We tried the 9 most popular food-delivery apps in America - and the winner is clear

Kate TaylorChef'd was one of many food-delivery services I tried.After a week of surviving off of food-delivery apps, I know a thing or two about which one is best.

The food-delivery industry is a $10 billion business, according to Morgan Stanley estimates. And it's only growing - according to Morgan Stanley, there are billions of dollars to be made in the delivery space.

As a result, startups are eager to establish themselves as delivery go-tos and carve out their own space in the market.

Spending a week without leaving my apartment, only eating food ordered via delivery, I had the perfect opportunity to compare different food-delivery apps.

Here's how nine of the biggest names in the business measure up, ranked from best to worst.