Both cook two foods at once, but they solve it differently. Cosori’s TWINFRY uses a removable divider to switch between one 9-quart basket and two 4.5-quart zones. Ninja’s DualZone (DZ401) uses two fixed, permanently separate baskets totaling 10 quarts.
Quick verdict
- Choose the TWINFRY if you want the flexibility to use one large basket sometimes and two zones other times.
- Choose the DZ401 if you always want two independent zones and prefer Ninja’s more established DualZone ecosystem.
How they compare
| Model | Capacity | Configuration | BestTop Score | |
|---|---|---|---|---|
 Cosori TWINFRY 9 QTRemovable divider |
9 qt total | 1×9qt or 2×4.5qt | 8.6 | Check price |
 Ninja Foodi DZ401 DualZoneFixed two-zone |
10 qt total | Fixed 2×5qt | 8.8 | Check price |
What’s actually different
Configuration flexibility. The TWINFRY’s divider is removable, so the same appliance serves as either a 9-quart single basket (for a whole chicken or big single dish) or two 4.5-quart zones. The DZ401’s two 5-quart baskets are permanently separate — you always have two zones, never one large one.
Total and per-zone capacity. The DZ401 has slightly more total capacity (10 qt vs 9 qt) and larger individual zones when split (5 qt vs 4.5 qt).
Brand ecosystem. Ninja’s DualZone line has a longer track record and more size options (DZ201, DZ401, DZ550); Cosori’s TWINFRY is a newer entrant in the flexible-format space.
Who should buy which
Buy the TWINFRY if you sometimes need one large basket and other times need two zones, and don’t want to own two separate appliances.
Buy the DZ401 if you always want two-zone cooking and prefer slightly more capacity per zone. See our full Ninja DZ401 review for more detail.
Frequently asked questions
Does removing the TWINFRY’s divider affect cooking performance? No — it’s a physical partition; airflow and heating work the same whether it’s inserted or removed.
Which has more capacity per zone when split? The DZ401’s 5-quart zones are larger than the TWINFRY’s 4.5-quart zones.
Can the TWINFRY’s divider be lost or damaged? It’s a removable part like any accessory — store it securely when not in use.
See our full Cosori TWINFRY review and best dual-basket air fryer guide across every brand.