to have a larger file size compared to native apps, which could be a concern for users with limited storage space or slow internet connections.
  • Limited Ecosystem
    While Flutter is growing rapidly, its ecosystem is not yet as mature as those of more established frameworks, meaning that certain third-party libraries, tools, and plugins might be lacking or underdeveloped.
  • Platform-Specific APIs
    Despite its cross-platform capabilities, Flutter may require the development of custom platform-specific code for certain functionalities, which could complicate the development process.
  • Learning Curve
    Flutter uses Dart, a programming language that is less commonly used compared to JavaScript, Java, or Swift, which may result in a steeper learning curve for new developers.
  • State Management Complexity
    Managing states effectively in large applications can be challenging in Flutter, potentially leading to convoluted code if not handled properly.

CustomTkinter features and specs

  • Modern UI Appearance
    CustomTkinter provides a modern, flat, and visually appealing look for Tkinter applications, with rounded corners, better color schemes, and improved widget styling compared to standard Tkinter.
  • Easy Transition from Tkinter
    Since it's built on top of Tkinter and uses similar syntax and widget names, developers familiar with Tkinter can easily transition to CustomTkinter without a steep learning curve.
  • Built-in Dark and Light Mode
    CustomTkinter supports automatic and manual switching between dark and light appearance modes, making it easy to create apps that adapt to system themes or user preferences.
  • Customizable Themes
    The library allows for extensive customization through theme files (JSON), enabling developers to create and apply custom color schemes and styles across their entire application.
  • Cross-Platform Compatibility
    CustomTkinter works across Windows, macOS, and Linux, providing a consistent look and feel across different operating systems, which is an improvement over native Tkinter's platform-dependent appearance.

Possible disadvantages of CustomTkinter

  • Limited Widget Set
    Compared to more mature GUI frameworks like PyQt or Kivy, CustomTkinter offers a smaller set of widgets, which may require additional custom development for complex applications.
  • Performance Overhead
    The additional styling and rendering logic on top of Tkinter can introduce slight performance overhead, especially in applications with many widgets or frequent UI updates.
  • Dependency on Tkinter Limitations
    Since it's built on Tkinter, CustomTkinter inherits some of Tkinter's inherent limitations, such as less flexible layout management and fewer built-in animations compared to modern frameworks.
  • Smaller Community and Ecosystem
    As a relatively newer library, CustomTkinter has a smaller community, fewer third-party extensions, and less extensive documentation compared to more established GUI frameworks.
  • Occasional Bugs and Inconsistencies
    Being under active development, users may encounter occasional bugs, inconsistent behavior across platforms, or breaking changes between version updates that require code adjustments.

Analysis of Flutter

Overall verdict

  • Flutter is generally considered to be a good framework, particularly for developers who prioritize building cross-platform applications with a consistent look and feel across devices. Its performance is comparable to native applications, and its flexibility and ease of use make it a worthy choice for both beginners and experienced developers.

Why this product is good

  • Flutter is a UI toolkit developed by Google that allows developers to create natively compiled applications for mobile, web, and desktop from a single codebase. Its primary strengths include fast development cycles enabled by features like hot reload, a rich set of pre-designed widgets that follow Google's Material Design guidelines, and its use of Dart language which offers excellent performance. Furthermore, Flutter has a strong community and backing by Google, ensuring regular updates and long-term support.

Recommended for

  • Developers looking to create applications for multiple platforms from a single codebase.
  • Those who appreciate material design and need a rich set of customizable widgets.
  • Teams that value rapid iteration and hot reload features for quicker testing and updates.
  • Projects that require good community support and regular updates from a major tech company.

Analysis of CustomTkinter

Overall verdict

  • CustomTkinter is a solid choice for Python developers who want to build modern-looking desktop GUIs without leaving the familiar Tkinter ecosystem. It provides a good balance between ease of use and visual polish, making it especially attractive for smaller to medium-sized projects.

Why this product is good

  • Built on top of standard Tkinter, so it's easy to learn if you already know Tkinter
  • Provides modern, flat-styled widgets with rounded corners and better default aesthetics than vanilla Tkinter
  • Supports light and dark mode theming out of the box, including system theme detection
  • Cross-platform support for Windows, macOS, and Linux
  • Actively maintained with regular updates and a growing community
  • Free and open-source with a permissive license
  • Good documentation and examples to help beginners get started quickly
  • Customizable color themes and widget appearance without needing CSS-like styling

Recommended for

  • Python developers who want a quick way to modernize Tkinter-based UIs
  • Hobbyists and students building desktop apps for personal or academic projects
  • Small business or indie developers creating internal tools or utilities
  • Developers who prefer lightweight GUI frameworks over heavier alternatives like PyQt or Kivy
  • Projects that need dark mode support without complex theming systems
  • Anyone already familiar with Tkinter looking for an easy upgrade path

