iText for Apple Watch
iText was an iOS app that uploaded a written text from an iPhone to its Apple Watch.
Every part of it was offline; the user could choose between three different sections to put text in; once the String was uploaded on the Apple Watch, the notes could be accessed everywhere even when the phone was turned off. A new feature was added in the latest releases: the emergency button.
If you were reading your notes and someone tried to spy on them, you could easily just press the emergency button and a (customizable) Watch Face was shown on the screen to prevent everyone from reading your private notes.
This app has been on the App Store from 2015 to June 2020.
Some italian Apple blogs reposted iText for their readers, here are some: