I just purchased the device and I love it.
I have an issue with the macOS version of the app.
Some letters trigger system dialogs. For example, typing my user name that contains a “d” triggers the dictation dialog and so other few letters. If I copy the triggering letters from anywhere else and paste them into the lines app, the issue doesn’t occur.
It makes the use of the app very impractical…
I am in the US and my mac is set to US English locale (no other international keyboards are installed)