Ninja Double Stack XL Air Fryer, Vertical Dual Drawer, SL400UKCP

The Ninja Double Stack XL takes fourth place in our air fryer ranking, and it solves the one real problem with dual-zone machines: their width. Instead of two drawers side by side, it stacks them, so it takes far less worktop than the Foodi MAX for the same twin-zone cooking. Two drawers plus two included meal racks give four cooking levels, and the real dimensions on its listing, about 47 by 28 by 38.5 centimetres, confirm the trade: it is narrow and deep but tall, so it needs headroom rather than width. It holds 4.6 stars across a healthy pool of 2,748 ratings.

The "9.5L" is spread across the stacked drawers and racks, not pooled into one space, so like every dual it is built for cooking several things at once rather than one large item. Its spec sheet is mostly clean — 2470W, 240V, dishwasher-safe parts — with one giveaway: the maximum temperature is listed as "450 Degrees Fahrenheit", the United States unit, on a UK listing where everything else is in Celsius (450°F is about 232°C). At around GBP 190 it costs the same as the wider Foodi MAX, so you choose it for the vertical footprint, not to save money. Everything here comes from the Amazon listing rather than our own testing.