The catch
Breville Smart Oven Air Fryer
It comes without an integrated food probe or probe-driven stopping.
Side by side
Breville BOV860 Air Fryer vs Ninja DT551 Pro Cook: Breville adds slow cooking in less height, Ninja ends a cook from its probe
Quick verdict
Go with Breville BOV860 if you want a lower six-slice oven with Slow Cook and conventional time-and-temperature control. Go with Ninja DT551 if an integrated food thermometer, nine-slice toast and supported two-level cooking are more useful to you. Both ovens air fry, yet ending a supported cook from a connected probe is something only the selected Ninja package can do.
Before you buy
Why, and what it costs you
What a food probe measures is beyond the oven thermostat
The thermometer included with DT551 reads the food itself and can end a supported cook based on that reading. Temperature control on BOV860 gives no internal-food feedback, so a separate thermometer remains your own monitoring tool.
Where this comes from
The manual from Ninja covers plugging in the probe, selecting doneness and automatic heating shutoff. No integrated food probe is listed for BOV860.
The catch
Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
It stands 2.45 inches taller.
Breville Smart Oven Air Fryer
- Why pick it
- Body height stays down at 10.9 inches
- The dedicated Slow Cook mode gets used
- The catch
- It comes without an integrated food probe or probe-driven stopping.
Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
- Why pick it
- Suitable proteins get cooked with the included Pro Cook thermometer
- Supported two-level recipes use the two supplied racks and pans
- The catch
- It stands 2.45 inches taller.
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What this page compares
Roast doneness, two-level cooking, toast loads and height are where Breville BOV860 and Ninja DT551 are compared. Pick the oven that matches your meal routine.
Go with Breville BOV860 if you want a lower six-slice oven with Slow Cook and conventional time-and-temperature control. Go with Ninja DT551 if an integrated food thermometer, nine-slice toast and supported two-level cooking are more useful to you. Both ovens air fry, yet ending a supported cook from a connected probe is something only the selected Ninja package can do.
Which one fits
Pick the situations that sound like you
I want the oven to shut off when food reaches a target temperature
The connected probe and supported automatic stopping come only with DT551.
- Breville Smart Oven Air Fryer
- Not suitable
- Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
- Better fit
Eight slices of toast is my routine
Ninja's nine-slice rating covers eight, which is more than BOV860's six-slice rating.
- Breville Smart Oven Air Fryer
- Caution
- Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
- Better fit
A dedicated Slow Cook mode is what I want
Slow Cook is on the BOV860 list but not on DT551's ten-function list.
- Breville Smart Oven Air Fryer
- Better fit
- Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
- Not suitable
I prefer an appliance body under 12 inches in height
Height is 10.9 inches for BOV860 and 13.35 for DT551, before additional clearance.
- Breville Smart Oven Air Fryer
- Better fit
- Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
- Not suitable
Separate cooking temperatures are needed for two dishes at once
One cooking cavity is all each has, so neither can provide two independent temperature zones.
- Breville Smart Oven Air Fryer
- Not suitable
- Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
- Not suitable
In practice
Differences you will notice
What a food probe measures is beyond the oven thermostat
The thermometer included with DT551 reads the food itself and can end a supported cook based on that reading. Temperature control on BOV860 gives no internal-food feedback, so a separate thermometer remains your own monitoring tool.
How we worked this out
The manual from Ninja covers plugging in the probe, selecting doneness and automatic heating shutoff. No integrated food probe is listed for BOV860.
Breakfast capacity goes up by three slices
Against BOV860's six-slice rating, DT551's nine-slice rating is 50% higher. For seven to nine slices that can avoid a second nominal load, though it does not establish evenness or toast quality.
How we worked this out
Fit in practice depends on bread dimensions. 9 - 6 = 3 slices, and 3 / 6 = 50%.
One oven environment is still shared by two cooking levels
Two racks and pans plus a supported two-level setting come with DT551. More compatible food can cook in the same cycle, but this does not create independently controlled chambers for two recipes that need different temperatures.
How we worked this out
The manual's 2 LEVEL button on DT551, a single-cavity oven, changes the supported rack recommendations and does not provide separate cavity temperatures.
Option A
Breville, BOV860BSS1BUS1
Smart Oven Air Fryer
This mid-size Breville offers eleven programs, a cavity that takes a 13-inch pizza and forceful super-convection airflow.
