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Ninja PB051 Single-Serve Coffee Maker vs Keurig K-Express Coffee Maker

The Ninja PB051 is the more versatile machine: it brews both pods and grounds, offers seven grounds sizes up to 24 oz, four brew styles, and a built-in frother for lattes and cappuccinos. The Keurig K-Express is smaller, lighter, and simpler, with a 42 oz removable reservoir, back-to-back brewing, and a Strong Brew button, and it has a large base of satisfied owners. Choose the Ninja if you want one machine for pods, fresh grounds, and milk drinks; choose the Keurig if you mostly brew K-Cups and want a compact, low-fuss brewer.

  • Choose the Ninja PB051 if you want pods and grounds in one machine, large travel-mug brews, and a frother for milk drinks.
  • Choose the Keurig K-Express if you brew K-Cups daily and want a compact, lightweight brewer with a removable reservoir and simple controls.

Prices

  • Ninja PB051 Single-Serve Coffee Maker: $89.95 at Amazon (checked today)
  • Keurig K-Express Coffee Maker: $74.99 at eBay (last seen Nov 6)
  • Difference: the Keurig K-Express Coffee Maker is $14.96 cheaper than the Ninja PB051 Single-Serve Coffee Maker at the latest prices (Nov 6 and Nov 9)
Ninja
Single-Serve Pods & Grounds Specialty Coffee Maker

Ninja PB051 Single-Serve Coffee Maker

Single-Serve Pods & Grounds Specialty Coffee Maker

$89.95at AmazonObserved at 1:27 AM
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Pros
  • Brews pods and grounds in one machine
  • Seven grounds sizes up to 24 oz
  • Four brew styles, including an over-ice setting
  • Built-in frother for lattes and cappuccinos
  • Storage drawer for the brew basket or filter
Cons
  • Heavier and bulkier than the Keurig
  • No removable water reservoir
  • Fewer pod sizes than grounds sizes
  • Frother adds parts to clean
Keurig
Keurig K-Express Single-Serve Coffee Maker

Keurig K-Express Coffee Maker

Keurig K-Express Single-Serve Coffee Maker

4.6(1,953 ratings)
$74.99at eBayObserved Nov 6, 2026, 3:58 PM
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Pros
  • Compact and light at 4.1 lbs
  • 42 oz removable reservoir brews several cups before refilling
  • Strong Brew button for bolder coffee
  • Back-to-back brewing without a reheat wait
  • Auto off after 5 minutes
Cons
  • K-Cup pods only unless you buy the My K-Cup filter
  • Just three cup sizes, topping out at 12 oz
  • No frother or over-ice mode
  • Plastic body

What separates them

Ninja PB051 Single-Serve Coffee MakerKeurig K-Express Coffee Maker
Pod and grounds brewingBrews both pods and grounds, with a pod adapter and permanent filter includedK-Cup pods only; grounds require the My K-Cup filter, sold separately
Brew sizesPods 6-12 oz; grounds 6-24 oz in seven steps8, 10, or 12 oz
Brew stylesClassic, Rich, Over Ice, and Specialty concentrateStandard brew plus a Strong Brew button
Milk frothingBuilt-in fold-away frother, removable for cleaningNone
Water reservoirFill per brew; no removable reservoir42 oz removable reservoir, about four 8 oz cups between refills
Footprint and weight7.8 lbs, larger body with a storage drawer4.1 lbs, 5.1 in wide
Travel mug clearanceUp to 8 inUp to 7.4 in with the drip tray removed
Auto shutoffNot specifiedTurns off 5 minutes after the last brew

Price history

$89.95$69.99
Nov 1Nov 9
  • Ninja PB051 Single-Serve Coffee Maker: lowest $89.95 on Nov 9 at Amazon.
  • Keurig K-Express Coffee Maker: lowest $69.99 on Nov 1 at Amazon; $79.99 on Nov 8.

Prices at every store

Ninja PB051 Single-Serve Coffee Maker

  • StaplesNew

    In stock

    $99.99Free shippingObserved at 1:27 AM
    Visit Staples
  • Get Your ThingNew

    In stockReturn policy

    $114.99Observed at 1:27 AM
    Visit Get Your Thing
  • The Home DepotNew

    In stock

    $129.95Free shippingObserved at 1:27 AM
    Visit The Home Depot
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $89.95Free shippingObserved at 1:27 AM
    Visit Amazon
All 11 stores and price history →

Keurig K-Express Coffee Maker

  • WalmartNew

    In stockSold by Danext EcomReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $79.98Observed Nov 7, 2026, 10:00 PM
    Visit Walmart
  • StaplesNew

    In stock

    $109.99Free shippingObserved Nov 7, 2026, 9:55 PM
    Visit Staples
  • eBayNew

    Availability unknown

    $74.99Observed Nov 6, 2026, 3:58 PM
    Visit eBay
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $79.99Free shippingObserved Nov 7, 2026, 10:00 PM
    Visit Amazon

Also available at

  • Its DealsCheck price at Its Deals
  • The Firm Ground Coffee, LLCCheck price at The Firm Ground Coffee, LLC
  • moabrewCheck price at moabrew

Store links may earn us a commission. Some prices via Klarna.

