Copying credentials from web app version is too difficult on mobile devices
Copying credentials from the mobile web app version of Passcards is too difficult on mobile devices as it is fiddly to select the contents of a field directly, once it has been revealed.
The text is also too small if visually copying the contents of a field, eg. if a user is using their phone to view account details in order to login on another system which can't currently run any version of Passcards (eg. a public terminal with an old IE version for example).
Recent versions of Chrome and Firefox allow the system to programatically invoke document.execCommand('copy') in response to a user gesture. This would enabling tapping the Copy button to work.
This will hopefully cover Android in future. If Safari doesn't already support this then we could perhaps ask them to do the same thing.
The big plan B is to develop a native UI using React Native :)
Copying to the clipboard has been re-implemented to use document.execCommand('copy') which means that at least the Copy button works now.