They are both great for cooking food but their approach -- to heating -- is quite different.
Toaster Ovens vs Countertop Ovens: What's the difference?
Cook - Tasting Table
Cook everything from meals to snacks faster and more evenly with the Oster Convection 4-Slice Toaster Oven. It offers 5 cooking functions - toast, bake, broil, turbo, and warm. Turbo Convection Heat Technology speeds up cooking time and browns food more consistently than conventional ovens. This Oster toaster oven features independent dial controls, so you can adjust temperature, cooking function, and timer to choose the optimal settings for your meal.
Oster Convection 4-Slice Toaster Oven Black
Air Fryer Vs. Convection Oven: What's The Difference?
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Air Fryers vs Convection Ovens What's the Difference?
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Oster® Compact Countertop Oven With Air Fryer, Stainless Steel
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Toaster vs. Toaster Oven