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CustomTkinter VS PySide

Compare CustomTkinter VS PySide 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.

PySide logo PySide

Qt for Python - Qt Wiki
  • CustomTkinter Landing page
    Landing page //
    2026-07-16
  • PySide Landing page
    Landing page //
    2023-07-27

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.

PySide features and specs

  • Official Support
    PySide is officially supported by the Qt Company, ensuring regular updates and a reliable source of information for developers.
  • Cross-Platform
    PySide allows developers to create applications that run on various operating systems, including Windows, macOS, and Linux, with little to no code modification.
  • Comprehensive Documentation
    PySide is backed by extensive and well-maintained documentation, making it easier for developers to find solutions and learn the framework effectively.
  • Open Source
    PySide is available under the LGPL license, allowing developers to use it in open-source and commercial projects without licensing fees.
  • Bindings for QT Libraries
    Provides Python bindings to the Qt libraries, which are highly reputable for their performance and extensive functionality in GUI development.

Possible disadvantages of PySide

  • Potential Licensing Issues
    While PySide is LGPL licensed, understanding its requirements for dynamic linking and distribution can be complex for some projects.
  • Memory Consumption
    Applications developed using PySide can sometimes consume more memory compared to other lightweight frameworks, impacting performance in resource-constrained environments.
  • Complexity for Beginners
    The vast array of features and options available in PySide might be overwhelming for beginners, requiring a steep learning curve to master.
  • Community Size
    PySide's community is smaller compared to other Python GUI frameworks like Tkinter or PyQt, possibly leading to fewer third-party resources and community support.
  • Size of Deployment
    Qt libraries can be large, resulting in increased application size, which can be problematic for users with limited bandwidth or storage.

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

CustomTkinter videos

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PySide videos

python tutorials - A More Practical PySide Example

More videos:

  • Review - Pyside2 Introduction & Installation | Qt For Python | Python GUI Development | Pyside2 Vs PyQt5

Category Popularity

0-100% (relative to CustomTkinter and PySide)
Rapid Application Development
Development Tools
31 31%
69% 69
IDE
100 100%
0% 0
Development
32 32%
68% 68

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Reviews

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PySide Reviews

25 Python Frameworks to Master
Itโ€™s a great option for creating simple and easy-to-use graphical user interfaces in Python and allows you to add a GUI to your already working scripts pretty easily. PySimpleGUI wraps the power of 4 different GUI libraries, PySide, Tkinter, wxPython, and Remi.
Source: kinsta.com
Which Python GUI library should you use? Comparing the Python GUI libraries available in 2023
Before the Qt Company (under Nokia) released the officially supported PySide library in 2009, Riverbank Computing had released PyQt in 1998. The main difference between these two libraries is in licensing. The free-to-use version of PyQt is licensed under GNU General Public License (GPL) v3 but PySide is licensed under GNU Lesser General Public License (LGPL). This means...
Top 10 Python GUI Frameworks for Developers
PySide2 is built by the same company that gave us the widely popular application development framework Qt. Upon looking closely, youโ€™ll come across the term โ€œQt for Python Projectโ€, which is nothing but the task of porting PySide to support Qt5, whereas the framework itself is now being called PySide2.

What are some alternatives?

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

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

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 .

Tkinter - Tkinter is a Python wrapper for Tcl/Tk that offers classes to create various graphical user interfaces.

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.

PySimpleGUI - A simple to use GUI that can create custom GUIs

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