Cold brew made simple


The World's Simplest Way to Make Cold Brew Coffee

See it in action

Simple. Beautiful. Delicious.

Kickstarter project

We launched Rumble Jar on Kickstarter in November 2017. The reception was truly unreal! In case you missed that campaign but want to see what the early-adopters think about Rumble Jar, check it out below.


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

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

Introducing Rumble Jar