JupyterLab
The next-generation web IDE for Jupyter - notebooks + file browser, terminal, editor, extensions.
- Multi-pane layout with drag-and-drop cells.
- Notebook 7 is itself built on JupyterLab.
- Long-term successor to the classic UI.
When to use: Default local Jupyter UI for serious work; multi-notebook editing.
Example: File browser left, two notebook tabs, terminal in bottom split, kernel monitor on the right.