1. BillGuard. The BillGuard app, using bank-level security, pulls all your transactions from various accounts, and flags ones that might be erroneous, including duplicate charges that have been flagged by other users. You can flag a charge and dispute it with a company directly through the app. When a retailer faces a data breach, BillGuard alerts you if you shopped at the store during the period of the incident. continue reading » BillGuard is one of several apps to hit the market recently with the goal of protecting your finances and saving you money. Other popular ones reduce your parking expenses, help you track spending and help you find discounts and coupons. Here’s an overview of some of the most popular apps, which are all available for both iOS and Android, and how they work: ShareShareSharePrintMailGooglePinterestDiggRedditStumbleuponDeliciousBufferTumblr Stay on top of your spending by downloading these apps.by: Kimberly PalmerSeveral years ago, entrepreneur Yaron Samid noticed a fraudulent charge on his credit card. When he investigated, he found that it had actually been a recurring charge, added to his monthly bill, that he had been paying without even realizing it. He also discovered that other people posted online about the same charge, and he wasn’t the first person to be surprised by it.His tech background inspired him to start thinking about how people could share information about such fraudulent charges to help protect each other. That concept led him to create BillGuard, an app that has been used by more than 1 million people worldwide since it launched in July 2013. “The [app] is helping people make sure they’re only paying for what they should be,” says BillGuard spokeswoman Marina Boykis.