TypeIt4Me has a chart comparing the features of their software vs. two other popular abbreviation-to-full-word-or-phrase applications, Typinator (which I currently use), and TextExpander.
The main shortcoming on Typinator and TextExpander is that they don’t allow for variable input.
Let’s say I want a phrase that says:
“Hey nnn, thanks for the query. Don’t worry about it, ok nnn?”
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Comparison of text expander software for the Mac