@jorge
A word of warning for the privacy conscious:
"Mathpix’s optical character recognition technology is being used by a number of companies like WolframAlpha, Microsoft, Google, etc. to improve their tools’ image recognition capability while dealing with math symbols."
A word of warning from a seasoned writer of LaTeX:
Trying to make one small change to someone else's LaTeX rendering of an equation can be very difficult. It's easier if you wrote the LaTeX yourself. So, it's worth learning.