Accessible technology and screen readers

Accessibility Feature Talk Back (Android Lollipop 5.1) Narrator (Windows 8.1) VoiceOver (iOS 8.2)
Voices No voice options, only volume changes 3 Voices (male and female) 5 Dialects/Voices
Tutorial Launches automatically, excellent walk through No built-in walk through Built-in but does not launch automatically
Gestures 11 built in gestures with 8 possible options for each Ultimate keyboard driven screen reader (70+ options for commands) 26 built-in touch gestures but not customizable
Menus Local and global context menus, not customizable Nothing similar to Android + iOS Rotor features intuitive menus and is customizable with 29 settings