Shift swaps without a WhatsApp group
In Shifora you ask a colleague for a swap directly. Once agreed, it is in the rota.

Propose a swap
Choose your shift and the colleague you want to swap with; they get a notification.
Open shifts
A shift without a name appears for those allowed to take it, and one click fills it.
Straight into your calendar
Whoever gains or gives away a shift also sees it in their own calendar.
Also in Free
Swaps and open shifts are part of every version of Shifora.