asobu Cold Brew Coffee Maker
- Cold Brew Coffee Maker
- Coffee Infuser
- coffee_grounds
- Standard Packaging
- More reviewed than 56%
A capable manual cold brew setup with genuine 24-hour cold retention, worth it if you're fine steeping a day ahead and can accept one reported lid durability issue.
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How it ranks among the 9 cold brew coffee makers we track
4.5★ across 1,600 Amazon ratings, Bayesian-smoothed toward the category average.
1,600 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 9 cold brew coffee makers we track - how the scorecard works · full cold brew coffee makers data report. Confidence: medium - useful but incomplete evidence.Last refreshed Jun 15, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
A manual cold brew system with a 32 oz brewing chamber and a 40 oz vacuum-insulated stainless steel carafe, using coarse grounds steeped 12-24 hours to make a concentrate served hot or over ice.
This produces a concentrate rather than a ready-to-drink brew, so it's diluted or served straight depending on preference, and the steep runs closer to a full day than quick-brew cold coffee gadgets. Cleaning requires care around the small ball-bearing valve seal, and one recurring issue in reviews was a lid that failed after regular use, with the company replacing it but taking roughly two months to ship the part.
- 32 oz brewing chamber, 40 oz insulated carafe
- Copper vacuum insulation, cold up to 24 hours
- BPA-free Tritan brew basket
- Leakproof, portable stainless steel body
Who it's for
Coffee drinkers who don't mind planning a day ahead and want a portable, insulated carafe rather than a pitcher. Less suited to a two-person household wanting daily cold brew, since the 40 oz carafe runs out fast when split.
What buyers say
From Amazon customer reviews.
Reviewers consistently praised the smooth, less bitter flavor and the convenience of a self-contained brew-and-carry carafe, with several comparing it favorably against store-bought cold brew. The main complaint was a defective lid on at least one unit, which the company replaced but took close to two months to arrive, and one owner noted the 40 oz size doesn't stretch far for two coffee drinkers.
Strengths and trade-offs
Drawn from this product's published specifications.
- Genuine 24-hour cold retention per the insulated carafe
- Portable, leakproof design for office or car
- Works with regular coffee grounds, no special filters
- BPA-free Tritan brewing chamber
- Requires a 12-24 hour steep, no same-day brewing
- 40 oz carafe is tight for two people
- One reported lid failure, with a slow replacement process
Performance notes
Cold water draws through the coarse grounds over the full steep window, and the copper-insulated stainless carafe is rated to hold the brew cold for up to 24 hours afterward. The brewing basket is BPA-free Tritan plastic. Reviewers generally described the seal as leakproof once the ball-bearing valve is placed correctly during reassembly.
Specifications
| Brand | asobu |
|---|---|
| Model | KB900BK |
| Dimensions & fit | |
| Item Weight | 2.5 pounds |
| Item Dimensions D x W x H | 5.4 × 5.4 × 14 inches |
| Construction & materials | |
| Material | Stainless Steel |
| Color | Black |
| Exterior Finish | Stainless Steel, Tritan |
| Compatibility & installation | |
| Human Interface Input | Buttons |
| Smart Home Compatibility | Not Smart Home Compatible |
| Included components | |
| Customer Package Type | Standard Packaging |
| Unit Count | 1 |
| Included Components | Brewer and Mug |
| Warranty & support | |
| Warranty Description | None |
| Other details | |
| Coffee Maker Type | Coffee Infuser |
| Coffee Input Type | coffee_grounds |
| Filter Type | Reusable Filter |
| Number of Items | 1 |
| Is the item dishwasher safe | No |
| Style | cold brew coffee maker |
| Operation Mode | Manual |
| Part Number | 408824 |
| Recommended Uses For Product | Cold Brew Coffee On-the-Go |
| Item Type Name | Cold Brew Coffee Maker |
| Other Special Features of the Product | cold brew coffee maker bpa free, coldbrew coffee makers, portable cold brew coffee maker, pour over brewer |
| Specific Uses For Product | Cold Brew Coffee Maker |
How it compares
This product against the closest alternatives we track in cold brew coffee makers.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| asobu Cold Brew Coffee MakerThis product | 4.5 / 5 | 1,600 | 4.4 / 5 |
| Hario "Mizudashi" Cold Brew Coffee MakerHario | 4.6 / 5 | 11,921 | 4.7 / 5 |
| HyperChiller EHC824 Iced & Hot Coffee MakerElite Gourmet | 4.1 / 5 | 7,812 | 4.2 / 5 |
| Primula Cold Brew Pour Over Glass Coffee MakerPrimula | 4.4 / 5 | 868 | 4.3 / 5 |
| VINCI Express Cold BrewVinci | 4.3 / 5 | 2,165 | 4.2 / 5 |
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Questions about the asobu KB900BK
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
How long does it take to brew?
The steep runs 12 to 24 hours with cold water and coarse grounds; it isn't a quick-brew system.
Does it leak when carrying it around?
Reviewers generally found it leakproof once the ball-bearing valve seal is seated correctly during cleaning and reassembly.
Is 40 oz enough for two people?
It can be, but at least one reviewer found it too little to cover both themselves and a partner daily.