Robinhood, the free stock-trading app, crashed on the worst day possible.
Stocks rallied Monday with the Dow logging its biggest point gain in history. The S&P 500 gained $1.1 trillion Monday. But an all-day system-wide outage left Robinhood customers seethingAn "issue with a part of our infrastructure" caused the 17-hour long disruption, the company said in a statement. The service has about 10 million customers"We realize we let our customers down, and we're committed to improving their experience," a Robinhood spokesperson said. The company said the issue was fixed, but the service went down again Tuesday shortly after trading began.