The 25 hottest startups that launched in 2015

They may be only months old, but these startups changed technology in 2015.

Take live-streaming app Periscope.

It was acquired before even launching to the public, then capped off the year being named Apple's iPhone app of the year. Meanwhile, Jet had a splashy debut that aimed to chip away at Amazon's ecommerce empire.

We narrowed down the list of startups which launched this year to 25, and to determine the best, we took into account factors like funding, revenue, growth, and investor interest. We're including startups that came out of stealth or opened to the public as launching this year as well.

Did we miss a great startup that launched this year? Let us know in the comments!

Disclosure: Jeff Bezos is an investor in Business Insider through hispersonal investment company Bezos Expeditions.