Software Alternatives, Accelerators & Startups

CustomTkinter VS PyUI Builder

Compare CustomTkinter VS PyUI Builder 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.

PyUI Builder logo PyUI Builder

A GUI builder for Python GUI frameworks
  • CustomTkinter Landing page
    Landing page //
    2026-07-16
  • PyUI Builder PyUIBuilder window
    PyUIBuilder window //
    2025-04-26

PyUIBuilder is a framework agnostic GUI builder. It currently supports tkinter and customtk, it will soon support PySide and kivy. It will also generate clean code in python.

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.

PyUI Builder features and specs

No features have been listed yet.

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

Analysis of PyUI Builder

Overall verdict

  • PyUI Builder appears to be a useful drag-and-drop GUI builder tool that helps Python developers create user interfaces more quickly and with less boilerplate code, though as with any specialized tool its value depends on your specific framework needs and workflow.

Why this product is good

  • Provides a visual drag-and-drop interface that speeds up GUI development and reduces manual coding
  • Generates Python code automatically, which can help beginners learn UI structure and save time for experienced developers
  • Lowers the barrier to entry for building desktop applications without deep knowledge of layout management
  • Can improve productivity for rapid prototyping of Python-based user interfaces

Recommended for

  • Python developers who want to build desktop GUIs quickly without writing all the layout code by hand
  • Beginners learning to create graphical interfaces in Python
  • Developers prototyping application front-ends and iterating on designs
  • Small teams or solo developers seeking to streamline their UI development workflow

CustomTkinter videos

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PyUI Builder videos

Python GUI Builder - PYUIBuilder

Category Popularity

0-100% (relative to CustomTkinter and PyUI Builder)
Rapid Application Development
Developer Tools
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IDE
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Python Tools
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Questions & Answers

As answered by people managing CustomTkinter and PyUI Builder.

Which are the primary technologies used for building your product?

PyUI Builder's answer:

React, JS and tailwindCSS along with a bit of Python

What makes your product unique?

PyUI Builder's answer:

It's the only Python GUI tool on the market that supports development across multiple frameworks, offers third-party plugin support, and works seamlessly in the browser.

Why should a person choose your product over its competitors?

PyUI Builder's answer:

A person should choose PyUI Builder because it's the only Python GUI tool that allows development across multiple frameworks, supports third-party plugins, and runs directly in the browser. This flexibility gives developers the freedom to work with their preferred technologies, extend functionality with plugins, and build interfaces from anywhere โ€” something no other tool currently offers.

How would you describe the primary audience of your product?

PyUI Builder's answer:

Primary audience are python developers, professionals and students who are using Python for data science, Ml and want a quick UI without the hassle of writing the code

User comments

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Social recommendations and mentions

Based on our record, PyUI Builder seems to be more popular. It has been mentiond 5 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.

CustomTkinter mentions (0)

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

PyUI Builder mentions (5)

  • Show HN: Published my first Desktop app after 6 months of work โ€“ PyUiBuilder
    Hi all, I have been working on a tool for python developers that helps them create GUIs using Drag and Drop for over 6 months, recently published it as an Electron App after a lot of work. The tools allows you to drag and drop widgets and generate equivalent Python Code in Tkinter and customttk, and, will soon support PySide as well. You can check out the web version here: https://pyuibuilder.com Github Url: - Source: Hacker News / about 1 year ago
  • Python GUI full course โ€” Learn GUI development in 15 mins
    That was it, now you can try out other widgets on PyUiBuilder and familiarize yourself with Tkinter. - Source: dev.to / about 1 year ago
  • Here's how to build a Canva like UI using Reactjs
    I am going to be talking about PyUiBuilder, a convenient drag and drop tool like Canva I am working on to help Python developers develop Python GUI's easily. - Source: dev.to / about 1 year ago
  • 10 Useful Tools and Libraries for Python Developers
    If youโ€™re building desktop applications, PyUIBuilder is a lifesaver. Instead of writing tedious UI code by hand, PyUIBuilder gives you a drag-and-drop interface for designing GUI applications. It outputs clean python code so you can edit later on. Currently it supports tkinter and customtk. - Source: dev.to / over 1 year ago
  • Create Tkinter GUIโ€™s using Tkinter GUI Builder โ€” PyUiBuilder
    If your starting out with tkinter, it can be overwhelming without prior understanding of GUIs. Whether you are trying to make a simple school project or are trying to create an internal application for your company, Tkinter GUI Builder will make this entire process easier. - Source: dev.to / over 1 year ago

What are some alternatives?

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

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

Qt Creator - Qt Creator is a cross-platform C++, JavaScript and QML integrated development environment. It is the fastest, easiest and most fun experience a C++ developer could wish for.

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.

Canva - Canva is a graphic-design platform with a drag-and-drop interface to create print or visual content while providing templates, images, and fonts. Canva makes graphic design more straightforward and accessible regardless of skill level.