# Ninja Double Stack XL SL401 Air Fryer (SL401)

**Category**: air-fryers | **Price**: ~$250–$300 | **Reviews referenced**: 300
**Last updated**: 2026-04-17
## One-line verdict
Ideal for families in small kitchens needing to cook multiple dishes at once, but requires frequent shaking for even cooking unlike wider dual-basket models.

## How it compares

- vs Ninja Double Stack XL SL400UK ($250–$270): SL401 wins on US market availability and feature refinements, SL400UK wins on lower price for near-identical stacked dual-zone performance
- vs Ninja Foodi DZ550 10 Qt ($200–$250): SL401 wins on compact vertical footprint for small kitchens, DZ550 wins on wider basket surface for more even crisping without frequent shaking
- vs Ninja Foodi DualZone XL DZ401 ($180–$200): SL401 wins on total capacity in smaller counter space, DZ401 wins on price and wider basket geometry for better airflow and even cooking
- vs Ninja DZ201 Foodi 8 Qt ($180–$220): SL401 wins on capacity and dual-zone cooking in tighter spaces, DZ201 wins on lower price and proven even cooking in wider basket format

## AI-summarized review themes

### Frequently Praised
- Compact stacked footprint fits under cabinets and frees counter space versus side-by-side models
- Cooks four foods simultaneously using racks and baskets for complete family meals
- Baskets and racks are dishwasher-safe and wipe clean without stuck-on residue

### Frequently Criticized
- Rear heating causes uneven front-to-back cooking, requiring mid-cook shaking or rotation
- Fan is noticeably louder than typical air fryers, disruptive in open kitchens
- Cook times run longer than expected, particularly when using both levels simultaneously

## Best for
families of 4+ in small kitchens, cooking multiple items simultaneously, replacing oven for daily meals

## Not for
people wanting set-it-and-forget-it even cooking, quiet operation in apartments, singles wanting compact single-basket

## Specifications
| Spec | Value |
| --- | --- |
| Cooking Capacity | 10 QT (2 x 5 QT baskets) |
| Cooking Functions | Air Fry, Air Broil, Roast, Bake, Reheat, Dehydrate |
| Wattage | 1690 W |
| Dimensions (L x W x H) | 20.83" x 13.07" x 17.72" |
| Weight | 25.13 lbs |
| Dishwasher Safe Parts | Baskets, crisper plates, racks |
| Smart Features | Smart Finish, Match Cook |
| Included Accessories | 2 crisper plates, 2 stacked meal racks |

## Data sources
- Estimated ~82 purchase reviews via Best Buy
- Estimated ~146 purchase reviews via Target
- Estimated ~74 purchase reviews via Walmart
- Review period: Apr 2025 - Apr 2026
- Sentiment confidence: high