Start a new Briefcase project. Runs a wizard to ask questions about your new application, and creates a stub project using the details provided.


To start a new application, run:

$ briefcase new


The following options can be provided at the command line.

-t <template> / --template <template>

A local directory path or URL to use as a cookiecutter template for the new project.

--template-branch <branch>

The branch of the cookiecutter template repository to use for the new project. If not specified, Briefcase will attempt to use a template branch matching the version of Briefcase that is being used (i.e., if you’re using Briefcase 0.3.14, Briefcase will use the v0.3.14 template branch when generating the app). If you’re using a development version of Briefcase, Briefcase will use the main branch of the template.


Override the answer to a new project prompt with the provided value.

For instance, if -Q "license=MIT license is specified, then the question to choose a license will not be presented to the user and the MIT license will be automatically used for the project. When used in conjunction with --no-input, the provided value overrides the default answer.

The expected keys are specified by the cookiecutter template being used to create the new project. Therefore, the set of possible keys is not listed here but should be expected to remain consistent for any specific version of Briefcase; with version changes, though, the keys may change.

Third-party Bootstraps

When you run new project wizard, you are asked to select a GUI toolkit. Briefcase includes bootstraps for Toga (BeeWare’s cross-platform GUI framework), PySide6 (Python bindings for the Qt GUI toolkit) and Pygame (a common Python game development toolkit), as well as an “empty” bootstrap that doesn’t include any GUI code. However, Briefcase provides a plug-in interface that allows GUI toolkits to provide a their own bootstrap implementation.

The following third-party bootstraps are known to exist:


Package name




“Unbearably fun game development”. A game toolkit with a focus on being education friendly and exposing an idiomatic Python interface.



A fork of pygame, the classic library for making games in Python.

To add a third-party bootstrap, pip install the named package into the virtual environment that contains Briefcase, then run briefcase new. The new bootstrap option should be added to the list of GUI toolkits.