MatTalX is a free Chrome add-on developed by samleb17 that allows users to write mathematical expressions anywhere. With this add-on, you can easily convert LaTeX commands to plain text and paste them on any platform.

Whether you want to discuss physics, mathematics, chemistry, or even chess with your friends, MatTalX has you covered. It offers more than 1000 commands, and you can even create your own. The commands are easy to remember, especially if you are already familiar with LaTeX. If not, you can simply open the completion popup to access the commands.

To use MatTalX, simply copy and paste a LaTeX command like "H(t) | \psi (t) \rangle = i \hbar \frac{\partial}{\partial t}| \psi (t) \rangle" into the upper square and click "Convert." The add-on will then generate the plain text equivalent.

MatTalX is a simple, free, and open-source tool that makes it easy to write math symbols and equations on any platform. It also provides comprehensive documentation that can be accessed by hovering your mouse over the question mark (?) on the top right corner of the popup.