When comparing Cloak vs VPN.ac, the Slant community recommends Cloak for most people. In the question“What is the best VPN provider? ” Cloak is ranked 25th while VPN.ac is ranked 26th. The most important reason people chose Cloak is:
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.
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Pros
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.
Pro Responsive developer
The developer of Cloak is extremely responsive to feedback and quick to answer questions or support requests.
Pro Senses Trusted WiFi networks
Cloak can be set to not use the VPN on whitelisted WiFI SSIDs (like home/work).
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 Fast
VPN.ac has fast throughput rates.
Pro Solid encryption
Pro Six simultaneous connections
Up to six devices can be connected to the service in parallel with one account.
Pro Great support
Very quick and professional support and easy to use ticketing system.
Pro Optional double hop server for advanced anonymity
Pro Outside "Five Eyes"
Based in Romania* the service is outside of the jurisdiction of Five Eyes.
*http://nomadcapitalist.com/2013/12/15/top-5-best-countries-host-website-data-privacy/
Pro Easy to use
Especially the mobile client is very user friendly. The upcoming version of the desktop client is following suite regarding UI.