You love grilled food but hate the hassle of charcoal, propane, or cleaning a greasy outdoor grill. Maybe you live in an apartment with no balcony, or the weather limits your cookouts. The Ninja Foodi Smart XL Grill promises to deliver authentic sear marks and smoky flavor indoors, with smart technology that takes the guesswork out of doneness. In this review, we evaluate the Ninja Foodi Smart XL 6-in-1 Indoor Grill & Air Fryer (model FG551) and compare it with two other popular Ninja grills: the outdoor Ninja Woodfire ProConnect Premium XL BBQ Grill and the indoor Ninja Sizzle Pro XL 20″ Griddle & Grill. We also share our buying guide to help you choose the right grill for your kitchen. For more Ninja grill comparisons, check out our Ninja Foodi 10-in-1 reviews.
Pros
- Smart Cook System with thermometer ensures perfectly cooked proteins at your desired doneness level every single time
- XL capacity allows cooking for large families or meal prepping multiple servings simultaneously
- Authentic indoor grilling with 500°F cyclonic air creates impressive sear marks and BBQ flavor without outdoor space
- 6-in-1 functionality replaces multiple kitchen appliances, saving counter space and money
- Highly rated by thousands of verified buyers who praise consistent cooking results and ease of use
Cons
- Larger footprint and weight may require significant counter space in smaller kitchens
- Premium price point is higher than single-function air fryers or grills
- Requires regular cleaning of grill grate and interior components to maintain optimal performance
The Ninja Foodi Smart XL is an all-in-one indoor cooking solution that combines a high-powered grill with air frying and five additional cooking methods. This appliance is designed for home cooks who want the convenience of indoor grilling without sacrificing authentic BBQ flavor, making it perfect for apartment dwellers, busy families, and anyone tired of weather-dependent outdoor cooking.
The standout feature is undoubtedly the Smart Cook System paired with its dual-sensor thermometer. With 4 protein presets and 9 doneness levels, this technology takes the guesswork out of cooking steaks, chicken, fish, and pork. The 500°F cyclonic grilling technology delivers impressive char marks and sizzle while the XL capacity fits up to 6 steaks or 24 hot dogs at once, making it genuinely practical for family dinners and meal prepping. Real-world performance consistently delivers restaurant-quality results that justify the investment.
Build quality is solid with a professional black and silver finish that fits modern kitchen aesthetics. The dual cooking surfaces and smart temperature controls feel premium and durable. The grill grate is sturdy, and the overall construction suggests this appliance will handle years of regular use without performance degradation.
The main drawback is the substantial counter space required and the need for regular cleaning to maintain performance. The learning curve for maximizing all 6 functions is minimal thanks to clear preset options, but some users may find the initial investment steep compared to single-function alternatives.
The Ninja Foodi Smart XL delivers exceptional value for households seeking versatile, reliable indoor cooking. If you want perfect proteins, love air frying, and need XL capacity without multiple appliances, this is a top-tier choice that consistently exceeds expectations.
The Smart Cook System is engineered to eliminate cooking failures. The dual-sensor thermometer continuously monitors both air temperature and food internal temperature, automatically adjusting heat for perfect results. With 4 protein presets (beef, chicken, pork, fish) and 9 doneness levels ranging from rare to well-done, you simply select your protein and desired doneness, then let the system handle the rest.
This feature is particularly valuable for busy cooks who struggle with timing or temperature guessing. Whether you're cooking a rare steak or ensuring chicken reaches safe temperatures, the Smart Cook System removes uncertainty. The thermometer probe is food-safe and easy to insert, and the system alerts you when your meal reaches target doneness for perfectly cooked results every time.
Beyond grilling, this appliance functions as a complete cooking center. The 6-in-1 modes include: Grill for char-marked proteins, Air Fry for crispy foods with minimal oil, Air Crisp for enhanced crispiness, Roast for even cooking of vegetables and meats, Bake for breads and desserts, Broil for quick finishing, and Dehydrate for healthy snacks and jerky.
