
But customers were still complaining that there is an issue with the app, even though the bank said it was working normally.
A spokeswoman for Barclays said they were working to fix the problems.
A customer, Charlotte Vella, criticised the bank for not forewarning customers on social media, saying: "numerous people [have been] turned away from carrying out basic transactions".
Customers complained on Twitter the service went down around 10am this morning.
Customers say they can not get the Barclay's homepage to load meaning there is no access to their online account portal.
Telephone banking and ATMs were not impacted by Friday's problems.
According to the group's latest annual report it has 19 million customers in the United Kingdom and Republic of Ireland with 5.5 million active mobile app users.
In 2014 it was fined £56m by regulators after a 2012 software issue left millions of customers unable to access accounts for weeks.
But this week has marked three bank outages.
Barclays customers are unable to access their online banking or use telephone banking due to a "technical hitch".
Then on Thursday Barclays customers were locked out of their accounts online for several hours.
Royal Bank of Scotland Chief Executive Ross McEwan told LBC Radio that the outage may be related to regular changes it had made to its technology, such a change to its firewall, but the cause was not clear yet.
"So how do you expect me to pay my bills today when I work 9-5", Natalie Wilkinson said in a tweet to NatWest, asking other users to recommend a more reliable bank.
Hannah Maundrell, editor of Money.co.uk said: "Banks really need to pull their socks up because this keeps happening".
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