https://article2audio.app/ is my creation. It's a BMW of article readers -- it handles images, tables, preformatted text, and many other nuances of a Web page. I built it to scratch my own itch. I invite you to a free trial.

This app can be useful for listeners who want to enjoy articles while driving, in a gym, etc., and for website owners who want to offer an audio version of their articles.

If you want to create sequence diagrams from text that are much more presentable than what you get in Mermaid, check out app.colibridiagrams.net.

This app may not have all the diagramming syntax Mermaid or sequencediagram.org has, but should be enough for 99% cases.