This versatility means you can replace your outdoor grill, air fryer, toaster oven, and dehydrator with a single countertop appliance. Cook burgers for lunch, air fry wings for dinner, and dehydrate fruit for snacks all from one machine. The XL capacity ensures you can handle multiple dishes simultaneously, making weeknight meal prep efficient and straightforward.
Pros
- Smart Cook System with thermometer ensures perfectly cooked proteins at your desired doneness level every single time
- XL capacity allows cooking for large families or meal prepping multiple servings simultaneously
- Authentic indoor grilling with 500°F cyclonic air creates impressive sear marks and BBQ flavor without outdoor space
- 6-in-1 functionality replaces multiple kitchen appliances, saving counter space and money
- Highly rated by thousands of verified buyers who praise consistent cooking results and ease of use
Cons
- Larger footprint and weight may require significant counter space in smaller kitchens
- Premium price point is higher than single-function air fryers or grills
- Requires regular cleaning of grill grate and interior components to maintain optimal performance
The Ninja Foodi Smart XL is an all-in-one indoor cooking solution that combines a high-powered grill with air frying and five additional cooking methods. This appliance is designed for home cooks who want the convenience of indoor grilling without sacrificing authentic BBQ flavor, making it perfect for apartment dwellers, busy families, and anyone tired of weather-dependent outdoor cooking.
The standout feature is undoubtedly the Smart Cook System paired with its dual-sensor thermometer. With 4 protein presets and 9 doneness levels, this technology takes the guesswork out of cooking steaks, chicken, fish, and pork. The 500°F cyclonic grilling technology delivers impressive char marks and sizzle while the XL capacity fits up to 6 steaks or 24 hot dogs at once, making it genuinely practical for family dinners and meal prepping. Real-world performance consistently delivers restaurant-quality results that justify the investment.
Build quality is solid with a professional black and silver finish that fits modern kitchen aesthetics. The dual cooking surfaces and smart temperature controls feel premium and durable. The grill grate is sturdy, and the overall construction suggests this appliance will handle years of regular use without performance degradation.
The main drawback is the substantial counter space required and the need for regular cleaning to maintain performance. The learning curve for maximizing all 6 functions is minimal thanks to clear preset options, but some users may find the initial investment steep compared to single-function alternatives.
The Ninja Foodi Smart XL delivers exceptional value for households seeking versatile, reliable indoor cooking. If you want perfect proteins, love air frying, and need XL capacity without multiple appliances, this is a top-tier choice that consistently exceeds expectations.
The Smart Cook System is engineered to eliminate cooking failures. The dual-sensor thermometer continuously monitors both air temperature and food internal temperature, automatically adjusting heat for perfect results. With 4 protein presets (beef, chicken, pork, fish) and 9 doneness levels ranging from rare to well-done, you simply select your protein and desired doneness, then let the system handle the rest.
This feature is particularly valuable for busy cooks who struggle with timing or temperature guessing. Whether you're cooking a rare steak or ensuring chicken reaches safe temperatures, the Smart Cook System removes uncertainty. The thermometer probe is food-safe and easy to insert, and the system alerts you when your meal reaches target doneness for perfectly cooked results every time.
Beyond grilling, this appliance functions as a complete cooking center. The 6-in-1 modes include: Grill for char-marked proteins, Air Fry for crispy foods with minimal oil, Air Crisp for enhanced crispiness, Roast for even cooking of vegetables and meats, Bake for breads and desserts, Broil for quick finishing, and Dehydrate for healthy snacks and jerky.
This versatility means you can replace your outdoor grill, air fryer, toaster oven, and dehydrator with a single countertop appliance. Cook burgers for lunch, air fry wings for dinner, and dehydrate fruit for snacks all from one machine. The XL capacity ensures you can handle multiple dishes simultaneously, making weeknight meal prep efficient and straightforward.
Buying Guide: What to Look for in an Indoor Grill
Before you buy an indoor grill, consider these key factors. Each one affects how well the grill fits your cooking habits and kitchen space.
