nbclassic
Jupyter Notebook as a Jupyter Server extension.
Decision gist · record as of 2026-08-14
Yes, if you rely on classic Jupyter Notebook extensions or customizations and need to upgrade to modern Jupyter Server. The package is actively maintained, has low install friction, and is widely used (top 5000 on PyPI). Install it when you want to defer rewriting extensions or when your team needs the classic interface alongside newer frontends.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Jupyter Server to be installed; nbclassic runs as an extension on top of it.
- Low install friction with a pure Python wheel distribution.
- Actively maintained as of June 2026 with recent commits, and supported on current Python versions (3.9–3.13).
License · maintenance · safety
permissive license (permissive) — BSD 3-Clause License permits commercial and private use with minimal restrictions; you must retain copyright notice and disclaimer in source distributions.
last release 2025-09-16 (332 days) · last repo commit 2026-06-29 · 110 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 6,497,028 downloads/mo, #1,899 on PyPI
Alternatives
Verify before relying
pip install nbclassic
jupyter nbclassic- Whether existing classic notebook extensions are fully compatible without modification.
- Performance characteristics compared to Notebook 7 or JupyterLab on the same system.
- Scope of customizations that will continue to work unchanged from classic Notebook.
What it is and what it does
nbclassic bridges the gap between the classic Jupyter Notebook and the modern Jupyter ecosystem. It runs the traditional notebook interface as a Jupyter Server extension, preserving the familiar UI and URL namespace (`/nbclassic/`) so you can keep using classic extensions and customizations that may not yet work with newer frontends. The package depends on ipykernel, ipython-genutils, nest-asyncio, and notebook-shim to provide kernel communication and async handling.
You install it alongside Jupyter Server and can launch it with `jupyter nbclassic` or access it through the main Jupyter Server. This lets you upgrade to the latest Jupyter infrastructure without immediately breaking your existing notebook workflows, custom extensions, or theme customizations—you can run the classic interface, JupyterLab, and Notebook 7 all in the same installation.
Use it for
- Migrate to modern Jupyter Server infrastructure while keeping classic notebook extensions working.
- Run the familiar classic notebook UI for users who prefer it over JupyterLab or Notebook 7.
- Preserve custom CSS, JavaScript, and notebook extensions that haven't been ported to new frontends.
- Maintain backwards compatibility during a gradual transition from classic Notebook to newer interfaces.
- Coexist with JupyterLab in a single Jupyter installation for teams with mixed preferences.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you rely on classic Jupyter Notebook extensions or customizations and need to upgrade to modern Jupyter Server.
The package is actively maintained, has low install friction, and is widely used (top 5000 on PyPI). Install it when you want to defer rewriting extensions or when your team needs the classic interface alongside newer frontends.
Install
nbclassic on PyPI
Before you install
Low install friction with a pure Python wheel distribution. Actively maintained as of June 2026 with recent commits, and supported on current Python versions (3.9–3.13).
Requires Jupyter Server to be installed; nbclassic runs as an extension on top of it.
License in practice
BSD 3-Clause License permits commercial and private use with minimal restrictions; you must retain copyright notice and disclaimer in source distributions.
Quickstart
pip install nbclassic
jupyter nbclassicVerify before relying
- Whether existing classic notebook extensions are fully compatible without modification.
- Performance characteristics compared to Notebook 7 or JupyterLab on the same system.
- Scope of customizations that will continue to work unchanged from classic Notebook.
Package facts
| License | permissive license permissive |
| Python support | Supports the current Python release >=3.9 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 4 packagesipykernelipython-genutilsnest-asyncionotebook-shim |
| Maintenance | Actively maintained 332 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 6,497,028 / month, #1,899 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Intended Audience :: DevelopersIntended Audience :: Science/ResearchIntended Audience :: System AdministratorsLicense :: OSI Approved :: BSD LicenseProgramming Language :: PythonProgramming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.9 |
Evidence: nbclassic-1.3.3-py3-none-any.whl
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See also jupyter-collaboration-ui · notebook-shim · notebook · jupyter-server-documents · jupyterlab-widgets · jupyterlab · widgetsnbextension · jupyter-collaboration · jupyterlab_notebook_awareness · pyviz-comms