Verdict
Head-to-head · Best Single-Serve Coffee Makers

Keurig K-Duo Single Serve and Carafe Coffee Maker vs Keurig K-Supreme Plus Smart Single Serve Coffee Maker

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

Keurig K-Supreme Plus Smart Single Serve Coffee Maker comes out ahead by a clear margin (3.5 vs 4.6). The gap is mostly about users wanting balance of convenience and coffee quality — read the strengths below before deciding.

Keurig K-Duo Single Serve and Carafe Coffee Maker
Ranked #8 in Best Single-Serve Coffee Makers
Keurig K-Duo Single Serve and Carafe Coffee Maker
$569as of Jul 9

The Keurig K-Duo Single Serve & Carafe Coffee Maker offers versatility by brewing both K-Cup pods and ground coffee in carafe sizes up to 12 cups. The Spruce Eats reviewer praised its straightforward setup process and convenient adjustable water reservoir that maximizes counter space. However, GearLab's review criticized the brew quality, noting that the machine fails to reach industry-standard water temperatures and lacks even water distribution. While it's user-friendly and keeps coffee warm for several hours, the lack of customizable settings and poor consistency in brewing multiple batches makes it less ideal for heavy users. This product suits those wanting flexibility between pod and drip brewing but may disappoint those seeking premium coffee quality.

Strengths
  • Makes single servings and carafes
  • Adjustable water reservoir allows for flexible counter space usage
  • Easy to use and set up with simple button operations
Watch-outs
  • Settings are not very customizable
  • Brew quality is compromised with subpar water temperature and distribution
Keurig K-Supreme Plus Smart Single Serve Coffee Maker
Higher ratedRanked #2 in Best Single-Serve Coffee Makers
Keurig K-Supreme Plus Smart Single Serve Coffee Maker
$199.99as of Jul 9

The Keurig K-Supreme Plus Smart Single Serve Coffee Maker features Keurig's MultiStream technology, which improves extraction by punching five holes in K-Cup pods instead of one. Reviewers noted it delivers better coffee quality and offers customizable brew strength, temperature, and drink sizes. However, some reviewers criticized the brew temperature and extraction time as still being suboptimal. The machine also comes with a premium price tag, making it less accessible for budget-conscious buyers. It's best suited for those wanting a balance between convenience and coffee quality without the full smart connectivity features of the K-Supreme Smart model.

Strengths
  • MultiStream technology improves coffee extraction and flavor
  • Offers 6 brew size options (6-12 oz) and 5 strength settings
  • Includes programmable buttons for saved brewing preferences
Watch-outs
  • Brew temperature still too low for optimal extraction
  • Extraction time remains insufficient for full flavor development
  • Price is fairly high compared to basic models

How they stack up

Keurig K-Duo Single Serve and Carafe Coffee Maker

The K-Duo offers versatility between pod and drip brewing, a feature not available in the Nespresso Vertuo Next or Essenza Mini, but it's less customizable than the Keurig K-Elite and K-Supreme Plus in terms of brew settings. While it's user-friendly, its brew quality is compromised compared to the Keurig K-Elite and K-Supreme Plus, which offer better temperature control and extraction.

Keurig K-Supreme Plus Smart Single Serve Coffee Maker

The K-Supreme Plus introduces MultiStream technology that improves extraction quality compared to the Keurig K-Elite and K-Classic, but it's more expensive and still falls short of optimal brew temperatures. Unlike the Ninja DualBrew Pro, it lacks a built-in milk frother, and while it offers more customization than the K-Mini Plus, it's less compact and doesn't support ground coffee brewing.

Specs side-by-side

SpecKeurig K-Duo Single Serve and Carafe Coffee MakerKeurig K-Supreme Plus Smart Single Serve Coffee Maker
CompatibilityK-Cup podsK-Cup pods
Brewing MethodsK-Cup pods and ground coffeehot and iced
Water Capacity72oz66 ounces
Dimensions12.9" H x 10.9" W x 12.7" D12.2H x 7.9W x 12D inches
Weight9.7 lb5.8 lb
Brew Sizes6-12 ounces6-12 ounces
MaterialStainless SteelStainless Steel
Wattage1500W
← See the full ranking of best single-serve coffee makers