MathCell is free and open source, and the code is available on GitHub. You can download the complete library to your web server and include it in the body of a page with a script tag:

<script src="mathcell.js"></script>

If you do not want to download the source file, you can link to the most current version from this website,

<script src="https://paulmasson.github.io/mathcell/build/mathcell.js"></script>

or a past stable version from an online content delivery network:

<script src="https://cdn.jsdelivr.net/gh/paulmasson/mathcell@1.7.0/build/mathcell.js"></script>

The number in the link should be adjusted for the desired version.

The default documentation is always for the most current version of the code. Older versions of the documentation can be accessed through a link like this,

https://raw.githack.com/paulmasson/mathcell/1.3.0/docs/

where the number in the link corresponds to the desired version.