Security firm Bitdefender recently launched Clueful, an iOS app that, for $3.99, identifies other apps on your iPhone that may be tracking your location, reading your address book, delivering ads, tracking your usage, accessing your Facebook, Twitter or Google accounts, and more.

"It’s not all fire and brimstone, though," writes Wired's Christina Bonnington. "The app also reveals 'Things you might appreciate' for each app, such as information on whether it uses an anonymous identifier or encrypts stored data (Foodspotting, for instance, does both of these things). It can be surprising to learn which apps do and don’t have solid security practices, and which apps are quietly tracking usage information for advertising purposes -- something most apps do not openly reveal when you download them."

"I’ve got an embarrassing number of apps on my phone, but after installing and running Clueful, it still managed to surprise me. (Solitaire was accessing my address book? What?)," writes TechCrunch's Sarah Perez. "But the news wasn’t all bad -- most of my apps were behaving. Clueful nicely differentiates between apps that 'can' do something (like access your address book) versus those that 'could' do something (like track your location)."

"Your iPhone is probably the most personal device you own, holding vast amounts of information about what you do, who you are, and where you go," Bitdefender chief security researcher Alexandru Catalin Cosoi said in a statement. "Clueful tells you what kinds of private information apps can access so you can make an informed decision whether to use that app."