I develop a shopping list app, which supports multiple lists, but only one list can be viewed at once.
The "Lists" button (top-left) is used to open a screen showing all lists and, from here, a new list can be selected.
Lists can be shared with other users.
When someone makes a change to the active list, it is updated immediately. But if a user changes one of the non-active lists, there is no indication that a change occurred.
I was considering using a circular bullet character to signify that changes were available, like this:
My thinking was it would be similar to the blue circle to the left of unread mail.
Does this approach make sense or is there a more idiomatic way of indicating a change using the iOS button?
Update Monday, 8 May 2023 Many thanks for all the suggestions.
In the end, I went with a small dot indicator next to the "Lists" button:
This is intended to be reminiscent of notifications used in other apps.
In Twitter, a dot is placed next to the Home icon when new posts have arrived:
App Icons often change to include a badge when notifications are present:
StackOverflow does this too:
After downloading a file from mobile Safari, the Downloads icon changes to include a small dot:
And when an iOS app is installed from TestFlight, a small dot is placed before the app name: