Ride-hailing firm Grab reported a technical issue with its app yesterday, with other countries in the region such as Malaysia and Indonesia similarly hit.
Grab users found they could not access the app, and the problem coincided with train delays on the Downtown Line that were first reported during the morning rush hour.
In a Facebook post at 8.30am, Grab Singapore said that its engineers were looking into the issue and "expect (the app) to be back up in 30 minutes".
Grab users in Malaysia, Indonesia and Vietnam were also affected by the technical glitch.
At about 10am, Grab informed users in Singapore that they would be able to pay for rides using cash and cards linked to GrabPay.
However, it added that it was still working to restore its GrabPay Credits and Rewards features, and reassured users that their GrabPay Credits and Rewards balances - which were missing in the app - would reappear.
At about 11am, Grab said in an update on Facebook that all issues had been resolved.
"You can now resume booking with all types of payment. We are sorry for all the inconvenience caused, and we thank you for your understanding," said Grab.
Transport operator SBS Transit had tweeted at about 7am that train service towards Bukit Panjang and Expo stations was delayed due to a signalling fault.