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The Ninja CRISPi PRO 7-in-1 is the best glass air fryer for most UK buyers. It combines two glass containers, seven cooking functions, a maximum temperature of 230°C and a PFAS-free CleanCrisp glass cooking system according to SharkNinja. Its specification makes it the most versatile option in this comparison for family cooking and meal preparation.
Fritaire is the better choice if a rotisserie, tumbler basket and self-cleaning glass bowl matter more than the Ninja’s higher maximum temperature and broader range of functions. The smaller Ninja CRISPi 4-in-1 suits portable cooking, smaller portions and meal preparation.
| Rank | Model | Best for | Key information |
|---|---|---|---|
| 1 | Ninja CRISPi PRO 7-in-1 XL | Best overall | 5.7L and 2.3L glass containers; seven functions; up to 230°C; £249.99 |
| 2 | Ninja CRISPi PRO 7-in-1 | Glass cooking with two size options | £219.99–£244.99 depending on colour and version; PFAS-free CleanCrisp glass |
| 3 | Fritaire Self-Cleaning Glass Bowl | Rotisserie and self-cleaning glass bowl | £179; 1,500W; up to 200°C; six one-touch functions |
| 4 | Ninja CRISPi 4-in-1 | Portable cooking and smaller portions | 1.4L and 3.8L glass containers; four functions; 1,700W |
Prices and included accessories can differ between colours, versions and retailer listings.
The comparison favours models with a complete glass cooking system rather than a conventional air fryer that merely accepts a glass dish. That distinction matters: a Pyrex glass air-fryer dish is an accessory for use inside a compatible appliance, whereas the Ninja CRISPi and Fritaire are complete appliances designed around glass cooking vessels.
Choose the Ninja CRISPi PRO if you want a versatile glass air fryer for family cooking and meal preparation. The XL version, model AS101UKYL, includes a 5.7-litre glass container and a smaller 2.3-litre container. The larger vessel is useful when one portion is not enough, while the smaller one suits modest servings or separate meal-prep portions.
The seven modes are Max Crisp, Air Fry, Bake, Prove, Roast, Dehydrate and Re-crisp. Its maximum temperature is 230°C and its rated power is 2,050 watts. The standard CRISPi PRO range is listed at £219.99–£244.99, while the XL version is listed at £249.99 on SharkNinja UK.
SharkNinja describes the CleanCrisp glass as PFAS-free and dishwasher-safe. It also says the containers resist thermal shock and can be used for storage in a fridge or freezer. This gives the PRO a clear appeal for shoppers who want one glass cooking system that can move between preparation, cooking and storage.
The PRO is therefore the strongest Ninja glass air fryer UK option when capacity and control matter more than portability. Its higher temperature and extra programmes also make it more flexible than the smaller CRISPi 4-in-1, although the larger system is less focused on carrying between locations.
Fritaire is the best alternative for rotisserie cooking and a glass bowl marketed as self-cleaning. Its equipment includes a rotisserie, tumbler basket, air stand and grabber. The bowl is made of glass, with six one-touch functions, 1,500 watts of power and a maximum temperature of 200°C. The official UK price is £179 on the Fritaire product page.
Fritaire describes its bowl as self-cleaning: the user adds water and washing-up liquid, then starts the air circulation. That is a different cleaning approach from the Ninja’s dishwasher-safe CleanCrisp glass. Fritaire also markets the product as BPA-free, PFAS-free and Teflon-free. These are the manufacturer’s own claims, so they should be read as product specifications rather than an independent safety ranking.
The Ninja CRISPi 4-in-1 is the most practical pick for smaller kitchens, portable use or smaller meals. It has Air Fry, Crisp, Reheat and Cook programmes, plus a portable 1,700-watt PowerPod. The stated Meal Prep set includes 1.4-litre and 3.8-litre glass containers. SharkNinja lists CRISPi versions from £125.99 to £159.99, while John Lewis listed one version at £119 at the latest check.
John Lewis describes the 4-in-1 as having removable crisper plates and preset programmes rather than fully manual cooking controls. That difference matters when choosing between CRISPi and CRISPi PRO: the 4-in-1 is simpler and smaller, while the PRO adds more cooking modes, a higher maximum temperature and a larger 5.7-litre vessel. The John Lewis practical review covers the 4-in-1’s construction and preset approach.
Independent testing also separates the two main glass-air-fryer approaches. RTINGS judged Ninja Crispi to perform better than Fritaire as an air fryer, while Fritaire’s advantages included its tumbler basket and rotisserie. Fritaire has also been included in the Guardian’s UK guide to tested air fryers, giving it a place beyond its own product marketing.
A complete glass air fryer is not the same product as a glass insert. Pyrex sells borosilicate-glass dishes intended for use in air fryers, including a model with a removable handle. The dishes are dishwasher-safe and can be used for foods such as gratins, roasted vegetables, chicken and desserts.
Pyrex states that its borosilicate glass is designed to withstand temperatures from −40°C to 350°C and thermal shock up to 240°C, according to its product information. This makes a Pyrex dish useful when you already own an air fryer and want a glass cooking vessel, but it does not turn that appliance into a glass air fryer. Check the air fryer’s usable dimensions and instructions before using any insert.
For shoppers looking for a PFAS-free air fryer, SharkNinja describes the Ninja CRISPi PRO’s CleanCrisp glass as PFAS-free. The glass is the main cooking surface identified in the product information, and SharkNinja also describes it as dishwasher-safe.
That specification should not be broadened into a claim that every part of every glass air fryer is made without coatings. Philips states that some of its air-fryer parts use a PTFE-based non-stick coating, while also describing those products as PFOA-free and food-safe according to its information. The relevant comparison is therefore the material used on the food-contact surfaces of the particular model.
The FDA explains that PFAS may occur in food-contact materials, including non-stick coatings, and that assessment depends on intended use and possible migration into food. For a buyer searching for a non-toxic air fryer UK option, the practical approach is to look for a specific material claim and identify which component it covers. Ninja makes the PFAS-free claim for the CRISPi PRO’s CleanCrisp glass; Fritaire makes PFAS-, BPA- and Teflon-free claims for its product.
Not automatically. The benefit depends on the food-contact surfaces in the complete appliance, not just its appearance. Ninja describes the CRISPi PRO’s CleanCrisp glass as PFAS-free, while other air-fryer designs may use different materials or coatings. Glass is therefore a material specification to compare, not a guarantee that one appliance is healthier in every respect.
The Ninja CRISPi PRO has the clearest relevant specification in this comparison: SharkNinja describes its CleanCrisp glass as PFAS-free. Fritaire also markets its product as PFAS-, BPA- and Teflon-free. These claims identify the stated materials, but neither model should be treated as the result of an independent universal toxicity ranking.