Flutter videos

beginning of flutter youtube channel

CustomTkinter videos

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Category Popularity

0-100% (relative to Flutter and CustomTkinter)
Development Tools
99 99%
1% 1
Rapid Application Development
Developer Tools
100 100%
0% 0
IDE
0 0%
100% 100

User comments

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Reviews

These are some of the external sources and on-site user reviews we've used to compare Flutter and CustomTkinter

Flutter Reviews

Explore 9 Top Eclipse Alternatives for 2024
With Flutter 2โ€™s release in 2021, developers now have full support to construct intuitive Windows apps, marking another milestone in Flutterโ€™s inclusive cross-platform vision.
Source: aircada.com
Top 10 Flutter Alternatives for Cross-Platform App Development
So, above are some of the Flutter alternatives you can consider for your upcoming projects. To make the right selection, you should analyze the characteristics of your applications, which will help you make the most appropriate selection. You can also get in touch with a Flutter development company to go with the right option.
Top 5 Flutter Alternatives for Cross-Platform Development
Qtโ€™s native capabilities contribute to its good app performance and size. Compared to Flutter, Flutter apps tend to be larger than native apps. However, the frameworkโ€™s features and language are designed to boost Flutter app performance.
Source: www.miquido.com
Exploring 15 Powerful Flutter Alternatives
Beyond official Flutter built by Google, Flutter Community is an open-source fork-adding capability and component. Flutter Community has specifically expanded device testing coverage beyond Googleโ€™s in-house capabilities. With contributors volunteering devices for testing worldwide, Flutter Community tracks compatibility across over 3000 device variants spanning multiple...
Top 10 Android Studio Alternatives For App Development
Flutter is a framework that is used by stack developers to build multi-platform apps from a single codebase. It is an open-source project which was developed by Google to build app UI.

CustomTkinter Reviews

We have no reviews of CustomTkinter yet.
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Social recommendations and mentions

Based on our record, Flutter seems to be more popular. It has been mentiond 372 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Flutter mentions (372)

  • Sandbox#1: Flutter Application Design First Steps
    Let start another chapter of this journey with Dart by creating a mobile application with Flutter. For this post, a really simple application will be created called sandbox. Instead of adding some interactive part, like sending/receiving data from a backend, let simply design an application based on a wireframe. - Source: dev.to / 2 months ago
  • Gemma-San โ€” A Teacher in Every Pocket.
    Built with Flutter + flutter_gemma 0.15.1 + Whisper.cpp + sqflite. Targets 4โ€“6 GB RAM Android phones like the Tecno Spark 10 and Infinix Hot 30 โ€” the phones African kids actually share with their families. - Source: dev.to / 2 months ago
  • AI-Native Mobile Device Automation: Give Your AI Agent Eyes and Hands on Real Phones
    For apps with custom-rendered UIs โ€” React Native, Flutter, games โ€” where the accessibility tree is sparse, MobAI offers an OCR fallback that returns recognized text with tap coordinates. The agent always has something to work with. - Source: dev.to / 3 months ago
  • Introduction to Mobile Game Dev: How to Build a Basic Chess Game on Mobile in Flutter
    Flutter is an open source UI toolkit by Google where a single codebase can be used for cross-platform applications such as for mobile, web and desktop. It has many advantages such as Hot Reload where you can instantly see the changes you make, the dart language that is strongly typed and fast, and as previously mentioned, its cross-platform application. - Source: dev.to / 5 months ago
  • Clone MedTalk: HIPAA-Ready Video and Chat Consultations in Flutter
    To install Flutter on your computer, first open flutter.dev. - Source: dev.to / 6 months ago
View more

CustomTkinter mentions (0)

We have not tracked any mentions of CustomTkinter yet. Tracking of CustomTkinter recommendations started around Jul 2026.

What are some alternatives?

When comparing Flutter and CustomTkinter, you can also consider the following products

React Native - A framework for building native apps with React

PyQt - Riverbank | Software | PyQt | What is PyQt?

import.io - Import. io helps its users find the internet data they need, organize and store it, and transform it into a format that provides them with the context they need.

Kivy - Open source Python framework for rapid development of applications that make use of innovative user interfaces, such as multi-touch apps. Installation on WindowsInstallation on Windows. Installation; What are wheels .

Data Miner - Data Miner is a Google Chrome extension that helps you scrape data from web pages and into a CSV file or Excel spreadsheet.

Qt - Powerful, flexible and easy to use, Qt will help you not only meet your tight deadline, but also reduce the maintainable code by an astonishing percentage.