What software tools, if any, which can count the number of syllables on each line, to aid in the writing of English-language poetry? What features and pros and cons exist for each?
This is not something strange. Almost every programming language can analyze text to capture such data. It will be a one-file script. Here is some online applications:
Since the process is simple and straightforward, the features are not very different; just analyzing the text. There should be lots of (simple) desktop softwares too.
This software exists. It is available for macOS and iOS. It is called Lyrcs. The website to learn more is https://lyrcs.app/
Some of the features are:
- syllable counting
- rhyme highlighting
- rhyme dictionary
A con would be it is not available for windows.