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Choose the Ninja PB051 if you want to brew either grounds or pods, make larger servings from grounds, or froth milk without a separate appliance. Choose the Keurig K-Supreme if you mainly use K-Cup pods and value four preset cup sizes, a larger water reservoir, and immediate back-to-back brewing. These are manufacturer-listed features, not evidence that one machine makes better-tasting coffee or will last longer.
What’s different about the Ninja PB051 and Keurig K-Supreme?
The Ninja PB051 is designed for both grounds and pods, with more brew-style choices and grounds servings up to 24 ounces. The K-Supreme centers on K-Cup pods, with an optional reusable filter for grounds, a 66-ounce reservoir, and a stated back-to-back brewing feature.
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| Feature | Ninja PB051 | Keurig K-Supreme |
|---|---|---|
| Brewing input | Ground coffee or pods | K-Cup pods; compatible My K-Cup Universal Reusable Coffee Filter for grounds, sold separately |
| Serving sizes | Grounds: 6, 8, 10, 12, 14, 18, or 24 oz; pods: 6, 8, 10, or 12 oz | 6, 8, 10, or 12 oz |
| Brew options | Classic, Rich, Over Ice, Specialty | Regular brew, Strong setting, and hot-over-ice brewing |
| Water reservoir | Removable, 56 oz | Removable, 66 oz, with dual-position placement |
| Milk frother | Built-in fold-away frother | No milk frother, according to Keurig’s product comparison chart |
| Consecutive brewing | Not stated on the cited product page | Manufacturer says it supports immediate back-to-back brewing without a reheating wait |
| Reusable filter included? | Permanent grounds filter and Ninja Pod Adapter listed among box contents | My K-Cup compatible, but sold separately |
Specifications are from the manufacturers’ product pages: SharkNinja’s PB051 listing and Keurig’s K-Supreme listing. They describe stated capabilities, not measured speed, extraction, reliability, or taste.
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Choose the Ninja PB051 for grounds, bigger servings, and milk drinks
The PB051 accommodates grounds servings from 6 to 24 ounces and pod servings from 6 to 12 ounces. Its four listed styles are Classic, Rich, Over Ice, and Specialty. SharkNinja describes the Specialty setting as producing coffee concentrate for coffeehouse-style drinks; that is the manufacturer’s description, not evidence that the result is espresso.
#1 Best Overall
- QUALITY COFFEE: This one cup coffee maker delivers single-serve convenience without sacrificing delicious, full-bodied, flavorful brewing. Designed with our patented Thermal Flavor Extraction system for consistent temperature, even saturation, and calibrated brewing cycles.
- EASY TO USE: Compatible with both pods and grounds, this single cup coffee maker features intuitive, versatile controls to easily brew the exact cup you're looking for. Choose from 4 different brew styles and multiple cup sizes.
- ICED COFFEE MAKER: Features 4 brew styles, including Over Ice, perfect for a refreshing cold brew on a hot summer day. Classic, Rich, and Specialty offer versatile choices ranging from medium to bold and concentrated.
- MILK FROTHER: Use the Specialty brew style to create a rich coffee concentrate, then add creamy frothed milk for cafe-style lattes, mochas, cappuccinos, and more. The built-in milk frother easily folds away for a convenient, space-saving profile.
- DESIGNED FOR CONVENIENCE: Brew cups anywhere from 6 to 24 oz. Adjustable drip tray easily fits travel mugs for busy commuters. 56 oz removable reservoir delivers simple and mess-free refilling. Comes with built-in frother, Ninja Scoop, removable brew basket, Ninja pod adapter, and permanent filter.
The fold-away frother makes the PB051 the more self-contained choice if you regularly add frothed milk. It also ships with a permanent filter and a Ninja Pod Adapter, according to the product page. Check the selected retail bundle, since included accessories can vary.
Choose the Keurig K-Supreme for a pod-led routine
The K-Supreme offers four preset cup sizes—6, 8, 10, and 12 ounces—and a Strong button. Its 66-ounce reservoir is 10 ounces larger than the PB051’s listed 56-ounce reservoir, which may mean fewer refills depending on how much you brew. The machine also has a dual-position reservoir and accommodates travel mugs up to 7 inches, according to Keurig.
Rank #2
- QUALITY COFFEE: This one cup coffee maker delivers single-serve convenience without sacrificing delicious, full-bodied, flavorful brewing. Designed with our patented Thermal Flavor Extraction system for consistent temperature, even saturation, and calibrated brewing cycles.
- EASY TO USE: Compatible with both pods and grounds, this single cup coffee maker features intuitive, one-touch controls to easily brew the exact cup you're looking for. Choose from 4 different brew types and multiple cup sizes.
- ICED COFFEE MAKER: Features 4 brew styles, including Over Ice, perfect for a refreshing cold brew on a hot summer day. Classic, Rich, and Specialty offer versatile choices ranging from medium to bold and concentrated.
- MILK FROTHER: Use the Specialty brew style to create a rich coffee concentrate, then add creamy frothed milk for cafe-style lattes, mochas, cappuccinos, and more. The built-in milk frother easily folds away for a convenient, space-saving profile.
