Mettle is described as an "end-to-end platform for businesses", combining a current account with invoicing and bookkeeping capabilities.
Mettle has been designed to give businesses a new way to manage their finances, according to NatWest. The mobile app will allow customers to open a business current account, forecast their business performance, create invoices from their mobile phone and provide reminders for chasing payments. All of these features will be provided on one app that comes with a debit card.
Mettle is currently at a pilot stage; NatWest says that customers who open an account will work closely with the Mettle team to influence how the product will develop.
Alison Rose, chief executive of commercial and private banking at NatWest, said: "We are really excited to launch Mettle ... With a constantly evolving banking and technology landscape we know we need to adapt in order to offer new customer-focused solutions. The premise for Mettle lets our customers focus on 'forward-looking' finances, combining technology and proactive insights so SMEs can make better decisions and run their businesses more successfully.
"Being able to engage with our customers and to get their direct feedback, at this early stage, is extremely important to us. We wanted to launch this new innovative account so that customers can focus on achieving their entrepreneurial goals while staying on top of their financial commitments. With their invaluable insight, we hope to save our customers from worrying about daily account management and cash uncertainties of the future."
Mettle is being run independently from the bank and NatWest says both customers and non-customers will be able to apply for an account.