QuantStack developers are behind major open-source projects which you already use and love.

Project Jupyter

QuantStack is one of the main organizations supporting the Jupyter project, an open-source ecosystem of developer tools meant to improve the workflows of scientists and engineers.

In the past few years, Jupyter has become a de-facto standard in both industry and academia, at the foundation of the main open-source and commercial data science platforms, with millions of users.

The team comprises seven core contributors and maintainers the project. We are also behind several popular extensions for data visualization, robotics, and dashboarding.

The QuantStack team is responsible for several major evolutions in the project, such as the JupyterLab visual debugger, and collaborative editing.


QuantStack is the main organization behind the Xtensor project, a fast N-D array library in modern C++, with Python, R, and Julia bindings.

With the Xtensor project, we strive to offer high-level C++ API similar to the NumPy API, but the performance of fine-tuned SIMD-accelerated code.

The xsimd project, which underlies the SIMD acceleration of xtensor has been adopted well beyond the xtensor project, as it has been adopted in major open-source projects such as Pythran and Apache Arrow.


Conda-forge is a community-led build infrastructure and a distribution of scientific computing packages. Over the past few years, it has become one of the main source of such packages, with over two thousand contributors, tens of thousands of packages, and hundreds of millions of package downloads per month.

QuantStack contributes to the conda-forge project as we maintain a large number of recipes ranging from the Jupyter ecosystem to industrial robotics package, and we help maintain the tooling underlying the distribution.


Our latest endeavor is the Mamba project, a fast drop-in replacement for the conda package manager. Mamba can be several orders of magnitude faster than conda to resolve compatibility contraints of conda environment, especially when dealing with large package repositories such as conda-forge.

Mamba has been adopted by major projects such as conda-forge, bioconda, Jupyter's, and is used in large corporate settings.

Beyong mamba, we are also responsible for the Quetz project, an open-source hosting service for conda packages.


We are the creators of Voilà, which can transform Jupyter notebooks into standalone web applications and dashboards.

Voilà has been incorporated as a Jupyter subproject.


The QuantStack team started the Xeus framework, a reference implementation of the Jupyter kernel protocol in C++, and several Jupyter kernels, such as xeus-cling, a C++ Jupyter kernel, xeus-python, a Python Jupyter kernel, and xeus-robot a kernel for Robotframework.

Xeus is now officially part of the Jupyter project.


The RoboStack initiative aims at bringing together the PyData, Jupyter, and ROS stacks, into a unified toolkit, including a rich ROS and Jupyter integration and the packaging of ROS packages with conda.