Cold brew made simple


The World's Simplest Way to Make Cold Brew Coffee

See it in action

Introducing Rumble Jar

Kickstarter reviews

We launched Rumble Jar on Kickstarter in November 2017. The reception was truly unreal! If you missed our campaign but wanted to check out what the early-adopters think about their Rumble Jars, the Reviews button below will take you to our campaign's Comment section, in all its honest glory.


Simple and smart.

Rumble Jar was designed to make cold brew coffee as simple as possible. That meant thinking through every last tiny detail...and eliminating everything else.

I prefer my coffee to be super bitter and acidic.

-No one ever

I'm looking to spend a bunch of money on equipment I don't need so that I can clean it later.

-No one ever

Cold brew tastes better

There's a reason why you're always hearing about cold brew coffee, and that's because a lot of folks find it just plain old tastes better. The secret is that cold water extracts about 70% less acid from the coffee grounds than hot water, which means that your coffee ends up tasting a lot less bitter. So if you're new to cold brew, get ready to enjoy a smoother, sweeter flavor of coffee. 

Cold brew science