About Us

We'll start off by bragging just a little. Rumble Jar landed a Kickstarter Project of the Year Award in 2018 in no small part due to some pretty good reviews by our earliest adopters, but we also had a great first professional review, a big thumbs-up from Architectural Digest, an amazingly thorough and spot-on independent review, a nice blog mention here, a thorough unboxing video here, a solid thumbs-up from a highly-reputable coffee gear website, plus this Reddit feed saying nice things about Rumble Jar, and Outside Magazine recommending our brand-new Rumble Go. And can't forget our first TikTok review!

A Rambling Story about a Rumbling Jar

Coffee...we drink a lot of it. That was our "coffee expertise", at least until early 2017 when Karl got fed up with all of the existing cold brew coffee filters out there and started hacking away on some new ideas he came up with to make a better one. Hans remained skeptical. But Karl converted Hans to cold brew through a combination of sorcery and brainwashing (i.e. having him taste it) until Hans capitulated and saw the light...cold brew was better! 

Both of us are product designers and creators, and while we're pretty good at developing concepts, we're even better at finding folks who have real expertise to make our ideas come to life. We hunted around and linked up with the perfect manufacturing shop that strictly works on coffee devices, and off we went to designing, prototyping and playing with our different ideas. And talking to the cold brew experts...folks that didn't just learn about it yesterday, but have been seriously tinkering with cold brew for decades, long before every store was selling it. This group of folks had seen and made it all, so when they said, "Wow this is a really good idea," we knew we were onto something! (or they just say that to everybody)

So in late 2017, we brought Rumble Jar to life on Kickstarter. Despite the fact that it was essentially just a coffee filter competing with things like fancy drones and cool new smart touchscreen devices and artificial intelligence whatevers, Rumble Jar's reception was pretty mind-blowing (over $50K raised in 3 weeks)! People were actually getting excited about a fairly simple cold brew coffee filter that didn't even feature a single moving part. So if Rumble Jar can make it on Kickstarter, it can make it anywhere! 

Best of all, the Kickstarter reviews were pretty fantastic! And we have no problem bragging a bit about that because we're really proud of all the work we put into making sure folks got a product they were happy with.

And then we were floored to find out Rumble Jar was selected by the Kickstarter staff as one of their 26 Projects of the Year!

So that's our story! Feel free to reach out to us via email (see our Contact page) (or send us some snail mail to our mailing address below):

Buffoonery Factory LLC
584 Castro St., PMB 326
San Francisco, CA 94114

-Hans & Karl