All 6 stores and price history →

Specs compared

SpecNinja PB051 Single-Serve Coffee MakerKeurig K-Express Coffee Maker
Weight7.8 lbs4.1 lbs
Voltage120 volts120 V
Brew sizes6, 8, 10, 12, 14, 18, or 24-oz. grounds brew—
Pod brew sizes6, 8, 10, or 12-oz. pod brew—
Brew stylesClassic, Rich, Over Ice, or Specialty—
Wattage1550 watts—
Amperage12.5 amps—
Travel mug clearanceup to an 8" travel mug—
FrotherBuilt-in, fold-away frother—
Warranty1—
Cup sizes—8 oz 10 oz and 12 oz
Water tank capacity—1.3 qt
Show all 40 specsShow fewer specs
SpecNinja PB051 Single-Serve Coffee MakerKeurig K-Express Coffee Maker
Removable water tank—Yes
Variable coffee strength—Yes
Auto shut off—Yes
Cord length—3 ft
Width—5.1 in
Depth—12.8 in
Height—12.6 in
Capacity—Single Cup
Water Tank Size—42 oz.
Brew Style—

What reviewers say

Ninja PB051 Single-Serve Coffee Maker

Reviewers generally appreciate the Ninja PB051 for its ability to brew both pods and grounds, its wide range of brew sizes, and the built-in frother. Many find it a good value for the features. Common complaints include noise during brewing and occasional issues with the pod adapter or durability.

What people mention
  • VersatilityPraisedReviewers love that it brews both pods and ground coffee, eliminating the need for two machines.
  • Brew optionsPraisedThe variety of brew sizes and styles, especially Over Ice and Specialty, is frequently highlighted.
  • NoiseCriticisedMany users find the brewing process to be loud, especially compared to other single-serve makers.
  • Pod adapterMixedWhile some find the pod adapter convenient, others say it can be finicky and requires careful alignment.

Keurig K-Express Coffee Maker

  • 4.6 / 51,953 ratings

Owners generally find the K-Express quick and easy for a single cup, with the Strong Brew option a common favorite. Complaints center on the plastic build and the small reservoir.

What people mention
  • Brew speedPraisedOwners say a cup is ready in minutes with little fuss.
  • Strong brewPraisedThe Strong Brew button is often called out for bolder, less watery coffee.
  • BuildCriticisedReviewers describe the plastic body as basic and lightweight.

Questions and answers

Which is better for lattes and iced coffee?
The Ninja. It has a Specialty concentrate setting for milk drinks, an Over Ice brew style, and a built-in frother. The Keurig K-Express has neither.
Which is better if I only drink K-Cups?
The Keurig K-Express. It is simpler, lighter, and holds a 42 oz reservoir so you can brew several cups before refilling. The Ninja works with pods too but adds grounds features you may not use.
Can I use my own ground coffee in both?
Yes. The Ninja includes a permanent filter and brews grounds directly. The Keurig needs the My K-Cup reusable filter, which is sold separately.
Which fits a tall travel mug?
The Ninja clears mugs up to 8 inches with its 24 oz brew. The Keurig fits mugs up to 7.4 inches with the drip tray removed.
Is the Keurig worth stepping up to the Ninja?
Step up if you want larger brews, grounds, brew styles, or a frother. Stay with the Keurig if counter space and simple pod brewing matter more.
Which is easier to keep filled and clean?
The Keurig, thanks to its removable 42 oz reservoir and dishwasher-safe drip tray. The Ninja has more parts, including the frother and brew basket, to rinse.

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Buying guides that pick them

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Single Cup
Brewing System—Single Cup, K-Cup, Pod Compatible
Brew Strength—STRONG BREW
Pod Style—K-Cup
Brew Settings—Temperature Control
Pod Type—Single-serve
Removable Drip Tray—Yes
Dishwasher Safe—No
Filter Type—Reusable Coffee Filter (My K-Cup, sold separate…
Material—Plastic
Water Filter System—Aquaclean
Commercial Use—No
Use—Kitchen
Typical Users—Coffee lovers
Gifts For—Holiday gift guides, Gifting
Controls Type—Button
actual_color—Black
color—Black
size—12.8” L x 5.1” W x 12.6” H
ReservoirMixed
The 42 oz tank is handy for a few cups but needs refilling for a household.