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Re:How to Design Mobile Apps for One-Hand Usage by Fnoord on Tuesday February 25, 2020 @07:27AM (#22412588)
Interestingly, such UI (well done, but seen such before) challenges the whole size of the smartphone as we know it, akin to a gaming keypad [1] challenging a keyboard.

[1] https://en.wikipedia.org/wiki/Gaming_keypad

Re:How to Design Mobile Apps for One-Hand Usage by BigJ1211 on Tuesday February 25, 2020 @08:20AM (#22412927)
If you want to take it a step further you can look into something such as Azeron[1], I've ordered one myself. But prooduction time is quite long (3 months). So I haven't experienced it myself, ordered it because of RSI issues.

[1] https://azeron.eu

Re:How to Design Mobile Apps for One-Hand Usage by Fnoord on Tuesday February 25, 2020 @01:56PM (#22416031)
Regarding RSI, have you tried a vertical mouse?