Feature Kindle Kindle Touch Kindle Keyboard Kindle DX Kindle Fire Nook Simple Touch Nook Color Nook Tablet iPad 2 Battery Life 1 month with wireless off and half-hour of daily reading 2 months with wireless off and half-hour of daily reading 2 months with wireless off and half-hour of daily reading 3 weeks with wireless off 8 hours continuous reading or 7.5 hours video playback Up to 2 months with wireless off and half-hour of daily reading Up to 8 hours with wireless off and half-hour of daily reading Up to 11.5 hours of reading or 9 hours video playback with half-hour of daily reading Up to 10 hours on wireless or up to 9 hours on 3G data network Built-in Dictionary - - - - - Merriam-Webster's Collegiate Dictionary Merriam-Webster's Collegiate Dictionary Merriam-Webster's Collegiate Dictionary - Camera - Back No No No No No No No No Yes Camera - Front No No No No No No No No Yes Connectivity Wi-Fi Free 3G + Wi-Fi Free 3G + Wi-Fi Free 3G Wi-Fi Wi-Fi Wi-Fi WiFi Wi-Fi + 3G Dimensions 6.5"x4.5"x0.34" 6.8"x4.7"x0.40" 7.5"x4.8"x0.34" 10.4"x7.2"x0.38" 7.5"x4.7"x0.45" 6.5"x5.0"x0.47" 8.1"x5.0"x0.48" 8.1"x5.0"x0.48" 9.5"x7.3"x0.34" Display Color No No No No Yes No Yes Yes Yes Display Resolution 800 x 600 167 ppi 800 x 600 167 ppi 800 x 600 167 ppi 1200 x 824 150 ppi 1024 x 600 169 ppi 800 x 600 167 ppi 1024 x 600 169 ppi 1024 x 600 169 ppi 1024 x 768 132 ppi Display Size 6" E Ink Pearl 6" E Ink Pearl 6" E Ink Pearl 9.7" E Ink Pearl 7" Vibrant Color IPS 6" E Ink Pearl 7" VividView Color 7" VividView Color 9.7" LED-backlit glossy Interface 5-way controller Multi-touch Keyboard Keyboard Multi-touch Touchscreen Touchscreen Touchscreen Multi-touch Operating System Linux OS Linux OS Linux OS Linux OS Android OS Android OS Android OS Android OS iOS 5 Price $79 - $109 $99 - $189 $139 - $189 $379 $199 $99 $199 $249 $499 - $829 Processor - - - - 1 GHz Dual Core 600 MHz Single Core 800 MHz Single Core 1 GHz Dual Core 1 GHz Dual Core RAM - - 256 MB 125 MB 512 MB 256 MB 512 MB 1 GB 512 MB Storage - Internal 2 GB 4 GB 4 GB 4 GB 8 GB 2 GB 8 GB 16 GB 16 GB - 64 GB Storage - External Cloud Storage Cloud Storage Cloud Storage Cloud Storage Cloud Storage Up to 32GB microSD Up to 32GB microSD Up to 32GB microSD iCloud Web Experimental browser Experimental browser Experimental browser Experimental browser Amazon Silk cloud-accelerated browser None Enhanced web browser with Adobe Flash Player Enhanced web browser with Adobe Flash Player Safari Weight 5.98 oz 7.5 oz - 7.8 oz 8.5 oz - 8.7 oz 18.9 oz 14.6 oz 7.5 oz 15.8 oz 14.1 oz 17.3 oz