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2023-04-26 test story
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Testing CoCalc

by Sagemath, Inc.

Improve your research, teaching, and publishing using realtime collaborative Jupyter notebooks, LaTeX, Markdown, and Linux.

Mission: Enable better collaboration in science, engineering and mathematics by providing easily accessible and sustainable tools for computing, teaching, and publishing.

Dedicated Compute Servers with GPU support new

Infographic showing how you connect from CoCalc to other machines for various tasks.
Extend your TestCalc projects with powerful compute servers. They give you much more power, GPU support, and flexibility for your computations.
From within your TestCalc project, spin up and connect to a powerful machine. You simply tell your terminals and Jupyter Notebooks to run on these machines. These compute servers open up new possibilities by utilizing enhanced computing resources, extending far beyond the bounds of what you can do in your local project.
These machines optionally come with GPU support. The pre-configured software environments make it very easy to make use of them, right out of the box. These software environments include SageMath, Google Colab, Julia, PyTorch, Tensorflow and CUDA Toolkit, accommodating a versatile range of applications.
Your files are synchronized on demand. Therefore, you can almost seamlessly switch between local and remote computing. You also have much more temporary storage right there on the remote machine.
Usage of these machines is billed by the second. The pricing is highly competitive, starting at under $0.15/hour for computer servers with a GPU!

LLMs are here to help you

TestCalc's file editors are enhanced by large language models like ChatGPT. They help you fixing errors, generate code or LaTeX snippets, summarize documents, and much more.

Many Programming Languages

print('Welcome to CoCalc from Sage!', factor(2023))
TestCalc supports many programming languages. Edit the demo cell on the left and evaluate it by pressing "Run". You can also select a different "kernel", i.e. the programming language that is used to evaluate the cell.

Collaborative Computational Documents

Two browser windows editing the same Jupyter notebook
TestCalc makes it possible to collaboratively edit computational documents with your colleagues, students, or friends. Edit Jupyter Notebooks, LaTeX files, SageMath Worksheets, Computational Whiteboards and many more with your collaborators in a real-time.
The code code runs in the same environment for everyone, giving consistent results. All changes are synchronized in real-time.
Therefore, you can forget the frustration of sending files back and forth between your collaborators. You no longer waste time reviewing changes and merging documents.

Available Tools

Jupyter logo

Jupyter Notebooks

CoCalc's own Jupyter Notebook implementation offers realtime synchronization, TimeTravel, automatic grading, side chat, and more.
SageMath sticker logo

Sage Worksheets

Sage Worksheets are similar to Jupyter Notebooks, but made to work well with SageMath. They offer a single-document model that scales to large documents and integrated 3d graphics.
LaTeX Logo

LaTeX\LaTeX Editor

A full LaTeX\LaTeXeditor supporting preview rendering, forward/inverse search, error reporting, and much more.
Tux Linux Penguin

Linux Terminal

The very sophisticated collaborative Linux Terminal makes you incredibly productive. Many programming languages and hundreds of tools are available at your fingertips in a full Ubuntu Linux environment.

Teach a Course

Two browser windows editing the same Jupyter notebook
You can think of TestCalc as virtual computer lab in the cloud. It takes away the pain of teaching scientific software.
Hassle-free assignments: TestCalc keeps all files well organized! Due to real-time synchronization you never have to deal with multiple versions of the same file. There is even support for automated grading via NBGrader.
Pre-installed Software like in a computer lab, all software you need is already installed and ready to use.
Real-time Collaboration allows you to virtually look students over their shoulders. You can check their work directly and help them by editing the file or using side-chat communication.

And much more …

Available Software

TestCalc comes with a variety of software pre-installed, e.g. Python, SageMath and Octave. You can install additional software directly in your project as well.

Computational Whiteboard

Use a full featured collaborative whiteboard – with support for computational elements – to express and share your ideas.

Features Overview

TestCalc offers a variety of features to make your life easier. You can find a list of all features here.

Offered Solutions

Online Service

You can start using TestCalc online for free today. Create an account, open your trial project and start exploring TestCalc.
Upgrade your projects at any time, to unlock internet access, better hosting quality, and other upgrades by purchasing a site license or upgrade via pay-as-you-go.

Teach a Course

You can teach a course on TestCalc online!
The course license options are very flexible: they range from small professional training up to large university courses.


It is possible to run TestCalc on your own infrastructure.
There are two options available: an easy to setup single-server variant for a small working group and a highly scalable variant for a Kubernetes cluster.