Bottom line
Buy the Cosori TurboBlaze if you want the least fussy path to crisp food. It heats quickly, the basket is a sensible size, and the controls do not ask you to learn a new language.
Weeknight cooks who want crisping power without a second oven.
You already have a convection toaster oven you use often.
This shortlist is about weeknight friction: basket size, preheat time, cleanup, and whether the appliance can stay useful without taking over the counter. If you are choosing between a dedicated drawer and a portable glass system, compare the Cosori TurboBlaze and Ninja Crispi before buying.
Published fit data
Measure before you make room.
Basket size, speed, and cleanup
These are editorial recommendations, not a lab score. Product details and availability can change. Links may earn us a commission without changing what you pay.
| Pick | Why it stands out | |
|---|---|---|
 Video: Cosori's own product video 01 Cosori TurboBlaze 6.0-Qt Best for most kitchens | Fast, even crisping. Quiet drawer and easy cleanup. | Check price on Amazon |
 Video: Instant's regional channel, filter replacement 02 Instant Vortex Plus ClearCook Best with a window | Useful viewing window. Strong reheat performance. | Check price on Amazon |
 Video: Ninja's own product video 03 Ninja Crispi Portable Glass Cooking System Best compact pick | Stores beautifully. Glass containers double as serveware. | Check price on Amazon |
Will it actually fit?
Dimensions and clearances come from the manufacturers’ product pages, manuals, and support documentation. “Not published” means the manufacturer did not give that number in the documents checked; we did not measure these appliances. Cabinet answers are conservative: a missing operating clearance or opening height is not treated as a yes.
| Detail | Exterior width × depth × height | Height with drawer fully open | Manufacturer rear / side clearance | Fits under an 18-inch upper cabinet? |
|---|---|---|---|---|
| Cosori TurboBlaze 6.0-Qt | 11.8 × 14.4 × 11.9 in, including handle (W × D × H) | Not published | Rear: 5 in; sides: Not published; overhead: Not published | No — safe overhead clearance is not published, so this cannot be confirmed under an 18-inch cabinet |
| Instant Vortex Plus ClearCook | 11.8 × 14.9 × 13 in (W × D × H) | Not published | Rear: at least 5 in; sides: at least 5 in; overhead: at least 5 in | No — the published 13 in height plus 5 in above already totals 18 in; drawer-open height is not published |
| Ninja Crispi Portable Glass Cooking System | 9.76 × 11.5 × 11.81 in (W × D × H) | Not published; removable container, not a hinged drawer | Rear: at least 6 in; sides: at least 6 in; overhead: at least 6 in | Yes — 11.81 in plus 6 in published overhead clearance is 17.81 in |
Manufacturer sources: Cosori TurboBlaze 6.0-Qt manufacturer source · Cosori TurboBlaze 6.0-Qt manufacturer manual · Instant Vortex Plus ClearCook manufacturer source · Instant Vortex Plus ClearCook manufacturer manual · Ninja Crispi Portable Glass Cooking System manufacturer source · Ninja Crispi Portable Glass Cooking System manufacturer manual
What we like
- Fast, even crisping
- Quiet drawer and easy cleanup
What to know
- No window into the basket
Choose the drawer you will actually use
The best air fryer here is the one that matches your usual portions and has a clear home near the outlet. A slightly larger basket is not an upgrade if it becomes another appliance to move before dinner.
Questions, answered
How big should an air fryer be for two people?
For two people, four to six quarts is the useful middle. The Cosori TurboBlaze and Instant Vortex Plus here are 6-quart-class models; a smaller basket can work if you usually cook one portion at a time.
How much clearance does an air fryer need under cabinets?
There is no single safe number across these three models. Cosori publishes 5 inches behind the TurboBlaze but does not publish a side or overhead figure; Instant publishes at least 5 inches above and around all sides; Ninja says at least 6 inches above and on all sides. Do not treat an unpublished overhead clearance as permission to use one under a cabinet.
Where does an air fryer vent steam?
Air fryers release hot air and steam through ventilation openings. The Ninja Crispi support page identifies the exhaust vent on the back; the Cosori and Instant manuals also direct you to keep ventilation openings clear. Treat the rear and the published clearance zone as hot and active, and keep your hands and face away from the exhaust.
Do I need an air fryer if I own a convection oven?
Not necessarily. The air fryer earns its place when you want speed, easy preheating, and a small basket you can shake.