A modern and customizable python UI-library based on Tkinter
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CustomTkinter UI-Library

| on Windows 11 with dark mode and 'dark-blue' theme

| on macOS in light mode and standard 'blue' theme

CustomTkinter is a python UI-library based on Tkinter, which provides new, modern and fully customizable widgets. They are created and used like normal Tkinter widgets and can also be used in combination with normal Tkinter elements. The widgets and the window colors either adapt to the system appearance or the manually set mode ('light', 'dark'), and all CustomTkinter widgets and windows support HighDPI scaling (Windows, macOS). With CustomTkinter you'll get a consistent and modern look across all desktop platforms (Windows, macOS, Linux).


Install the module with pip:

pip3 install customtkinter

Update existing installation: pip3 install customtkinter --upgrade
(update as often as possible because this library is under active development)


The official documentation can be found in the Wiki Tab here:

--> Documentation.

Example Program

To test customtkinter you can try this simple example with only a single button:

import tkinter
import customtkinter

customtkinter.set_appearance_mode("System")  # Modes: system (default), light, dark
customtkinter.set_default_color_theme("blue")  # Themes: blue (default), dark-blue, green

app = customtkinter.CTk()  # create CTk window like you do with the Tk window

def button_function():
    print("button pressed")

# Use CTkButton instead of tkinter Button
button = customtkinter.CTkButton(master=app, text="CTkButton", command=button_function), rely=0.5, anchor=tkinter.CENTER)


which gives the following (macOS dark mode on):

In the examples folder, you can find more example programs and in the Documentation you can find further information on the appearance mode, the themes and all widgets.

More Examples and Showcase

Appearance mode change

On Windows 10/11 you get a dark window header, which changes with set appearance mode or the system, when you use customtkinter.CTk() to create the window, and it works with all python versions:

| on Windows 11 with system mode change and standard 'blue' theme

On macOS however you either need python3.10 or higher or the anaconda python version to get a dark window header at all (Tcl/Tk >= 8.6.9 required).

| on macOS with system mode change and standard 'blue' theme

Button with images

It's possible to put an image on a CTkButton. You just have to pass a PhotoImage object to the CTkButton with the image argument. If you want no text at all you have to set text="" or you specify how to position the text and image at once with the compound option:

| on macOS

Integration of TkinterMapView widget

In the following example I used a TkinterMapView which integrates well with a CustomTkinter program. It's a tile based map widget which displays OpenStreetMap or other tile based maps:

| examples/ from TkinterMapView repository on macOS

You can find the TkinterMapView library and the example program here: