There’s one app millennials can’t live without, and it’s not Instagram, WhatsApp, or Snapchat.

More than a third of those ages 18 to 34 say they can’t go without Amazon, according to comScore’s 2017 US Mobile App Report. Gmail and Facebook ranked second and third. That bodes well for Amazon, especially as millennials age and grow their earnings power.

Snapchat, despite being high on the cool quotient, featured nowhere on the most essential apps for 18- to 34-year-olds.

“It speaks to a broader insight, which is that millennials seem to recognize the importance of the more functional apps, like Amazon, Gmail and Google Maps,” said Andrew Lipsman, the senior vice president of insights and marketing at comScore. “I’d imagine if you asked which apps they found to be the ‘most fun’ you’d probably see the social, video and music apps hit the top of the list.”

This is just the latest feather in Amazon's cap. With Amazon's purchase of Whole Foods getting the green light, the retail giant is quickly becoming an unstoppable force, poised to take over not just retail but also the hardware and advertising businesses.