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Pros
Pro Just right
Not too thin, not too bloat. Very approachable.
Pro No subscription
TypeIt4Me is relatively inexpensive. There's a $19.99 one-off payment and that's it. No recurring monthly fee after that (though they do charge an optional $8.99 fee to upgrade to a new version every few years).
Pro Relatively easy to use
Other text expanders do the job but are really difficult to use, with complicated interfaces to learn. By contrast, TypeIt4Me is relatively simple and intuitive. It also has a detailed instruction manual for when you do want to get into the power features.
Pro Has been actively developed for decades
The developer has been supporting TypeIt4Me since the 1990s and clearly cares about maintaining the product.
Pro Good support
First class customer care.
Pro Related notepad app for iPhone and iPad
The Mac version of TypeIt4Me can sync snippets via iCloud with TypeIt4Me Touch (an iOS note-taking app with built-in TypeIt4Me text expansion support, available as a separate purchase).
Cons
Con Less sophisticated feature set
If you're switching from TextExpander you may miss one or two power features like fill-ins that don't have direct equivalents. There's usually a workaround that achieves roughly the same outcome, though.
Con Infrequent updates
It's a great app but there tend to be quite long intervals between major new versions.
Con Language support
The TypeIt4Me app interface itself is available in English, French, Italian, German and Spanish but the Help / instructions are only available in English. If your English is not strong, this could be frustrating.