Clock is an easy to use Virtual Private Network (VPN) for Apple OS X and iOS only.
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Pro Unlimited devices (as long as they're OSX/iOS)
Unlimited devices and data per account, so you can connect up the whole family or office on one account if you so choose.
Pro Senses Trusted WiFi networks
Cloak can be set to not use the VPN on whitelisted WiFI SSIDs (like home/work).
Pro Responsive developer
The developer of Cloak is extremely responsive to feedback and quick to answer questions or support requests.
Pro Does SSL Pinning on OS X
SSL pinning protects against some forms of man-in-the-middle attacks that even SSL encrypted traffic is vulnerable to. Not long ago, iOS did not allow for pinning but that may have changed more recently.