a keyboard should meet you where you are.
the way you use a phone can change from one moment to the next. you may have one hand occupied, need to avoid a large grip shift, or simply prefer controls closer to one thumb.
an adaptable keyboard gives you a choice about position without asking you to learn a new alphabet or commit to a single setup.
what iphone already offers.
iphone includes reachability and a one-handed keyboard layout, both of which are worth trying. they can bring the screen or keyboard closer without adding another app.
una mano is another option when you want left, centre, and right positions available from the keyboard you are already using.
keep the choice yours.
no keyboard position is universally better. the useful position is the one that lets you type with the reach and grip that suit you right now.
una mano does not make medical claims or replace accessibility advice. it offers one practical control: move familiar keys closer to the thumb that is typing.