Here is a list of K and 1st grade level apps that can be used to differentiate, re-enforce and scaffold learning.
Free iPad app: https://itunes.apple.com/us/app/pirate-ph.d./id457197421?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/pirate-ph.d.-full-edition/id467479434?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.brainpop.brainpopfeaturedmovieandroid
Google Apps for Education app: https://www.google.com/enterprise/marketplace/viewListing?productListingId=8006+9291735389906767602
Free iPad app: http://itunes.apple.com/us/app/brainpop-featured-movie/id364894352?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/brainpop-featured-movie/id364894352?mt=8&uo=4&at=10l6SU
Website: http://www.brainpop.com/
Google Chrome app: https://chrome.google.com/webstore/detail/brainpop-featured-movie/cdikkckjinnmjpgkjjpnfmmbcpbhmklf
Free iPad app: https://itunes.apple.com/us/app/virtual-city-playground-hd/id447763975?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/virtual-city-playground/id447763775?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.g5e.virtualcitysb
Free Mac program: https://itunes.apple.com/us/app/virtual-city-playground/id479527329?mt=12&uo=4&at=10l6SU
Free iPad app: http://itunes.apple.com/us/app/puppet-pals-hd/id342076546?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/daisy-the-dinosaur/id490514278?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/pic-collage/id448639966?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/pic-collage/id448639966?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.cardinalblue.piccollage.google
Free iPad app: https://itunes.apple.com/us/app/everything-butt-art-kids-learn/id468989046?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/sticker-world/id542200948?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/sticker-world/id542200948?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/subtracting-sardines-hd/id468674475?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/subtracting-sardines/id468674886?mt=8&uo=4&at=10l6SU
Paid Mac program: https://itunes.apple.com/us/app/subtracting-sardines/id468673688?mt=12&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/motion-math-hd/id410521340?mt=8&uo=4&at=10l6SU
Paid iPhone app: http://itunes.apple.com/us/app/motion-math/id392489333?mt=8&uo=4&at=10l6SU
Edmodo app: http://www.edmodo.com/publisher/motionmath
Paid iPad app: https://itunes.apple.com/us/app/motion-math-hungry-guppy/id542563075?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/motion-math-hungry-guppy/id542563075?mt=8&uo=4&at=10l6SU
Free iPad app: http://itunes.apple.com/us/app/motion-math-zoom/id451793073?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/motion-math-zoom/id451793073?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/geoboard-by-math-learning/id519896952?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/geoboard-by-math-learning/id519896952?mt=8&uo=4&at=10l6SU
Website: http://www.mathlearningcenter.org/web-apps/geoboard/
Google Chrome app: https://chrome.google.com/webstore/detail/geoboard-by-the-math-lear/gaakmmdiopnmcenkojohldanladpajak
Paid iPhone app: https://itunes.apple.com/us/app/sums-stacker/id343251346?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/money-math-counting-coins/id663456334?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/wheres-my-water-free/id467810884?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/wheres-my-water/id449735650?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/wheres-my-water-free/id467810884?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/wheres-my-water/id449735650?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.disney.WMWLite
Paid Android Phone app: https://play.google.com/store/apps/details?id=com.disney.WMW
Free iPad app: https://itunes.apple.com/us/app/google-earth/id293622097?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/google-earth/id293622097?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.google.earth
Free Mac program: http://www.google.com/earth/download/
Free Windows program: http://www.google.com/earth/download/
Google Chrome app: http://www.google.com/earth/explore/products/plugin.html
Mozilla Firefox extension: http://www.google.com/earth/explore/products/plugin.html
Apple Safari extension: http://www.google.com/earth/explore/products/plugin.html
Paid iPad app: http://itunes.apple.com/app/barefoot-world-atlas/id489221652?ls=1&mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/app/futaba-classroom-games-for/id487979995?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/abcmouse-com-zoo-set-1/id376049077?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/abcmouse-com-zoo-set-1/id376049077?mt=8&uo=4&at=10l6SU
Free Mac program: https://itunes.apple.com/us/app/abcmouse.com-zoo-set-1/id594776319?mt=12&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/beginning-sounds-interactive/id465479183?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/beginning-sounds-interactive/id465479183?mt=8&uo=4&at=10l6SU
Paid Mac program: http://www.lakeshorelearning.com/product/productDet.jsp?productItemID=1%2C689%2C949%2C371%2C923%2C658&ASSORTMENT%3C%3East_id=1408474395181113&bmUID=1373447904624
Paid Windows program: http://www.lakeshorelearning.com/product/productDet.jsp?productItemID=1%2C689%2C949%2C371%2C923%2C658&ASSORTMENT%3C%3East_id=1408474395181113&bmUID=1373447904624
Paid iPad app: https://itunes.apple.com/us/app/id512507120?mt=8&uo=4&at=10l6SU
Paid Android Phone app: https://play.google.com/store/apps/details?id=com.abitalk.sentencesbuilder
Free iPad app: https://itunes.apple.com/us/app/phonics-fun-1/id459016092?mt=8&uo=4&at=10l6SU
Paid iPad app: http://itunes.apple.com/us/app/comic-life/id432537882?mt=8&uo=4&at=10l6SU
Paid iPhone app: http://itunes.apple.com/us/app/comic-life/id432537882?mt=8&uo=4&at=10l6SU
Paid Mac program: http://itunes.apple.com/us/app/comic-life-2/id402508085?mt=12&uo=4&at=10l6SU