Kivy (framework)

From Wikipedia, the free encyclopedia
Developer(s)Kivy organization
Initial release1 February 2011; 12 years ago (2011-02-01)[1]
Stable release
2.2.1 / 17 June 2023; 5 months ago (2023-06-17)[2]
Written inPython, Cython
Operating systemCross-platform
TypeApplication framework
LicenseMIT (Free software)

Kivy is a free and open source Python framework for developing mobile apps and other multitouch application software with a natural user interface (NUI). It is distributed under the terms of the MIT License, and can run on Android, iOS, Linux, macOS, and Windows.

Kivy is the main framework developed by the Kivy organization,[3] alongside Python for Android,[4] Kivy iOS,[5] and several other libraries meant to be used on all platforms. In 2012, Kivy got a $5000 grant from the Python Software Foundation for porting it to Python 3.3.[6] Kivy also supports the Raspberry Pi which was funded through Bountysource.[7]

The framework contains all the elements for building an application such as:

Kivy is an evolution of the PyMT project.[9]

Code example[edit]

Here is an example of the Hello world program with just one button:

from import App
from kivy.uix.button import Button

class TestApp(App):
    def build(self):
        return Button(text="Hello World")


Kv language[edit]

The Kv language is a language dedicated to describing user interface and interactions in Kivy framework. As with other user interface markup languages, it is possible to easily create a whole UI and attach interaction. For example, to create a Loading dialog that includes a file browser, and a Cancel / Load button, one could first create the base widget in Python and then construct the UI in Kv.


class LoadDialog(FloatLayout):
    def load(self, filename): pass
    def cancel(self): pass

And in the associated Kv:

#:kivy 1.11.1

        size: root.size
        pos: root.pos
        orientation: "vertical"

            id: filechooser

            size_hint_y: None
            height: 30

                text: "Cancel"
                on_release: root.cancel()

                text: "Load"
                on_release: root.load(filechooser.path, filechooser.selection)

Alternatively, the layout (here, Box Layout) and the buttons can be loaded directly in the file.

Related projects[edit]

Google Summer of Code[edit]

Kivy participated in Google Summer of Code under the Python Software Foundation.

  • Kivy in GSoC'2014.[10]
  • Kivy in GSoC'2015.[11]
  • Kivy in GSoC'2016.[12]
  • Kivy in GSoC'2017.[13]

See also[edit]


  1. ^ "Kivy changelog",, retrieved 2016-04-05
  2. ^ "Kivy 2.2.1". 2022-06-17. Retrieved 2022-04-04.
  3. ^ "About us",
  4. ^ "Python for Android",
  5. ^ "Kivy for iOS",
  6. ^ "Kivy and Python 3.3, project started", Google Groups
  7. ^ "Kivy on Raspberry Pi",
  8. ^ "Programming Guide » Kv language",
  9. ^ "FAQ: How is Kivy related to PyMT?",, retrieved 2012-06-09
  10. ^ "Google Summer of Code 2014 @ the Python Software Foundation".
  11. ^ "Google Summer of Code 2015 @ the Python Software Foundation".
  12. ^ "Google Summer of Code 2016 @ the Python Software Foundation".
  13. ^ "Google Summer of Code 2017 @ the Python Software Foundation".

External links[edit]