Introducing a webApp which allows you to create block diagrams with text and have control over the blocks/arrows positions without drag and drop.
Examples : https://blockdiagram.herokuapp.com/examples
Thanks for asking this!
The main difference is that, it provides ability to structure the arrows(and hence layout of the diagram) with just single characters as per direction required. In other tools either the arrow direction(and hence layout) is auto-decided by tool, or difficult to change as you want(atleast thats my understanding, please let me know if its wrong). Also, this tool is not as extensive in current form when compared to others.
Examples might help clarify the point : https://blockdiagram.herokuapp.com/examples
Probably because spinner/loader is currently not present, it might look like nothing changed, since updates to the diagram are async. I will put a spinner in place, but change actually happens, if you change the text. Also let me know what was the change, i can check if there was error.