As of Sunday, more than 58 per cent of South Australians over the age of 16 have been fully vaccinated, and more than 75 per cent have received their first dose.

Fifty people are now taking part in a three-week pilot test of VaxCheck, a function inside the mySA Gov app that should eventually allow people to show their vaccination status and check-in to a venue through the same app.

Currently, digital vaccination certificates are available through myGov and the Express Plus Medicare app, which generate certificates that can be saved to a smartphone wallet.

South Australian Premier Steven Marshall said the pilot test "will ensure that the process is secure and convenient and that we are ready when the time comes to reopen our state in the safest way possible".

Mr Marshall wants the state to reach 80 per cent double vaccination status before opening domestic borders, a target it is on track to hit in December.

A similar function allowing people to check-in and confirm vaccination status was added to the Service NSW app on Friday, but Mr Marshall said his state won't be following a NSW plan to allow vaccinated international travellers who test negative for the virus to avoid quarantine at this stage.

Mr Marshall says SA will focus on domestic borders after it hits its target, and will "look at international borders after that".

Australian Associated Press