Synapptic Reader is a screen reader, designed to work alongside the main Synapptic app. It aims to help blind or low vision users navigate Android by verbally describing the contents of the screen.
When you touch the screen, a coloured highlight outlines the element you've touched and a voice describes it, reading out any text.
If it can be interacted with you can double tap anywhere on the screen to activate it. You can also swipe right or left to move to the next or previous element.
Synapptic Reader can be used standalone by toggling on the 'Enable Touch Interaction when service starts' option in the settings menu.
Please note: This app uses the Accessibility API to understand and describe the contents of any app displayed on screen, as well as display a highlight overlay on top of them.