Compare Air Fryer
Ninja Crispi Pro 6-in-1 Glass Air Fryer scores higher on safety - here's why.
The most important dimensions, side by side.
Safety Context
Here's what our analysis flagged on the safety front — not to alarm you, but because this is exactly the kind of detail that's hard to find in a spec sheet.
Bella
Active Prop 65 warning
California requires this disclosure when a product contains substances on its list — it doesn't mean it's unsafe, but it's worth factoring in for families with young children.
Ninja
No active safety flags in our analysis.
Safety flags affect scores — our V4.2 rubric weights safety at 50% of the overall score. If a product has an active Prop 65 warning, that's reflected in its safety pillar rating above. The comparison above shows exactly where the gap lives.
The basket uses a ceramic nonstick coating that's free of PTFE and PFOA per the brand's claim — no independent lab has verified the full chemistry. Ceramic coatings are generally safer than older nonstick materials, but without an ICP-MS test you can't confirm what's in the ceramic binder. Use non-metal utensils and hand wash to extend the coating's life.
The cooking vessel is borosilicate glass — chemically inert at any cooking temperature, no coatings to chip or degrade, and fully transparent so you can see exactly what's happening inside. It won't leach anything into your food, full stop.
The crisper plate is ceramic nonstick, which avoids PTFE and PFOA per the brand — but no independent lab has tested it. Ceramic is a broad category and some formulations use PFAS-based binders that don't appear in marketing copy. Until Bella publishes third-party test results, you're taking their word on the chemistry.
The crisper plate has a ceramic nonstick coating, which doesn't contain PTFE or PFOA per Ninja's claims — but no independent lab has verified it's free of PFAS binders that can appear in sol-gel ceramic formulations. If the coating is your main concern, that's a meaningful gap. Plan for hand-washing and non-metal utensils to extend its life.
No independent lab — not Mamavation, SGS, Intertek, or any other certifier — has publicly tested this air fryer's coatings. Bella doesn't appear on Mamavation's approved or failed lists. If third-party PFAS verification matters to you, this fryer doesn't have it.
ETL Listed means the electrical components passed a safety review — it says nothing about whether the food-contact surfaces are PFAS-free. No independent lab (Mamavation, SGS, Intertek) has tested this fryer's ceramic crisper plate coating. If third-party chemical verification matters to you, it isn't here.
At 325W per quart, this fryer heats fast and holds temperature well throughout the cook. You'll get consistent browning without the soggy-then-crisp lag some lower-wattage units have. The tradeoff is a louder fan, but the performance is real.
At 271.93 W/qt, this fryer handles everyday family cooking well — wings, vegetables, reheating, and frozen foods all come out properly. For dense proteins like thick chicken thighs or pork chops, plan on flipping halfway through to get even browning.
400°F handles most everyday air frying — chicken thighs, fries, reheated pizza — without issue. You won't get the deep surface char you'd want on a thick steak, but that's true of most air fryers at this price. It's the category standard, not a weakness.
450°F covers the full cooking range: air frying, roasting, high-heat crisping, and finishing. You won't hit a ceiling on any standard recipe. At max temp, food can overcook fast — check it early.
At 4 quarts, this fits one to two adults comfortably — think a pound of wings or two chicken breasts in a single batch. A family of three or more cooking a full protein course will need two to three batches. Bella hasn't published interior basket dimensions, so exact usable area is estimated.
At 5.7qt, this fryer fits a single-batch cook for a family of 4 (roughly 1 lb of wings plus vegetables) per Good Housekeeping's testing. Ninja hasn't published interior bowl dimensions, so you can't confirm exact usable area — estimated interior diameter is around 9.5 inches based on exterior geometry.
All food-contact parts are dishwasher-safe, so cleanup is done the moment you load the rack. That matters more than it sounds — air fryers you actually clean stay in rotation; ones that require hand-scrubbing end up in a cabinet. Repeated dishwasher cycles will wear the coating faster over years, but hand washing when you have time helps.
Every food-contact part is dishwasher-safe, so cleanup is load-and-forget. One caveat: repeated dishwasher cycles will wear down the ceramic nonstick coating on the crisper plate faster than hand-washing would.
Bella hasn't published a noise level for this model and no third-party measurement exists. That means you're going in blind on noise — which matters if you cook while kids are sleeping or in an open-plan home. No data is treated as worst-case until a measurement is available.
At 72 dB, this is loud enough that you'll need to raise your voice to hold a conversation in the same room while it's running. Evening use in an apartment or open-plan home will be noticeable to everyone nearby.
