Yes, the Standard Bank Mobile Banking App is password protected and doesn’t allow unauthorised access. If someone tries to retrieve your password they will have to give additional account information, which should be unknown to them.
You also have to enter a one-time-password to add recipients and make once-off payments. Your daily withdrawal limits on specific transaction types also minimise risk if your password was indeed compromised.
If your device was stolen, log onto another device, go to Settings and delink the stolen device from your Standard Bank ID