We are excited to announce the 1.0 release of JupyterLab Plugin Playground, allowing you to seamlessly experiment with the creation of Jupyter Notebook and JupyterLab plugins to add any functionality you may desire. To install: pip install jupyterlab-plugin-playground or use it from Binder or JupyterLite without installing anything by clicking one of these links: Binder (Lab) , Binder (Notebook v7) , JupyterLite (Lab) , JupyterLite (Notebook v7) . Motivation Building a JupyterLab extension has traditionally required setting up a complex local environment: installing dependencies from disjoint