This app was permanently removed on 16 August 2018 due to Twitter changing their API and because they are now preventing access to direct messages older than 30 days.
I won't be rebuilding this app. Twitter have made it clear that third parties should not attempt to fill gaps in the Twitter service and will be continually hampered if they try to do so. This is the last of my Twitter apps to close down and I won't be developing any more in future.
I am not storing any data belonging to Twitter users, but it's always good practice to revoke permissions from apps you've used in the past.
Thanks to everyone who tweeted nice things about this app over the years.