UnInstall App from sharepoint 2013

You can do it from UI by :
Site content --> click on ... of aqpp and you will see remove . click on remove and it should work .
If it says refresh page and try again  try it and if you are still not able to do it just try powershell command below it will do the magic for you .

from powershell:
$instances = Get-SPAppInstance -Web http:/sharepointsite:1234/sites/test1
$instance = $instances | where {$_.Title -eq 'App1'}
Uninstall-SPAppInstance -Identity $instance

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