I would like to have a real time latex renderer, so I can make a youtube video with a screen recorder and a mic, teaching how to solve a math problem, while I type latex, and the screen shows both my latex code and the rendered math in real time while I speak.
I know of Bakoma Tex, it would be the ideal solution, but it is not free and I can't afford it at the time.
The latex rendering from math.stackexchange would fit perfect for my needs. But I would like to modify the presentation: I would like to make the textarea bigger so that more can be seen at a glance.
The live demo in https://www.mathjax.org/#demo is also almost perfect, but it doesn't make a newline when I press enter.
I modified the example https://docs.mathjax.org/en/v1.0/typeset.html so that the input is a textarea, and the event is onkeyup so that it updates on every key press instead of waiting for me to press enter to render. But it kind of "blanks" the preview for a second before every keypress. And it only works in mathmode, so I can't type inline math.
What suggestions do you have to render latex real time for free like this? I would prefer an offline solution, but in principle could use an online solution too. Is this even possible?
PD: Sorry if this isn't the place to post a request like this.