As applications become more complex, a single JavaScript error can really make a difference to your bottom line. The average Fortune 1000 company, after all, spends upwards of $2.5 billion each year on unplanned Application downtime. When an app doesn’t work like it’s supposed to, it doesn’t exactly inspire users to continue fidgeting with it. Thanks to real user monitoring (RUM) tools, you can gain deeper insight into the health of your applications.