Coomeet is definitely not free. Even on the front page it says you only get five minutes of free conversation.
You also have to register before that brief trial period begins.
Now it's true the male to female ration is better on Coomeet, than most other sites. But I suspect that's because the cam girls are paid here, and unfortunately for most guys, they don't have to do anything sexual just to get paid.
You can chat with people all over the world, get live video audio chat in HD, flirty chat, private conversations, but no sex as far as I can tell.
But it has about 9 million users, so it's fairly popular and might be worth if you like chatting with random people.