A few days ago I saw someone ask for a tool that would allow to do the following, format the text to bold of just a few letters of each word to improve concentration/reading fluency. I made this application ePubFlow directly in the browser where you can convert any epub file with the desired settings.
FYI... I'm working on the same application but as a plugin for Calibre.... I will inform you when it is ready.
u/Fit_Discipline — 16 days ago