Before entering any sensitive information onto a site, Siciliano says consumers should understand each site's policies in the event there is a breach.

"It's important to know who ultimately is responsible for any security failures and what their policy for retribution is," he said.

On Mint, you never share your name or Social Security number. Also, there is an option that will send a text message if there is an expensive purchase made on your credit card.

"If anything, Mint will help you keep an eye on suspicious activity," Patzer said.

Patzer said that even in the event your account is accessed by someone else, the amount of damage they could inflict is minimal.

"You can't move money from account to account on Mint, so they wouldn't be able to do much," Patzer said.

Siciliano said financial sites -- whether they are free or not -- are required to have the software and encryption methods to protect users.

"As a consumer, I would try my best to understand their revenue model and how they are paying for all that security," he said.

Free And Accessible

Besides being free, Patzer said, the best thing about his site, "is that allows you set a budget.