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Which Single-Serve Coffee Maker Fits Your Brew Routine?

The PB051ST is the more flexible documented setup: SharkNinja lists grounds and pods, includes a permanent filter and pod adapter, and offers four brew styles with grounds sizes up to 24 ounces. K-Express is a focused K-Cup brewer with 8-, 10-, and 12-ounce buttons and Strong Brew; it can also use grounds with the separately sold My K-Cup filter, so it is not pods-only.

Published by Pickoryx · Published 2026-10-16

Source checked 2026-10-16 05:27 UTC

Products compared

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The buying question

Do you want grounds brewing and broader drink options included, or is the K-Express pod-and-button workflow enough if grounds require an add-on?

The PB051ST includes its grounds filter and pod adapter and documents more brew sizes and styles plus a fold-away frother; K-Express centers on three K-Cup sizes and Strong Brew, with grounds supported through a separately sold My K-Cup filter.

Quick verdict

Choose Keurig K-Express Single-Serve Coffee Maker if

  • Your usual cup is an 8-, 10-, or 12-ounce K-Cup brew and Strong Brew is the extra control you want.
  • You are comfortable purchasing My K-Cup separately when you want to brew grounds.
View Keurig K-Express Single-Serve Coffee Maker on AmazonPaid link
When the recommendation changes
  • If you do not use grounds, extra sizes, the listed brew styles, or milk frothing, the Ninja's added options may not matter to your routine.
  • If a built-in frother is essential, confirm the current exact K-Express configuration; the reviewed Keurig materials do not establish that feature for this model.

The differences that matter

Brew Input And Included Accessories

Ninja PB051ST Single-Serve Pods & Grounds Coffee Maker (Stone)

Brews coffee grounds and pods; PB051ST in-box list includes a permanent filter, Ninja pod adapter, scoop, and brew basket.[1]

Keurig K-Express Single-Serve Coffee Maker

K-Express guide shows its K-Cup pod workflow and says it is compatible with the My K-Cup Universal Reusable Coffee Filter for grounds, sold separately.[3]

What this changes: If you want to use your own grounds immediately, PB051ST's published in-box parts cover that workflow; K-Express grounds brewing requires adding a separate My K-Cup filter.[1, 3]

Best fit: Ninja PB051ST Single-Serve Pods & Grounds Coffee Maker (Stone)View Ninja PB051ST Single-Serve Pods & Grounds Coffee Maker (Stone) on AmazonPaid link

Brew Sizes And Milk Drink Workflow

Ninja PB051ST Single-Serve Pods & Grounds Coffee Maker (Stone)

PB051ST lists four styles—Classic, Rich, Over Ice, and Specialty—pod sizes of 6, 8, 10, or 12 ounces, grounds sizes of 6, 8, 10, 12, 14, 18, or 24 ounces, and an included fold-away frother.[1]

Keurig K-Express Single-Serve Coffee Maker

K-Express lists 8-, 10-, and 12-ounce cup sizes and Strong Brew. The reviewed Keurig sources do not establish an integrated frother for this model.[2, 3]

What this changes: The Ninja's documented sizes and styles fit shoppers who want more than a standard K-Cup portion or an included frothing step. K-Express documents three cup buttons and Strong Brew; its milk-frothing status remains unverified here.[1, 2, 3]

The better fit depends on your priorities

Best for your routine

Brewing either grounds or pods without first buying a separate grounds filter

Best fit: Ninja PB051ST Single-Serve Pods & Grounds Coffee Maker (Stone)

Based on listed features, not comparative testing.

The PB051ST page lists both input types and its in-box permanent filter and pod adapter; the K-Express guide requires separately sold My K-Cup for grounds.

View Ninja PB051ST Single-Serve Pods & Grounds Coffee Maker (Stone) on AmazonPaid link

Making a regular K-Cup in one of three documented cup sizes, with Strong Brew available

Best fit: Keurig K-Express Single-Serve Coffee Maker

Based on listed features, not comparative testing.

K-Express offers 8-, 10-, and 12-ounce buttons and Strong Brew. Choose it when those controls match your routine and the Ninja's additional options would go unused.

View Keurig K-Express Single-Serve Coffee Maker on AmazonPaid link

Value and trade-offs

One or both observed offers have eligibility conditions, so no unrestricted price difference is shown.

Compare current offers against features you expect to use: included grounds brewing, additional sizes and styles, and a frother on the Ninja versus the K-Express's three cup choices and Strong Brew. Displayed offers can change.

The authored analysis did not assess price history; no timing recommendation is made.

Limitations

  • This is a feature-fit comparison, not a taste, temperature, speed, or reliability test.
  • Keurig's reviewed K-Express materials confirm My K-Cup compatibility for grounds and that the reusable filter is sold separately; the current exact retail bundle contents were not independently confirmed.
  • The reviewed Keurig materials do not establish whether an integrated frother is included or compatible with the assigned K-Express configuration; do not treat that gap as proof it lacks one.
  • Current offer cards may change; no Buy Now or Wait timing recommendation is made.

Questions shoppers ask

Is the Keurig K-Express pods-only?

No. Keurig says K-Express is compatible with the My K-Cup Universal Reusable Coffee Filter so it can brew ground coffee, but that filter is sold separately.

What cup sizes can each brewer make?

SharkNinja lists 6, 8, 10, or 12 ounces for pods and 6, 8, 10, 12, 14, 18, or 24 ounces for grounds on PB051ST. Keurig lists 8-, 10-, and 12-ounce sizes for K-Express.

Does K-Express include a milk frother?

The Keurig materials reviewed for K-Express do not confirm an integrated frother. If essential, check the exact current model and bundle before purchase. SharkNinja lists a fold-away frother in the PB051ST box.

Methodology and sources

Compared documented input and accessory paths, serving-size and brew-style choices, and what is known or remains unconfirmed about integrated frothing. No taste or performance outcome was inferred from feature lists.

Research assistance helped organize the manufacturers' published information; no hands-on testing was performed.

View 3 sources
  1. 1.Ninja® Single-Serve Pods & Grounds Specialty Coffee Maker StoneSharkNinja · Official specifications · Source checked 2026-10-16 05:27 UTC
    Evidence used on this page
    • Product details and In the Box, lines 87-120; model PB051ST, Stone: Identifies model PB051ST in Stone; describes grounds and pod use, brew styles, pod and grounds size options, built-in fold-away frother, and lists permanent filter, pod adapter, scoop, brew basket and frother in the box.
  2. 2.K-Express™ Single Serve Coffee MakerKeurig · Official specifications · Source checked 2026-10-16 05:27 UTC
    Evidence used on this page
    • Product highlights, lines 136-149: K-Express product page identifies the model and lists 8-, 10-, and 12-ounce cup sizes and Strong Brew.
  3. 3.K-Express Use & Care GuideKeurig · Official specifications · Source checked 2026-10-16 05:27 UTC
    Evidence used on this page
    • Coffee Maker Features, page 2: simple button controls, My K-Cup universal filter compatibility/sold separately, Strong Brew, cup sizes; pod setup workflow, page 1: K-Express Use & Care Guide documents a K-Cup pod workflow, three cup sizes and Strong Brew, and says the model is compatible with the separately sold My K-Cup Universal Reusable Coffee Filter for brewing ground coffee.

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