mini tablet comparison: Google versus Amazon versus Apple

Nexus 7 Home (Photo credit: Stmpjmpr)

I've just done a little table to compare the Nexus 7, Kindle Fire and iPad mini which I thought I would share. 

Off course, it is not all about the specs, it is also about the look and feel of the mini-tablet and mainly about the ecosystem that you want to buy into: Google versus Amazon versus Apple.
I feel that these ecosystems are getting increasingly incompatible with one another and changing from one ecosystem to another can be painful and requires a lot of adaptation.

	Nexus 7	Kindel Fire	iPad mini
Screen Ppi (pixel per inch)	7" 1280x800 HD display at 216 ppi	7" multi-touch,  1024x600 resolution at 169 ppi or 1280x800 resolution for the HD option	7.9" multi-touch, 1024x768 resolution at 163 ppi
Front facing camera	1.2MP front-facing camera		1.2MP FaceTime HD camera
Weight in grams	340g	400g	308g 312 (wifi + cellular)
Memory	1 GB RAM	512MB	512 MB (???)
Battery	4325 mAh (Up to 8 hours of active use)	Up to 9 hours of reading, surfing the web on Wi-Fi, watching video, or listening to music.	Up to 10 hours of surfing the web on Wi-Fi, watching video or listening to music
CPU	Quad-core Tegra 3 processor	1GHz dual-core processor	Dual-core A5 but see here for full benchmarking
Size in mm	198.5 x 120 x 10.45	189 x 120 x 11.5	200 x 134.7 x 7.2
Wireless	WiFi 802.11 b/g/n + Bluetooth	Wi-Fi (802.11a/b/g/n); does not support connecting to ad-hoc (or peer-to-peer) Wi-Fi networks	Wi-Fi (802.11a/b/g/n; 802.11n on 2.4GHz and 5GHz) Bluetooth 4.0 technology
Connection	Micro USB	USB 2.0 (micro-B connector) port for connection to a PC or Macintosh computer or to connect to the Kindle PowerFast charging accessory	Ligthning conector
OS	Android 4.1 (Jelly Bean)	Android 2.3 Gingerbread OS	iOS6
Features	Microphone NFC (Android Beam) Accelerometer GPS Magnetometer Gyroscope	3.5 mm stereo jack and integrated stereo speakers	720p HD video FaceTime video calling over Wi-Fi or a mobile network3 Face detection Backside illumination iSight camera  5MP photos Autofocus Face detection Backside illumination Five-element lens Hybrid IR filter ƒ/2.4 aperture Siri - Use your voice to send messages, set reminders and more.
Price	£199 for 16GB and £159 for 6Gb	8 GB internal memory, approximately 5.5GB available for user content £129 or £169 for Fire HD with 16 GB or £209 32 GB on device	Wi-Fi 16GB £269 32GB £349 64GB £429 Wi-Fi + Cellular 16GB £369 32GB £449 64GB £529