I think there are two valid interpretations of the words “local-first”.

1) The outcome of all interactions can be seen locally first, but are sent to a server too. Optimistic updates on steroids, largely done to make software seem faster. Linear is the notable example.

2) The app is built so that it’s fully functional and useful without any kind of internet connectivity. But if network _is_ available, there are some augmented capabilities. Think note-taking apps like the one built into MacOS and iOS, or Bear