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Ninja ST101 vs SP151: slot toaster or flatbed flip oven?

The Ninja Foodi ST101 and the Ninja Flip Toaster Oven & Air Fryer SP151 both use a pivoting body, but they answer different counter questions. ST101 begins as a lever-operated two-slice toaster and turns into a compact tray oven. SP151 is a horizontal air-fry oven that can be tipped upright for storage after it cools. A “flip” label alone does not tell you which one fits your breakfast, snacks or storage routine.

Start with the position you will use most

Choose the ST101 review if your everyday task is toast or bagels in a slot, and you want a small Bake/Broil/Reheat option in the same appliance. It lists six programs: Toast, Bagel and Defrost in upright toaster position; Bake, Broil and Reheat after flipping down into horizontal oven position. The manufacturer says it accepts up to two thick bread slices. Those modes are sequential: the same cavity changes orientation rather than providing an oven and toaster that can cook together.

Choose the SP151 review if you want Air Fry and Dehydrate as well as the more familiar horizontal toaster-oven layout. Its eight listed programs are Air Fry, Air Roast, Bake, Broil, Pizza, Toast, Bagel and Dehydrate. SharkNinja gives capacity examples including up to six bread slices and a 12-inch pizza. It stays horizontal while cooking, then flips up only after it has cooled. This is not the same as ST101's upright slot-toaster position.

Compare the jobs, not just the number of modes

The ST101's main advantage is a different kind of toast access: bread lowers into a slot, and the maker documents two-slice use. The SP151 toasts on its horizontal oven rack, lists a larger toast batch and also provides Air Fry and Dehydrate. Neither is a dual-zone oven. The ST101 has a small baking tray; SP151 uses a rack, sheet pan and air-fry basket. More accessories can make the SP151 useful for broader meal prep, but they also leave more pieces to clean. The ST101 has fewer pieces, though its rear crumb tray is not fully removable.

Capacity claims need care. ST101's maker lists up to two thick slices, 16 chicken nuggets, an 8-inch open-face sandwich or two full-size pizza bagels as examples; SP151's listed slice and pizza examples do not guarantee that a particular dish fits either interior. Neither listing gives a cubic-foot cavity value here. Measure your dish and account for handles, air circulation and clearance rather than translating an example into a universal fit promise.

The counter-fit problem is different for each flip

ST101's manufacturer lists 16.54 inches long, 6.7 inches wide and 8.42 inches high. Its exact listing does not map those three labels to the usable footprint in each position, so measure the appliance upright and laid down. The ST100 Series guide requires at least 10 inches of overhead space and 4 inches on all sides, and says not to operate the appliance under cabinets or in an enclosed space. It also prohibits extension-cord use.

For SP151, the manufacturer lists a 19.13-inch front width in its horizontal cooking position and says the flipped storage position uses 50% less counter space. The SP150-series guide requires adequate air circulation above and on all sides but the reviewed setup guidance does not provide a numeric clearance. Its advertised storage reduction is not a smaller cooking footprint. In either case, make separate measurements for cooking, loading a hot tray, cooling and parking. Do not move a hot appliance to free counter space.

How the finder should change your choice

Make slot-style toasting a required answer only if that exact operation matters; the finder then distinguishes ST101 from flatbed oven toast presets. Requiring Air Fry or Dehydrate instead points away from ST101 and toward SP151 or other reviewed models with those named programs. If two separately scheduled meals are essential, compare the Ninja DCT601 Double Stack rather than treating either flip design as two ovens. If the appliance must fit beneath cabinetry, check the ST101 guide's placement restriction before relying on its listed size.

One final availability note: SharkNinja's exact ST101 product page displayed out of stock when checked on October 23, 2026. That does not establish permanent discontinuation or current third-party stock. For a used or open-box unit, verify the ST101 model label and the bake tray and crumb tray package pieces. For either model, confirm exact model, accessories, seller terms and condition before purchase.

Read the practical SP151 flip-away counter guide, then compare the model reviews for the ST101, SP151 and DCT601.