- DESIGNED FOR CONVENIENCE: Brew cups anywhere from 6 to 24 oz. Adjustable drip tray easily fits travel mugs for busy commuters. 56 oz removable reservoir delivers simple and mess-free refilling. Comes with built-in frother, Ninja Scoop, removable brew basket, Ninja pod adapter, and permanent filter.
Keurig says the K-Supreme can brew cups consecutively without a reheating wait. If you want grounds rather than pods, the machine is listed as compatible with Keurig’s My K-Cup Universal Reusable Coffee Filter, which is sold separately.
Check reusable-filter compatibility before buying
Do not assume the Keurig reusable filter works with the Ninja’s pod adapter. Ninja’s user guide says reusable K-Cup coffee filters are not compatible with the Ninja Pod Adapter. For grounds, it directs users to the Ninja grounds adapter with a paper or permanent filter. The PB051 product page lists a permanent filter and pod adapter in the box.
Rank #3
- QUALITY COFFEE: This one cup coffee maker delivers single-serve convenience without sacrificing delicious, full-bodied, flavorful brewing. Designed with our patented Thermal Flavor Extraction system for consistent temperature, even saturation, and calibrated brewing cycles.
- EASY TO USE: Compatible with both pods and grounds, this single cup coffee maker features intuitive, one-touch controls to easily brew the exact cup you're looking for. Choose from 4 different brew types and multiple cup sizes.
- ICED COFFEE MAKER: Features 4 brew styles, including Over Ice, perfect for a refreshing cold brew on a hot summer day. Classic, Rich, and Specialty offer versatile choices ranging from medium to bold and concentrated.
- MILK FROTHER: Use the Specialty brew style to create a rich coffee concentrate, then add creamy frothed milk for cafe-style lattes, mochas, cappuccinos, and more. The built-in milk frother easily folds away for a convenient, space-saving profile.
- DESIGNED FOR CONVENIENCE: Brew cups anywhere from 6 to 24 oz. Adjustable drip tray easily fits travel mugs for busy commuters. 56 oz removable reservoir delivers simple and mess-free refilling. Comes with built-in frother, Ninja Scoop, removable brew basket, Ninja pod adapter, and permanent filter.
By contrast, Keurig identifies the separately sold My K-Cup Universal Reusable Coffee Filter as compatible with the K-Supreme. Before comparing setup cost, confirm the exact model and retail bundle, and whether any filter or adapter you need is included. See the Ninja user guide for its adapter instructions.
What the specifications don’t tell you
The manufacturers’ listed features do not establish which machine makes better coffee, brews faster, is quieter, or holds up better over time. No controlled side-by-side test is cited here, so a taste winner or reliability verdict would be unsupported. The listed brew modes and settings tell you what each machine offers, not how a particular coffee will taste.
Rank #4
- BREW WITH PODS OR GROUNDS: Brew a single-serve cup of coffee with grounds for ultimate flavor or with a coffee pod for ultimate convenience in one small footprint.
- 3 BREW STYLES: Select Classic, Rich, or Over Ice for your grounds or coffee pods.
- ULTIMATE BREW VERSATILITY: Brew a 6, 8, 10, or 12-oz. pod brew or choose from a 6, 8, 10, 12, 18, or 24-oz. grounds brew. Brew more drink options vs. a leading single-serve coffee maker.
- COMPACT DESIGN AND STORAGE: Sleek, compact design takes up little countertop space, with a storage drawer for the brew basket or permanent filter when not in use.
- ICED COFFEE: Brew fresh coffee over ice for a flavorful cup or travel mug that is never diluted.
Before purchasing, verify the current price, availability, market-specific model, and contents of the exact listing. Product bundles and specifications can differ by retailer or region, and promotions may change.
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This comparison is specifically about the Ninja PB051. The PB041 is a different product: its official listing identifies three brew styles and no built-in frother, while the PB051 lists four styles and a frother. Don’t rely on photos, accessory claims, or recommendations that blur the two models; check the model number on the product listing.
Quick Recap
Best Value
- QUALITY COFFEE: This one cup coffee maker delivers single-serve convenience without sacrificing delicious, full-bodied, flavorful brewing. Designed with our patented Thermal Flavor Extraction system for consistent temperature, even saturation, and calibrated brewing cycles.
- EASY TO USE: Compatible with both pods and grounds, this single cup coffee maker features intuitive, one-touch controls to easily brew the exact cup you're looking for. Choose from 4 different brew types and multiple cup sizes.
- ICED COFFEE MAKER: Features 4 brew styles, including Over Ice, perfect for a refreshing cold brew on a hot summer day. Classic, Rich, and Specialty offer versatile choices ranging from medium to bold and concentrated.
- MILK FROTHER: Use the Specialty brew style to create a rich coffee concentrate, then add creamy frothed milk for cafe-style lattes, mochas, cappuccinos, and more. The built-in milk frother easily folds away for a convenient, space-saving profile.
- DESIGNED FOR CONVENIENCE: Brew cups anywhere from 6 to 24 oz. Adjustable drip tray easily fits travel mugs for busy commuters. 56 oz removable reservoir delivers simple and mess-free refilling. Comes with built-in frother, Ninja Scoop, removable brew basket, Ninja pod adapter, and permanent filter.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
