1. I viewed the videos for each of the five platforms and found that there were two points that became very obvious, 1) why has no one in my board done this ( quickly followed by the realization that they may have and I would not know)
2. 2) I wish there was voice description as well, it was a little difficult to follow the apparently random selections and the music and simple screen share did not support any prediction.
3. So once again...To Google
4. It does help to follow the tutorials after reading some of the printed information.
5.  I noticed one commonality, for the most part I found at least a quarter of the names for the accessibility functions very  difficult to understand. IN some cases, even after reading the description I was left wondering " how does that help?"
6. I also found that, with the exception of the IPad, many of these options are very successfully hidden.  This is a shame because, as with most accessibility innovations they help every one...or am I the only one that has asked SIRI to make a phone call while driving?
7. Android  Has voice input and talk back as well as a braille read back option,  There is a full suite of screen options and that enhance readability although I am not sure if it can direct you to a woodfired pizza on demand ( I pad can)
8. Chrome  I bought these for my EAL students at the advise of several teachers and my tech guys.  There are three out with families so I may here a little more back at the end of summer. It is an access platform however the accessibility access seemed a little difficult.  the do have magnifying, contrast, change of font size and brightness so that is a good thing.  Pretty difficult to get directions to a woodfired pizza oven although I have to admit, I did not try.
9. I pad  The gold standard in accessibility. I have heard one member of the disability community claim that it was as if Apple listened to all of their requests... pretty good praise.   Of course it has text input and out put and this can be "locked" so that it becomes the sole access media for visually impaired.  The word prediction is wonderful for LD and  the fat thumbed. I still find the access to different options a little difficult however my daughter has convinced me that that is my disability, not a short fall of the I pad.  The screen seems to turn off rather quickly but I am sure that any five year old could fix that for me.  This thig can find the wood fired pizza and provide exact instructions to the front door.
10. Mac has some pretty simple symbols and explanations to define where and who may find their various functions helpful... Nice
11. Finally the PC....
12. Has different screen settings but the alarm only sounds, no flashing so not so good for  the hearing impaired.  Voice is available but for the real powerful add-ons you need plugins or to buy them, no so nice, they are expensive and eat up a great deal of memory.  As you get older it may be best to put aside a little money for an apple or I-pad... the PC will not see you through age related hearing and sight loss unless you are rich, do not want to move your computer off its present location and are extremely competent at tech support.