Cryptocat is a chat client that features encryption using Off-The-Record (OTR) encryption. This means that both ends have to be online at the same time to do secure negotiation, after which messages can be exchanged. So it is not really a WhatsApp alternative, although it does feature encryption.
The encryption techniques of Cryptocat has been under fire before. Last year we saw a scathing post describing how broken the Cryptocat encryption was and that any chats exchanged before that time were completely vulnerable. The designers of Cryptocat fixed things, but they did not think this was a very big deal.
I called the Cryptocat monitor a marketing tool, the team claims to use it to detect censorships events. But with this vague way of doing statistics I fail to see how you could actually detect something like that. The Tor monitor shows a graph of total connections (per country), which is much easier to interpret and to follow.