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

Cold brew made simple

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The World's Simplest Way to Make Cold Brew Coffee

We set out to make the world's simplest cold brew coffee system. Introducing Rumble Jar. We over-engineered every last detail of our filter 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.

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.

Kickstarter

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