Cooking Capacity and Versatility
Think about how many people you usually cook for. The Ninja Foodi Smart XL Grill offers an XL capacity that fits up to six steaks or 24 hot dogs, making it great for families. The Ninja Sizzle Pro XL goes even bigger with a 20-inch griddle that can hold 10+ burgers. If you often cook for a crowd, the Sizzle Pro XL might be your best bet. But if you want a single appliance that also air fries, roasts, and dehydrates, the Foodi Smart XL is more versatile. For more on air fryer combos, see our Air Fryers category page.
Smart Features and Temperature Control
The Ninja Foodi Smart XL Grill stands out with its Smart Cook System and built-in thermometer. It uses protein presets and nine doneness levels, from rare to well done, so you never overcook or undercook your food. The Ninja Woodfire ProConnect goes further with app connectivity that lets you monitor and control two different proteins from your phone. If you love tech and precision, these smart features are a game changer. The Ninja Sizzle Pro XL uses ProTemp IQ for precise temperature dialing, but lacks the doneness presets.
Indoor vs. Outdoor Use
Decide where you will cook. The Ninja Foodi Smart XL Grill and the Ninja Sizzle Pro XL are designed for indoor countertop use, with smokeless technology and easy cleanup. The Ninja Woodfire ProConnect is an outdoor grill that uses real wood pellets for smoky flavor, but it is weather resistant and can stay outside year-round. If you want the authentic BBQ experience without the smoke inside, the Woodfire is your pick. For indoor grilling that still delivers char marks, the Foodi Smart XL uses cyclonic grilling technology at 500°F. For more indoor grill reviews, read our Cuisinart air fryer toaster oven with grill reviews.
Ease of Cleaning and Maintenance
Nobody wants to spend hours scrubbing a grill. The Ninja Sizzle Pro XL features ceramic nonstick plates that are PFAS free and easy to wipe clean. The Ninja Foodi Smart XL has a nonstick grill grate and a removable grease tray for quick cleanup. The Ninja Woodfire ProConnect requires more care because of the pellet system, but its components are also dishwasher safe. Consider your tolerance for maintenance when choosing.
Final Thoughts
After evaluating all three models, we recommend the Ninja® Foodi® Smart XL 6-in-1 Indoor Grill & Air for anyone who wants a versatile indoor cooker that replaces multiple appliances and delivers perfect doneness every time. If you love outdoor cooking but want the convenience of smart monitoring and real wood flavor, the Ninja Woodfire ProConnect Premium XL BBQ Grill is your best choice. Both grills are backed by years of Ninja innovation and thousands of satisfied users. For a deeper dive into Ninja grill performance, check our Ninja Foodi grill reviews.
Frequently Asked Questions
Can the Ninja Foodi Smart XL Grill really cook a steak to medium rare without a thermometer?
Yes, the built-in Smart Cook System with dual sensor thermometer automatically adjusts the cooking time and temperature based on the protein preset you choose. You just select the doneness level, and the grill handles the rest. In 2026, this technology is more reliable than ever.
Does the Ninja Foodi Smart XL Grill produce smoke indoors?
It generates less smoke than a traditional outdoor grill, but some smoke is normal when searing at high heat. The grill includes a ventilated lid that helps reduce splatter and smoke, making it suitable for indoor use. For best results, use it under your range hood or near an open window.
How does the Ninja Foodi Smart XL compare to the Ninja Sizzle Pro XL?
The Foodi Smart XL is a 6-in-1 appliance that grills, air fries, roasts, bakes, broils, and dehydrates. The Sizzle Pro XL is a dedicated indoor griddle and grill with interchangeable plates and a larger cooking surface. If you want multifunctionality, go with the Foodi Smart XL. If you mostly cook large batches of burgers and breakfast, the Sizzle Pro XL is better. For more on choosing between models, see our buying guides.
Is the Ninja Woodfire ProConnect worth the extra cost?
If you love the taste of real wood smoke and want the convenience of app control, yes. It uses wood pellets to infuse authentic BBQ flavor, and the dual thermometer system lets you cook two different proteins to separate doneness levels. It is a premium outdoor grill that outperforms many traditional smokers. In 2026, it remains one of the top-rated smart grills for outdoor cooking.
For more tips on grilling and cooking, explore our Best Bread Machine Recipes article for side dishes that pair perfectly with grilled meats.