Two years of warranty coverage is one year above the US standard and solid for a $60 fryer. You're covered for manufacturing defects through the period when most coating issues or motor problems would surface. At this price point, two years is reasonable.
One year covers manufacturing defects — standard for US air fryers. Accidental glass breakage from thermal shock (pouring cold water on a hot bowl) isn't covered after 90 days. If you pay with an Amex or Visa Signature card, you'll typically get the warranty doubled to two years at no extra cost.
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Everything you need to make the call — who each one is for, and who should skip it.
Go for it if you...
You're cooking for 1-2 people and can live with batching a larger meal occasionally.
You want a dishwasher-safe basket — the entire basket and tray go in, no hand-scrubbing.
You're on a tight budget and prioritize cooking power: 325W per quart is strong for the price.
You already own a range hood or cook near a window — this fryer runs loud and will fill a quiet kitchen.
You cook for 5+ people regularly and the base Crispi's 4qt basket isn't big enough to get dinner on the table in one batch
You want a borosilicate glass cooking vessel — no coatings touching your food, fully transparent so you can watch the cook, and chemically inert even at high heat
You'll actually use multiple cooking modes — air fry, bake, roast, dehydrate, and steam — and want one appliance instead of five
The main thing to know
The ceramic coating carries an active Prop 65 warning for nickel and chromium compounds, and BELLA hasn't submitted it for independent PFAS testing — so material safety rests entirely on brand claims.
The borosilicate glass vessel is genuinely coating-free, but the crisper plate is ceramic nonstick — Ninja claims it's safe, and no independent lab has verified that. You're also paying $120 more than the base Crispi for a larger basket and extra cooking modes, not a safer cooking surface.
Skip this if you...
You want ceramic coating that's been independently tested PFAS-free by a lab like Mamavation or SGS.
The active Prop 65 warning for nickel and chromium compounds is a dealbreaker — it's attached to this specific product, not generic packaging language.
You're feeding a family of 3 or more — 4qt will have you running two or three batches for a full meal.
Noise is a factor in your home — this unit registers significantly louder than most air fryers its size.
You need the crisper plate to be independently lab-verified PFAS-free — it's ceramic nonstick with brand-only safety claims, not third-party tested
Your household is 1-4 people and a 4qt basket is enough — the base Ninja Crispi has the same glass vessel for $120 less
You're price-sensitive — at $299.99, this is one of the most expensive air fryers on the market, and glass-vessel alternatives exist at a fraction of the cost
Neither of these quite what you're looking for?
I've reviewed all Air Fryer options at every price pointEvery Air Fryer in our database is scored using R3's V4.2 deterministic rubric — the same inputs always produce the same score. For this comparison, we evaluated Bella and Ninja across 3 independent criteria: Safety (50%), Efficacy (25%), Usability (25%). No sponsored rankings. No paid placements.
Straight answers — no sponsored content, no filler.
The Bella 4Qt Slim Air Fryer uses a ceramic nonstick basket with a ceramic nonstick crisper plate. Stainless steel and glass are inherently PFAS-free materials, so this model passes our material safety screen.
Between these two, the Ninja Crispi Pro 6-in-1 Glass Air Fryer (borosilicate glass basket, 7.8/10 safety) uses materials I'm more comfortable with at high heat. The Bella 4Qt Slim Air Fryer's ceramic nonstick basket scored 6.4/10. In our V4.2 rubric, basket material accounts for a significant portion of the safety pillar, which carries 50% of the overall score.
For families, capacity comes first: Bella offers 4-qt vs Ninja's 5.7-qt. For cleanup, both are dishwasher-safe. Overall, I'd lean toward Ninja for most families.
304 stainless steel is inherently PFAS-free and won't off-gas at any cooking temperature. Nonstick coatings (PTFE/Teflon) are stable below 400°F but can begin degrading above that threshold. In our V4.2 rubric, stainless and borosilicate glass baskets consistently score higher on the safety pillar. That said, a well-maintained nonstick basket from a reputable brand still meets safety baselines - it's a question of margin, not danger.
We use our V4.2 deterministic rubric with four weighted pillars: Safety (50%), Efficacy (20%), Usability (20%), and Value (10%). For air fryers, safety evaluates basket material composition, Prop 65 compliance, third-party certifications, and PFAS testing. Efficacy covers cooking performance, temperature accuracy, and capacity-to-wattage ratio. Usability scores noise levels, cleanup ease, and warranty terms. Every score is reproducible - the same product data produces the same score.
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