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CustomTkinter VS Qt

Compare CustomTkinter VS Qt and see what are their differences

CustomTkinter logo CustomTkinter

CustomTkinter is a python desktop UI-library based on Tkinter, which provides modern looking and fully customizable widgets.

Qt logo 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.
  • CustomTkinter Landing page
    Landing page //
    2026-07-16
  • Qt Landing page
    Landing page //
    2023-10-22

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.

Qt features and specs

  • Cross-Platform Development
    Qt allows developers to write applications that can run on multiple platforms, including Windows, macOS, Linux, Android, and iOS, without the need for significant code changes.
  • Rich Documentation
    Qt provides extensive and well-maintained documentation, making it easier for developers to learn and troubleshoot the framework.
  • Mature and Stable
    Being a mature framework, Qt has a long history of stability and a strong track record in producing robust applications.
  • Comprehensive UI Components
    Qt offers a wide range of built-in UI components, which can significantly speed up the development process and provide a native look and feel on different platforms.
  • Strong Community Support
    Qt has an active and helpful community, which can be beneficial for developers seeking support or looking to collaborate on projects.
  • Performance
    Applications built with Qt tend to be efficient and performant, due to close-to-the-metal coding options and optimizations available in the framework.
  • Tooling
    Qt Creator, the official IDE for Qt, offers powerful tools for designing, coding, testing, and debugging applications, enhancing productivity.

Possible disadvantages of Qt

  • Licensing Costs
    Though Qt offers an open-source option, commercial licenses can be expensive, which can be a significant constraint for smaller businesses or independent developers.
  • Learning Curve
    The framework can have a steep learning curve for beginners, especially for those unfamiliar with C++ or the specific paradigms Qt employs.
  • Large Executable Size
    Applications built with Qt can have larger executable sizes compared to those built with more lightweight frameworks, which might be a concern for some applications.
  • Dependency on C++
    While Qt has bindings for other languages like Python (PyQt, PySide), its core is based on C++, which might not be ideal for developers looking for a more modern or different programming language.
  • Complexity in Customization
    While Qt offers many features out-of-the-box, deep customization, especially for non-standard requirements, can become complex and time-consuming.
  • Build Times
    Due to its comprehensive nature, applications using Qt can have longer build times, which can slow down the development cycle.

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

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Qt videos

Review of Qt 5.4

More videos:

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Category Popularity

0-100% (relative to CustomTkinter and Qt)
Rapid Application Development
Development Tools
8 8%
92% 92
IDE
100 100%
0% 0
Developer Tools
0 0%
100% 100

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Reviews

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Qt Reviews

Top 5 Flutter Alternatives for Cross-Platform Development
Qt is a versatile C++ framework known for its efficiency and flexibility. With Qt, developers can create cross-platform applications with native-like performance.
Source: www.miquido.com
Exploring 15 Powerful Flutter Alternatives
Qt is a mature, cross-platform native framework for building apps and devices using C++. Qt sees extensive use in embedded systems requiring slick UIs on low-power devices with limited memory. It compiles nearly identically to straight C++ while adding conveniences like signals and slots that feel akin to JavaScript event handling. But apps targeting desktops, servers, and...
Best GUI frameworks for Go
Qt is a cross-platform application development framework widely used for developing desktop, mobile, and embedded systems. Qt provides a powerful, easy-to-use, and flexible C++ class library for building GUIs and other types of applications. Qt has a wide range of built-in widgets, including buttons, labels, list boxes, and more.
10 Best Tools to Develop Cross-Platform Desktop Appsย 
Written in C++, this cross-platform framework is used for native embedded, desktop, and mobile applications using GUI widgets and quick modules using QML language. C++ is a backend and QML (QtQuick 2) is a frontend side. Its meta-object compiler runs before the build. Qt can be used in several programming languages like Python, JavaScript, and others due to language...
Top Cross-Platform App Development Frameworks
Qt is a pretty mature GUI and cross-platform app development framework that dates back to 1995. Developers can use Qt for crafting applications for mobiles, embedded platforms, or desktops. As Qt is based on C++, any developer with a decent C++ experience (pretty easily found) can help you craft a cross-platform app using Qt with a single codebase.
Source: www.pangea.ai

What are some alternatives?

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

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

GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.

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 .

Xamarin - Create iOS, Android and Mac apps in C#

WompMobile - WompMobile offers tow kind of functions โ€“ first creating new mobile apps and secondly converting the websites into mobile applications.

wxWidgets - wxWidgets: Cross-Platform GUI Library