Red means stop! Banking app cuts customer spending

The SaaS platform offers greater flexibility , faster implementation times and efficient design and deployment of multi channel customer interaction. Caption designer: Stephan Drescher

NEW YORK: Traffic lights don't just work for drivers, some bank customers obey them on their smartphones too. 

A transaction-tracking app using red, yellow and green messages to warn account holders when they are paying out more or less than usual has resulted in some users spending less, a potentially powerful new weapon in the battle for customers.