Starting with NChart3D v3.3, accessibility features for visually impaired people are supported. Utilizing the system VoiceOver API on iOS and TalkBack API on Android, NChart3D can read the values displayed on the graph for you. Although this functionality is turned off by default, it is a matter of setting a single flag to activate it. NChart3D packages for iOS and Android include the related code samples called ‘Accessibility’. 

You can download the newest version of NChart3D on https://nchart3d.com/download.