Although this is a fairly new plugin, I’ve already used RapID on three WP sites that I manage and found it really good so far. It works well with the app to let me have a single logon to all three sites, including more than one account on the same site.
It was easy to set up and use as a site admin (it took a couple of minutes) and even easier for my co-administrators and subscribers.
I like that I can logon at any computer just by scanning the screen with my phone, so I don’t have to enter my username of password at all. It even works from the browser on the phone itself by touching the barcode.
Thanks!