Ninja SP151 vs SP351: Which Smart Toaster Oven Should You Choose?

When I first used both the Ninja SP151 and SP351, I was immediately impressed by how these flip toaster ovens combine versatility and space-saving design. Both models serve as a full-featured air fryer and toaster oven, letting me prepare everything from crispy fries to roasted chicken and baked pizzas with ease.

The SP151 is perfect for those who want a straightforward, reliable 8-in-1 appliance, while the SP351 takes it further with 13 functions, dual heat technology, and a smart thermometer for precision cooking. Both promise faster, healthier meals without cluttering the countertop.

Key Differences Between Ninja SP151 and SP351

While both ovens share an 1800-watt power output and stainless-steel construction, the SP351 brings some notable upgrades. The SP151 offers 8 cooking functions; Air Fry, Roast, Broil, Bake, Pizza, Toast, Bagel, and Dehydrate while the SP351 expands this to 13 functions, including Sear Crisp, Rapid Bake, Griddle, and Reheat.

The SP351 also features Dual Heat Technology with a SearPlate and rapid cyclonic air for restaurant-quality searing, plus a Foodi Smart Thermometer for perfect doneness. In contrast, the SP151 relies on Ninja’s OvenCrisp technology for even cooking and crisping, making it simpler yet effective for everyday meals.

Quick Specs Comparison Table: Ninja SP151 vs SP351 Toaster Oven Air Fryer

Feature	Ninja SP151	Ninja SP351
Cooking Functions	8-in-1 (Air Fry, Roast, Broil, Bake, Pizza, Toast, Bagel, Dehydrate)	13-in-1 (Air Fry, Sear Crisp, Rapid Bake, Frozen/Fresh Pizza, Griddle, Air Roast, Bake, Broil, Toast, Bagel, Dehydrate, Reheat)
Power/Wattage	1800 watts	1800 watts
Capacity	17.01 Cubic Inches	0.62 Cubic Feet
Dimensions	17.01″D x 15.75″W x 7.68″H	20.21″D x 15.33″W x 8.15″H
Control Type	Button Control	Touch Control
Special Features	Flip Up & Away for Storage, OvenCrisp Technology	Flip Up & Away, Dual Heat Technology, Foodi Smart Thermometer
Material	Stainless Steel	Stainless Steel
Included Accessories	Air Fry Basket, Sheet Pan, Wire Rack, Removable Crumb Tray	Air Fry Basket, Non-stick SearPlate, Wire Rack, Removable Crumb Tray, Smart Thermometer
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Detailed Comparative Analysis of Ninja SP151 Vs Sp351 Toaster Oven Air Fryer

Design

When I first saw both units, I was impressed by how thoughtfully they were designed for counter-space efficiency. The SP151 features the Flip Up & Away design, which allows me to store it neatly against my backsplash, reclaiming almost half of my countertop space. The stainless steel finish feels premium and sturdy.

The SP351 is slightly larger but also has a flip-away design. I love its sleek touch-control panel and the added height gives more room for larger dishes. Overall, both are compact yet roomy enough for family-sized meals, but the SP351 feels a bit more modern and refined.

Cooking Performance

Using these ovens, I immediately noticed how evenly they cook. The SP151’s OvenCrisp technology ensures consistent, edge-to-edge cooking, giving my chicken breasts a nice golden crisp.

The SP351, with its Dual Heat Technology, takes it a step further; the sear plate and rapid cyclonic air work together to give meats a restaurant-style sear and crispy pizza crust. Both ovens handle multiple cooking tasks efficiently, but I find the SP351 excels when I want faster, high-heat cooking with professional results.

Ease of Use

The SP151 is incredibly straightforward; the button controls are simple and intuitive. I can easily switch between cooking functions and adjust temperatures quickly. The SP351’s touch control panel feels more precise, and the built-in Smart Thermometer gives me confidence that my proteins are cooked perfectly without guesswork.

Both appliances preheat quickly and clean-up is hassle-free thanks to their nonstick baskets and trays. For hands-on cooking, I slightly prefer the tactile feedback of the SP151, but for tech-assisted precision, the SP351 wins.

Cooking Functions

The SP151 covers 8 versatile functions, including Air Fry, Roast, Broil, Bake, Pizza, Toast, Bagel, and Dehydrate. It’s perfect for everyday meals and occasional baking. The SP351 expands the possibilities with 13 functions; adding Sear Crisp, Rapid Bake, Griddle, Frozen/Fresh Pizza, and Reheat.

This makes it ideal for experimenting with more complex meals or multitasking multiple dishes simultaneously. I love that both allow for healthier cooking with less oil, but the SP351 offers the extra versatility when I want to try something more advanced.

Extra Features

The SP151’s energy efficiency and rapid hot air circulation make cooking fast and cost-effective. It’s easy to clean, and the included accessories cover all my basic needs. The SP351, however, goes further with the Smart Thermometer, dual heat system, and slightly larger capacity, making it feel like a professional-grade appliance. Both flip up and away to save space, but the SP351’s modern features give me more confidence in consistently perfect results for every meal.

Quick Specs Comparison Table: Ninja SP151 Vs Sp351 Toaster Oven Air Fryer

Feature	Ninja SP151	Ninja SP351
Functions	8-in-1	13-in-1
Capacity	17.01 Cubic Inches	0.62 Cubic Feet
Power	1800 watts	1800 watts
Control	Button Control	Touch Control
Temperature Range	85–450°F	Up to 500°F
Special Features	Flip Up & Away, OvenCrisp Technology	Flip Away, Dual Heat Technology, Smart Thermometer
Weight	18–20 lbs	21.5 lbs
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Ninja Sp151 Flip Toaster Oven & Air Fryer

Pros √

• Compact, space-saving flip design
• Energy efficient and fast cooking
• Simple, intuitive controls
• 8 versatile cooking functions
• Quick family meals in a small footprint

Cons x

• Limited advanced features compared to SP351
• Slightly smaller cooking capacity

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Ninja Sp351 Toaster Oven Air Fryer

Pros √

• 13-in-1 functions including Sear Crisp and Griddle
• Smart Thermometer for precise cooking
• Dual Heat Technology for restaurant-style results
• Larger interior capacity
• Modern touch control panel

Cons x

• Slightly bigger footprint
• More expensive than SP151

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Frequently Asked Questions

Q1: Can I cook multiple dishes at once in these ovens?
Yes, both SP151 and SP351 allow cooking multiple items simultaneously. The SP351’s Dual Heat Technology and extra height give it an edge for larger meals.

Q2: Are these ovens easy to clean?
Absolutely. Both come with nonstick baskets, trays, and removable crumb trays, making cleanup quick and effortless.

Q3: Which oven is better for crisping foods?
The SP351’s Dual Heat Technology gives a slightly superior crisp compared to the SP151, perfect for searing meats or pizza crust.

Q4: Do these ovens save countertop space?
Yes, both flip up and away to reclaim space, with SP151 being slightly more compact.

Conclusion: Ninja Sp151 vs Sp351 Toaster Oven Air Fryer – The Winner?

After using both ovens extensively, I feel the SP151 is ideal for everyday cooking, smaller families, and anyone who values simplicity, speed, and counter-space efficiency. It delivers consistent results and covers all essential cooking functions. The SP351, however, feels like a step up in versatility and precision.

Its Smart Thermometer, Dual Heat Technology, and expanded functions make it perfect for larger families, adventurous cooks, or anyone who wants professional-style results at home.

Personally, if I had to pick one for advanced cooking and maximum versatility, I’d go with the SP351, while the SP151 remains an excellent choice for fast, reliable, and compact cooking.