Ninja DoubleStack 10-Qt Air Fryer in Stone Gold review

The Ninja DoubleStack SL401SD is the Stone Gold version of a two-basket, 10-quart air fryer for cooks who want separate settings without the width of side-by-side drawers. Two 5-quart baskets stack vertically, and each gets a removable meal rack for a second food level. That adds loading options, not four independent programs. Unlike the SL451, the exact Stone Gold package lists no built-in thermometer. Choose by your meal layout, counter height and need for a probe.

Ten quarts, but not one ten-quart drawer

SharkNinja lists two 5-quart baskets, two nonstick crisper plates and two meal racks. The total is split between drawers; check each basket opening and rack clearance if you often cook a broad item. The rack adds an upper loading level, but that food shares the drawer's function, time and temperature. Only the top and bottom baskets are separate zones.

The maker's four-food description refers to two food positions in each basket. It suits items that can share a cooking program and fit without blocking airflow. Put foods needing substantially different settings in separate drawers. Stacking is a way to plan a meal, not a promise that every recipe scales cleanly.

Choose Smart Finish or Match Cook for the job

Set separate Zone 1 and Zone 2 programs and Smart Finish coordinates them to complete together, useful for a slower main and a quicker side. Match Cook instead copies one zone's settings to the other for a split batch or similar foods. Neither feature controls the two rack levels independently. If you need four different times or temperatures, the “four foods” description does not satisfy that plan.

The SL401SD package lists no integrated thermometer. Use a separate suitable instant-read thermometer when an internal reading matters. The DoubleStack SL451 adds a probe that stops at a selected doneness, but its guide limits the probe to Zone 2 and excludes frozen protein and thin cuts; it is not a more flexible probe solution.

Six modes without a test claim

The exact page names Air Fry, Air Broil, Roast, Bake, Reheat and Dehydrate. The SL401 guide says Air Broil is fixed at 450°F and no preheat is required. It provides mode-specific defaults but not one complete temperature range for every setting. A 450°F broil preset does not establish a low setting for specialized tasks. The guide advises checking food's progress; this review is not based on independent cooking measurements.

Measure counter height before choosing the vertical layout. The exact Stone Gold page does not list outside dimensions or weight in the inspected specifications. Leave the manual's air clearance, and make room to pull out hot drawers onto a heat-resistant surface. A low cabinet or frequent wide foods may favor a lower-profile dual basket or a single wide drawer.

Cleanup and material limits

The guide identifies the baskets, crisper plates and racks as dishwasher-safe parts, while recommending hand-washing to extend their life. The powered body should not go in the dishwasher or be immersed. A meal that uses both racks creates more pieces to soak, rinse and dry than a basic single basket; decide whether the extra loading flexibility is worth that routine. The product calls its baskets and plates nonstick, but the reviewed material does not identify their substrate or coating chemistry and does not make an explicit PFAS-free statement for this exact configuration. If that disclosure is a requirement rather than a preference, this unknown is a reason to compare another model instead of assuming the finish answers it.

Where the SL401SD sits in the DoubleStack family

The SL401SD adds two quarts over the 8-quart SL201, but not the SL451's probe. Its Stone Gold finish and 10-quart no-probe package may suit someone who wants added basket capacity without a zone-specific probe. A side-by-side dual basket takes more width; a wide single drawer offers one open area but not two separately timed drawers.

The Ninja-authored SL401 guide states 120 V~ 60 Hz and 1,690 W for SL401; it is a platform guide, while SharkNinja's product page identifies the Stone Gold code as SL401SD. The guide is not labeled with the SD suffix. The maker lists a one-year limited warranty. Search by the full phrase “Ninja DoubleStack SL401SD Stone Gold” to distinguish this finish/package from the probe-equipped SL451. This configuration is strongest when two 5-quart drawers and rack-level cooking fit your routine, and the height, extra cleanup and lack of an integrated probe are acceptable.

Sources: SharkNinja's SL401SD U.S. product page; Ninja-authored SL401 Owner's Guide (document code SL401_IB_MP_Mv9, model SL401); and the exact SharkNinja SL401SD media listing.