More than 2.5 million people have downloaded the app since it was launched in May 2020, but the proportion of the population aged 15 or older actually actively scanning has never surpassed 25 per cent – a high reached in September, when all of New Zealand was at alert level 2. Cameron Burnell/Stuff Victoria University clinical psychologist Dr Dougal Sutherland says scanning QR codes still isn’t an engrained habit for most of the population. Last week saw usage edge close to that, with 23 per cent of the population scanning in on Thursday, when lockdown restrictions lifted for Auckland and businesses reopened. But there’s been a steady decline since then, with Sunday’s numbers back at 18 per cent.