Ninja Speedi ON500UK Review: the compact 12-in-1 cooker for fast weeknight meals

The Ninja Speedi 12-in-1 ON500UK sits in that growing category of appliances that promise to replace several bits of kit at once: hob, air fryer, steamer, slow cooker, and even your oven for small batches. On paper, it targets small households with its 5.7L capacity and a clear promise: a full meal for up to four people in one go, and in less time than using separate pans. The headline feature is Ninja’s Rapid Cooking System, which combines steam and hot air to cook starches and proteins together while crisping the top.

Among the published reviews, the general tone is very positive. The product sits around 4.7/5 over roughly a hundred ratings, which is strong in this category. People who moved from other Ninja models often say it’s simpler and more reliable than pressure cookers they struggled with. Several verified buyers highlight one-pot dinners and quick rice-based meals as the main benefit, more than exotic functions like proving dough or dehydrating.

In my opinion, this cooker is clearly designed for convenience rather than hardcore culinary experimentation. The spec sheet lists 12 modes (Speedi Meals, Steam Air Fry, Steam Bake, Steam, Grill, Air Fry, Bake/Roast, Dehydrate, Sear/Sauté, Slow Cook, Prove, Reheat), but the real hook is the ability to stack ingredients with the Cook & Crisp tray and walk away while it finishes everything. For parents or people working late, that matters more than fine-grain temperature control.

It is not flawless. A few comments mention drying food if you’re not careful with temperatures and time, and one buyer points out that it costs more to run than cooking with gas. There’s no smart-home integration either, so it’s a purely manual appliance. But if you care most about speed, straightforward controls and cutting down on washing up, this model looks like one of the more coherent offers in the mid-size multi-cooker range.

The exact selling price isn’t stated here, but the product sits high in the Home & Kitchen rankings (around #4 in Electric Multi-Cookers and within the top 10,000 overall), and holds a 4.7/5 rating over more than a hundred reviews. That combination usually indicates that, for most buyers, the value proposition feels fair. Users repeatedly comment that it’s great for small kitchens and that it has effectively replaced multiple appliances for them, which is important when you’re assessing value beyond just the sticker price.

On the plus side, you’re getting 12 cooking functions, a 5.7L capacity, dishwasher-safe parts, and a 2-year guarantee from a well-known brand. Several people say it’s easier to use and more versatile than previous Ninja models they owned, particularly pressure cooker-based ones. If this cooker lets you ditch a separate air fryer, slow cooker and maybe even reduce oven use for small meals, then it can free up both space and budget in the long run. The fact that one user is considering buying a second unit hints that, for them, the cost-to-benefit ratio is strong.

On the downside, one review notes that it’s more expensive to run than a gas oven. That doesn’t make the product bad value by itself, but it’s a reminder that “value” isn’t only about purchase price; it includes energy costs. If your home relies heavily on cheap gas for cooking, the running cost difference might matter to you. Also, if you rarely cook for more than one person or mostly use a microwave and a pan, a 12-in-1 multi-cooker might be overkill, and you’d never exploit the range of modes you paid for.

In my opinion, the Ninja Speedi ON500UK offers good value for people who will genuinely lean on its strengths: fast, one-pot meals, regular air frying, and replacing several separate gadgets. If you just want a basic air fryer or a cheap slow cooker, there are more affordable single-purpose options. But if you’re short on space, cook often for two to four people, and like the idea of stacking ingredients and walking away, the blend of functions, build quality and user satisfaction makes the price easier to justify.

The Speedi ON500UK is clearly designed with limited countertop space in mind. The dimensions given are roughly 35 cm deep, 33 cm wide and 31 cm high, with a weight around 7.3–7.4 kg. That’s not tiny, but for a 5.7L multi-cooker it’s on the compact side. Several buyers with small kitchens explicitly say it fits their space where a full-sized oven or multiple appliances would be awkward. One person even mentions planning to buy a second unit, which says a lot about how it fits into their cooking setup.

The exterior is finished in grey with stainless steel elements. It’s fairly neutral, so it should blend into most kitchens without drawing too much attention. Controls are touch-based, with labelled buttons for modes and a digital display for time and temperature. There’s no rotary dial or physical toggles according to the spec, which some people like for cleaning but can be less tactile. Reviews generally describe it as easy to use, with one parent emphasising that they can set it up quickly and then focus on their child while it runs, which suggests the interface is not overly complex.

Because there’s no smart-home compatibility, everything is done directly on the front panel. For some, that’s a downside; for others, it avoids app clutter and connection issues. In my opinion, at this price and in this category, the lack of Wi‑Fi or Bluetooth isn’t a major flaw. Multi-cookers are often used in fairly simple ways: set time, set temperature, hit start. The important part is that the display is readable and the modes are clearly separated, which seems to be the case from buyer feedback.

One thing to keep in mind is the lid mechanism and the need for overhead clearance; multi-cookers usually require some space above to open fully. The exact clearance isn’t stated, but given the 31 cm height, you’ll probably want it under a standard cabinet with a bit of space to tilt the lid. Overall, the design looks functional and space-efficient rather than stylish for its own sake, which aligns with the product’s practical, everyday positioning.

