( CNN ) -- Popular apps for the iPhone and iPad , some of which usually go for up to $ 20 , were being offered for free in Apple 's online App Store on Monday , possibly in conjunction with the store 's fifth anniversary . Popular games were in abundance on the list , with `` Infinity Blade II , '' `` Where 's My Water ? '' and `` Tiny Wings '' among them . The steepest discount appeared to be Traktor DJ , a suite of tools for mixing and recording music that usually goes for $ 19.99 . MapMyRide+ , photo-text app Over and recipe app How to Cook Everything also were among the apps being offered for free Monday . Apple did not immediately respond to a request for more information about the free apps . In May , the App Store passed a staggering 50 billion downloads , according to Apple . It seems likely that the apparent promotion will be part of an effort to commemorate July 10 , 2008 , the day the App Store went live as an update to iTunes . It increased the appeal of the iPhone , and later the iPad , and created a sales model that has been adopted by rivals like Google , Microsoft and BlackBerry in the years since . That 's led to Apple to trademark the term `` app store '' in an ongoing effort to protect the term . In 2011 , Apple filed a lawsuit against Amazon , which rolled out the Amazon App Store along with its entry into the tablet market with the Kindle Fire . Last month , the two companies failed to come to an agreement after new rounds of negotiations . Apple argues that Amazon infringes on its trademark by calling its store that sells apps an `` app store . '' Amazon argues that the words constitute a generic description . The term `` app , '' as applied to computers , dates at least to the 1980s . Google 's app store , for users of its mobile Android operating system , is called Google Play . BlackBerry has BlackBerry World , and Microsoft 's merely says `` Windows Phone '' at the top of its mobile store 's homepage .
Top Apple App Store 's , iPad apps being offered for free . Change comes as iPhone the 1980s anniversary approaches . Games like `` Infinity Blade II , '' tools like ` ` Where 's My Water on list . Priciest freebie is the normally $ up to $ 20 Traktor DJ .