Cold brew made simple

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An Ultra Simple Cold Brew Coffee Maker for Your Home

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See how Rumble Jar works, in 92 seconds

How easy is it?

quick instructions

Simple and smart.

To build the world's simplest cold brew filter, we needed to think through the smallest details. Rumble Jar looks simple, but it's packed full of smart features. 

Details
Rumble Jar's stainless steel construction is far more durable than typical mesh filters

Kickstarter reviews

We launched Rumble Jar on Kickstarter in late 2017 and were blown away by the reception! Click below to see the early-adopters' reviews in all their 100% honest glory. (hint: we're obviously quite proud of the response!)

Reviews

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