- Best for
- Body height stays down at 10.9 inches
Facts we checked
- Integrated food thermometer: None included
- Toast capacity: 6 slices
- Supplied racks and pans: 1 wire rack and roasting pan
- Body height: 10.9 inches
Option B
Ninja, DT551
Prestige Smart XL Air Fryer Countertop Oven Pro Cook
A Pro Cook system that tracks food temperature at the appliance comes with this two-level XL oven from Ninja.
- Best for
- Suitable proteins get cooked with the included Pro Cook thermometer
Facts we checked
- Integrated food thermometer: Wired Pro Cook thermometer
- Toast capacity: 9 slices
- Supplied racks and pans: 2 wire racks and 2 sheet pans
- Body height: 13.35 inches
Spec by spec
Where they really differ
| Spec | Breville Smart Oven Air Fryer | Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook | In practice |
|---|---|---|---|
| Integrated food thermometer | None included | Wired Pro Cook thermometer | In its supported thermometer workflow, Ninja can monitor food temperature and stop heating. |
| Toast capacity | 6 slices | 9 slices | Three nominal toast positions are added by Ninja. |
| Supplied racks and pans | 1 wire rack and roasting pan | 2 wire racks and 2 sheet pans | DT551 comes equipped for the two-level cooking modes it supports. |
| Body height | 10.9 inches | 13.35 inches | Before operating clearance is added, the taller Ninja requires more vertical space. |
| Dedicated Slow Cook | Yes | Not in the listed functions | The documented long-cook mode comes from Breville. |
| Dedicated Dehydrate | Not in the listed functions | Yes | A named dehydration mode is added by Ninja. |
Trade-offs
What each pick costs you
With Breville Smart Oven Air Fryer
- Toast capacity of six slices falls below Ninja's nine-slice rating.
With Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
- A dedicated Slow Cook mode is missing from its ten listed functions.
Change of plan
When the answer changes
My priority is doneness driven by a probe
Go with Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook. The integrated thermometer and supported automatic stopping are part of DT551.
Slow Cook and a lower body matter more
Go with Breville Smart Oven Air Fryer. Slow Cook comes with BOV860, which is also shorter.
Two dishes of mine need independent temperatures
Neither model fits. Using two levels in one cavity does not give you two independently controlled ovens.
Decision guide
How to decide
A lower six-slice oven with Slow Cook and conventional time-and-temperature control describes the Breville BOV860. Ninja DT551 earns its place when you would put an integrated food thermometer, nine-slice toast and supported two-level cooking to better use. Air frying is common to both, but a connected probe that ends a supported cook belongs only to the selected Ninja package.
Ask yourself if roast monitoring matters
For suitable proteins, the probe on the DT551 is a useful distinction, since it measures inside the food instead of only controlling chamber heat. Correct insertion and an independent food-safety check still matter. If you already manage doneness with your own thermometer, the BOV860 is a reasonable fit.
Fit the oven to your usual load
Larger advertised toast loads and supported two-level recipes come with the Ninja package. Breville offers a shorter body and a dedicated Slow Cook mode. Because those are different practical benefits, base the choice on your usual dinner or breakfast. A ranking by function count will not settle it.
Give the whole appliance enough room
A 2.45-inch difference in body height is clear, though neither height counts as installation clearance. Measure the spot you have in mind, keeping ventilation, the door opening and safe pan removal in view. An appliance that technically fits can still be awkward or unsafe to operate under a low shelf.
What this page can’t tell you
- Cooking, temperature-accuracy and energy tests were not carried out. Even with a connected probe, you still need to supervise and confirm that the food has reached a safe temperature.
By the numbers
What the data shows
What we found across the countertop ovens we compare, plus the checked facts behind each finding.
Show the facts and the math
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Breville Smart Oven Air Fryer |
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| Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook |
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Ready to buy
See today’s price and what owners say
Open either model on Amazon for the current price, customer reviews and delivery options.
Breville Smart Oven Air Fryer
Body height stays down at 10.9 inches
See price & reviews on AmazonNinja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
Suitable proteins get cooked with the included Pro Cook thermometer
See price & reviews on AmazonEach link opens in a new tab.
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