Ninja Kitchen Appliances Tested: Crispi, StaySharp and Creami Scoop and Swirl Reviewed

Introduction

Ninja kitchen appliances are everywhere right now, and the big question is simple: are they genuinely great, or just very well marketed? To find out, three of the brand’s most talked-about products were put through a hands-on first-use test: the Crispi glass air fryer, the StaySharp knife block, and the Creami Scoop and Swirl. Each one was taken straight out of the box and used to cook real food, with honest verdicts on whether each product earns its place on the counter.

Ninja Crispi Air Fryer: Full Power in a Portable Glass System

The Crispi makes a bold claim: the power of a full-sized air fryer in a portable glass cooking system. The standout feature is the glass container itself, which lets you watch your food as it cooks, much like looking through an oven door. The system also supports different sized glass containers, and the same containers you cook in can go straight into the fridge or freezer, something you would never do with an air fryer drawer.

It is a 4-in-1 machine with roast, air fry, re-crisp and keep warm modes, and the temperature range runs from 40 degrees up to 185 degrees C, with keep warm sitting at the bottom of that range. In testing, a batch of fish fingers and fries needed a toss partway through and longer than the initial 10 minute setting, which is normal for air frying but worth expecting.

The design realities are worth weighing up. The footprint is smaller than a full-sized air fryer, but the capacity is realistically one or two portions, so it is not built for batch cooking. The portability story is also nuanced: it is mains powered, not battery powered, so the use case is more like taking it to an Airbnb than cooking anywhere you like. The bulky fixed handles on the containers also divide opinion.

On the plus side, the glass is genuinely pleasant to use and the machine crisps well. At the price paid, 99.99, that is a fairly standard air fryer price. The honest verdict: it does everything it promises and feels well made, but it does not offer much above and beyond a traditional air fryer. Ratings came in at 3.5 and 4 out of 5, with the caveat that a bigger household needing two drawers would look elsewhere.

Ninja StaySharp Knife Block: Knives That Sharpen Themselves

The StaySharp is Ninja expanding beyond tabletop appliances. The set includes an 8-inch chef knife, an 8-inch bread knife, an 8-inch carving knife, a 5-inch utility knife, a 3.5-inch paring knife, plus scissors, all housed in a block with a built-in sharpener.

The sharpening angle is the real hook. Many people buy a knife set and then never sharpen it, complaining about bluntness without ever fixing it. Building the sharpener into the block bakes the habit in from the start: sharpen once every three months or so and these knives will serve you far better than any set left to go dull.

The blades are made of German steel, a durable and sharp mid-range choice for home cooks. The trade-off of that softer steel is more frequent sharpening compared to a harder Japanese knife, though it resists chipping and tolerates rougher handling. In use, the knives were super sharp out of the box, the curved bolster makes chopping more comfortable, and the bread knife’s shallower teeth caught bread cleanly instead of tearing it.

The sharpener uses a ceramic wheel rather than a V-groove sharpener, engaging the blade at the optimum angle, and Ninja claims the knives will stay sharp for 10 years with the recommended sharpening. The process is simple: slide the lever down, insert a clean knife until it hits the hard stop, then slide the lever up and down ten times. Two important lessons from testing: it is designed for Ninja knives only, as another brand’s knife would not even fit properly, and the sharpening genuinely restores a deliberately dulled edge, though it took more passes than expected.

One candid criticism: a professional cook would normally recommend buying individual knives only as needed, since half the knives in most blocks go unused. At 135 pounds for five knives and the block, the price is reasonable, and the built-in sharpening habit is a genuine win for the average cook. Both testers scored it 4 out of 5.

Ninja Creami Scoop and Swirl: Soft Serve at Home

The Creami Scoop and Swirl builds on the original Creami by bolting on a soft serve mechanism, and it covers ice cream, sorbet, mix-ins and six soft serve programs, making up to four cones from a single tub. The core technology works like a chef-grade Pacojet: you make your base, such as a custard, pour it into the tub and freeze it solid. Nothing touches the machine until the mixture is frozen, then a spinning head is lowered into the container to process it.

Testing with the honey soft serve gelato recipe from the manual produced genuinely smooth, dense results. The manual notes you can run it again if the texture is not smooth enough, and the difference between runs was dramatic: a second, shorter run produced a far lighter texture than the first, so do not assume longer processing is better. Dispensing through the soft serve lever is genuinely fun, and retracting the head afterwards is simple.

At 299 pounds, this is a lot of money for a machine that does one fairly niche thing, however well. The realistic buyers are food hobbyists who love making ice cream or smooth purees, and people with dietary needs: there is a protein setting and a light sugar setting, and simple homemade bases such as banana and milk turn out very well. It is also an appealing family treat machine, though the honest risk is that it gets used a few times and then sits in a cupboard.

Both testers scored it 4.5 out of 5, the highest of the three. It does exactly what it says it does, and the ice cream it makes is genuinely very good, as long as you understand you make and freeze the base yourself and the machine processes it.

Which Ninja Appliance Should You Buy?

Asked which of the three would earn a place in a dream kitchen with unlimited space and budget, both testers picked the same answer: the Creami Scoop and Swirl, and only that. But that came with a caveat about real-world kitchens: it is hard to justify the counter or cupboard space unless you will genuinely use it regularly.

As a practical summary, the Crispi suits people who want a compact air fryer for one or two portions and love the visibility of glass, the StaySharp is a strong all-round knife set for anyone who wants sharpening built into the routine, and the Scoop and Swirl is a premium treat for committed dessert makers and food hobbyists. None of these were gifted or sponsored, and longer-term six-month durability testing was planned to see how each one holds up in everyday use.

Conclusion

Ninja’s marketing reach is matched by mostly solid execution. The Creami Scoop and Swirl scored highest at 4.5 out of 5 for doing its niche job brilliantly, the StaySharp knife block earned a 4 for sharpness and smart design, and the Crispi landed between 3.5 and 4 as a good but not transformative air fryer. Match the product to the habit you will actually keep, and each one can earn its spot.