Mathcha – Online Mathematics Editor

The editor is great and you can export to LaTeX, which is the single most important feature for me.

I would gladly have dropped ~30$ on the offline version, but that only pays for a year of subsciption - so that‘s a no from me. I‘m just using the new Word formula editor or pure Latex instead.

What is the best open-source equivalent of this?

TeXmacs does not run in the browser.