Turn any article into a diagram
Some ideas are easier to see than to read. Ask Gloss to "draw a diagram of this" and it draws one into the article, next to the text it explains.
Diagrams are made for the page in front of you, from what it actually says, and they are saved with the page.
Add Gloss to Chrome
Gloss is a Chrome extension. Reading presets are free and need no account. Type a request in your own words, or turn on voice in Settings.