Create APP Developer Site

Get-SPServiceInstance | where{$_.GetType().Name -eq "AppManagementServiceInstance" -or $_.GetType().Name -eq "SPSubscriptionSettingsServiceInstance"}


  $account = Get-SPManagedAccount "Eli\spsvc"


  $appPoolSubSvc = New-SPServiceApplicationPool -Name SettingsServiceAppPool -Account $account
  $appPoolAppSvc = New-SPServiceApplicationPool -Name AppServiceAppPool -Account $account


  $appSubSvc = New-SPSubscriptionSettingsServiceApplication –ApplicationPool $appPoolSubSvc –Name SettingsServiceApp –DatabaseName SettingsServiceDB
  $proxySubSvc = New-SPSubscriptionSettingsServiceApplicationProxy –ServiceApplication $appSubSvc

  $appAppSvc = New-SPAppManagementServiceApplication –ApplicationPool $appPoolAppSvc –Name AppServiceApp –DatabaseName AppServiceDB
  $proxyAppSvc = New-SPAppManagementServiceApplicationProxy –ServiceApplication $appAppSvc



Set-SPAppSiteSubscriptionName -Name "app" -Confirm:$false