Howm is a minor mode, and can be used with any text format that Emacs supports. Whether it’s useful to combine them is another question, I guess it depends on

Howm is a minor mode, and can be used with any text format that Emacs supports. Whether it’s useful to combine them is another question, I guess it depends on whether you use TeXinfo for notes or documents? I thought TeXinfo is mostly used for documentation, in which case I’d find it more natural to bundle it with the software project it documents.