Boswell
Boswell's one product exists specifically to avoid the coated-basket problem: food sits in an uncoated borosilicate glass bowl on a bare stainless crisping rack, so nothing you eat touches a nonstick surface. As with every countertop glass air fryer, the heating unit and base housing are still plastic and metal, but they stay out of the food path. It is a materials-first design from a small brand rather than an established manufacturer.
How clear are their specs?
Marketing leans on "non-toxic" and "no coating" language and confirms a glass bowl and stainless rack, but does not publish a full component-by-component material breakdown or the exact glass grade on every listing.
Products to avoid
Documented so you know what to skip — each still has a full breakdown and sources.