The decision in plain terms
Choose Crispi 4-in-1 Portable Glass if you want the smaller advertised capacity. Choose 6.5-QT Air Fryer Pro XL if the larger advertised capacity fits your batch plan.
The key documented difference is advertised capacity. That difference does not establish a proportionate change in usable cooking area, portions or cooking speed. There is no hands-on performance winner or live-price winner in this comparison.
The documented differences
| Specification | Crispi 4-in-1 Portable Glass FN101ST · US | 6.5-QT Air Fryer Pro XL AF181 · US |
|---|---|---|
| Total capacity (qt) | 4 | 6.5 |
| Layout | single | single |
| Baskets | 1 | 1 |
| Exterior size | Unknown | 12.6 W × 16.3 D × 14.17 H in |
| Rated power (W) | 1500 | 1750 |
| Cleaning | Glass containers, crisper plates and adapter are dishwasher-safe; lids top rack only. Never put the PowerPod in the dishwasher. | Basket and crisper plate are dishwasher-safe; the guide recommends hand-washing the basket to extend its life. |
| Documented modes | Max Crisp, Bake, Air Fry, Recrisp | Max Crisp, Air Fry, Roast, Bake, Reheat, Dehydrate |
| Warranty statement | 1-year limited warranty | 1-year limited warranty |
What could change your choice
Measure the food footprint you need, inspect the manual's clearance instructions and confirm exact-model accessories. Unknown dimensions and coating chemistry are not equivalent to zero or an adverse finding. Current price, stock and personal budget can reverse a specification-based preference.
FN101ST: official source
AF181: official source
FN101ST: model-specific notes and limitations
Includes swappable 4-qt and 6-cup containers; only one cooks at a time. The glassware claim does not establish the material of every cooking component. Ninja’s official FN100-series guide applies: SharkNinja support lists the FN101ST as covered, though the guide text names the FN100. It says to keep objects 6 inches from the vent, without rear, side or top distances.
glass container: Manufacturer describes glassware as PFAS- and PTFE-free. Source
containers: Owner’s guide describes glass containers with a fixed heat-protectant base and handles. Source
lids: Owner’s guide describes BPA-free plastic lids for microwave and storage use only. Source
AF181: model-specific notes and limitations
We read the manufacturer’s length figure as front-to-back depth; the height is Ninja’s published value, not our measurement. The owner’s guide asks for adequate space above and on all sides, without giving distances.
basket: Owner’s guide calls the removable basket both nonstick-coated and ceramic-coated; further coating chemistry is not stated. Source
Sources verified 2026-09-14. Comparison is based on manufacturer statements, not our testing. How we research.