More than a 1000 compliance visits have been made since Monday, but no fines had been issued as of Friday afternoon.

ACT Health Minister Rachel Stephen-Smith on Friday said it was too early to identify whether the number of check-ins was slow for newly mandatory settings, including public transport.

"We saw more than 307,000 check-ins from midday yesterday to midnight last night, so that's a massive increase in the number of check-ins that we're seeing, really demonstrating that people are doing the right thing and checking in," Ms Stephen-Smith said.

The use of the check-in app became mandatory across all retail outlets and public transport on Thursday, after a two-week period to allow businesses to prepare.

While the number of check-ins has risen, some businesses appear to have struggled maintaining high levels of compliance from customers.

The average daily number of check-ins rose about 140 per cent in that period, from 111,844 a day before the move to mandatory check-ins was announced to 268,840 in the following fortnight.

More than 8700 QR codes were installed on the territory's bus and light rail fleet before the use of the app became mandatory.

Ms Stephen-Smith said earlier in the week Canberrans had gotten into the habit of using the check-in app.

"It is something, I think, we get used to. We've talked before about the habit building we've done over the last 18 months, and checking in is now becoming a habit, I think, for all of us, and it's something that we just need to continue to remember," she said.

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