Rumble Jar | The World's Simplest Cold Brew Coffee Filter

Coffee should be easy

The Simplest Cold Brew Filter

We set out to make the world's simplest cold brew system. Introducing Rumble Jar. We over-engineered every last detail of our filter system so that your morning routine would be as simple, quick and affordable as possible. And then we designed the whole thing to fit snugly inside of the time-tested mason jar. Beautiful equipment. Simple brewing. Delicious cold brew coffee.

Pre-order

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

Great tasting cold brew

super easy to prepare

High quality components

in a beautiful package

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

Kickstarter project

We launched Rumble Jar on Kickstarter in November 2017. The reception was truly unreal. Our backers are the best! If you missed that campaign but have interest in pre-ordering your own Rumble Jar, click the button below to head to our pre-order site.

Pre-order