Optinmonster Optin Monster hides information about the price of their products Miame Miami 

I applied for a discount offered by the company to have the Growth Plan for $39,60. I checked in every place looking for the terms "first month only" or "first something" and did not find anything. And next month comes the billing charging $99!  I got in contact with support and they sent me the bible with Term & Conditions, where you spent a good time reading and then it appears the term  "first month only for discounts".

They induce the consumer to belive that when you buy for the first time it's going to last that price. When you see the final price, etchically it shoul apper a "?" or (*) where indicates more info about the price, if it's going to change further. But there is no message, no sentence, no gray words, anything that says that you're gonna pay more than the double of the price next month. 

So people, becareful with OptinMonster, try others to help you with your optin strategy!