KeePass concern. Keepass copies the username and password to the clipboard  where it is then deleted after a few seconds. But Clipstack copies the clipboard thus providing a security problem. Clipstack can't do anything about it and that's fine but I wish there was a toggle in the notification so I can easily turn it on and off  still being able to copy text from it though. Unfortunately there is no notification unless the service is on  making it tedious to switch it on and off. Still  a very well designed and useful app.
October 15 2015