Is there an app to learn and use morse code that is using vibration?
Either instead of sound/light or offering it additionally.

The idea is to allow people to type in text that is read out in vibrating morse code for deaf-blind.

Deaf-blind usually use the Lorm-alphabet (taps or strokes on finger and/or hand represent a letter) but as far as I know there is no app yet not even in trial stage.

Although with touchscreen and vibration it should be possible technically (dreaming of a an app where a deafblind who puts his hand on the screen and feels the vibration while the app translates text to Lorm; maybe even the other way round so a deafblind could send text .. ).

Morse code might be an option in the meantime.