The Speedi ON500UK uses a stainless steel body with a removable 5.7L cooking pot and Cook & Crisp tray. Both the spec sheet and multiple reviews highlight that parts are dishwasher safe, which is a big plus for day-to-day usability and, indirectly, durability: the less painful it is to clean, the more likely people are to look after it properly. One enthusiastic owner even calls it their best purchase for ease of use and cleaning, which suggests the non-stick and removable parts behave well under regular washing.

At roughly 7.3 kg, it’s not a featherweight gadget. That kind of mass usually indicates a decent amount of metal and heating hardware rather than flimsy plastic. Ninja also offers a 2-year guarantee in the UK and Middle East if you register the product, which is a reassuring sign that the manufacturer expects it to hold up beyond the first year. In a crowded multi-cooker market, a solid warranty is an important part of the durability story.

There are currently no widely repeated complaints in the reviews about peeling coatings, broken hinges, or major failures, at least in the sample available. That doesn’t mean issues never happen, but there’s no clear pattern of a specific weak point. The only performance-related criticism that could tie into longevity is the comment on the sauté function being slow and oil running to the edges, which points more to design compromise than structural fragility. For long-term non-stick health, users will still need to avoid metal utensils and harsh scouring, as with any coated pot.

In my opinion, for this class of appliance, the Speedi sits in a good place: stainless steel outer shell, dishwasher-safe internals, and a two-year guarantee make it look like a reasonably safe bet. It’s not a tank built for a restaurant kitchen, but for a small household using it several times a week, there’s nothing in the public feedback that screams early failure risk. As always, how you treat the non-stick pot and how often you slam or mis-handle the lid will matter a lot more than any spec line.

Performance here is mainly about speed and versatility rather than raw power figures, since wattage isn’t explicitly highlighted. From the reviews, the Speedi earns its name: one owner talks about putting together a full meal in about 10 minutes while still being able to focus on their child, which implies fast preheating and efficient cooking. The Rapid Cooking System (steam + convection) is designed to cut total time by cooking different components simultaneously instead of in sequence.

Mode variety is another performance angle. With 12 programs, it covers a lot of ground: you can dehydrate, slow cook, prove dough and reheat leftovers in addition to the main steam/air-fry combinations. In practice, buyers seem to focus on a narrower subset: Speedi Meals, Steam Air Fry, Air Fry, Bake/Roast and Slow Cook. That’s not surprising; people often stick to what reliably saves time. The fact that one user is considering buying a second unit suggests that, for them, the performance and convenience are strong enough to justify doubling down.

Energy use is a more nuanced point. One buyer explicitly says it’s “way more expensive to run than a gas oven.” That’s an important comment: electric countertop appliances can be cheaper than large electric ovens for small portions, but when you compare them to gas, the cost equation depends heavily on local energy prices. If your gas is cheap and electricity is pricey, then even a quick, efficient electric cooker can end up costing more per meal. On the other hand, because the Speedi often cooks faster and in a smaller space than a full oven, some users in other regions might find it economical; it just won’t beat cheap mains gas in every situation.

In my opinion, performance here is strong on time-saving and flexibility but more average on tasks that demand precise browning or gas-like searing. The comments about over-drying and slower sauté show the limits of an all-in-one device. If you accept those trade-offs and mainly want to slash cooking time for simple meals, the Speedi performs well. If you’re chasing perfect grilled toast, ultra-juicy air-fried food with zero tuning, or rock-bottom running costs versus gas, it’s less convincing.

On paper, the Ninja Speedi ON500UK is a 5.7-litre electric multi-cooker aimed at cooking for up to four people. The brand explicitly talks about capacity in real food terms: up to 4 chicken breasts, 200g rice or 225g pasta plus 500g potatoes in one go. That gives a clear idea of scale: it’s for couples or small families, not for big batch cooking for the week. The included accessories are limited but targeted: a 5.7L non-stick cooking pot, a Cook & Crisp tray for layering and crisping, and a small recipe guide with chef-created ideas.

The core promise is the Rapid Cooking System, which blends steam with convection heat. In everyday terms, that should let you cook your carbs and veg in a moist environment while the top layer (usually protein or potatoes) gets hot circulating air for browning. The dedicated “Speedi Meals” program automates this: you choose settings, stack the ingredients, and it handles the timings. Several reviews say full meals in around 10 minutes are realistic once you know what you’re doing, especially for rice plus meat/veg combinations.

Function-wise, the 12 modes cover most typical needs: Speedi Meals, Steam Air Fry, Steam Bake, Steam, Grill, Air Fry, Bake/Roast, Dehydrate, Sear/Sauté, Slow Cook, Prove, and Reheat. There is no pressure cooking on this model, which some buyers actually see as a plus compared with Ninja’s Foodi pressure cookers that they found finicky. One reviewer explicitly says they had repeated pressure build issues on older Ninja units and consider this Speedi a relief: easier to use, more versatile for them, and especially reliable for rice.

Overall, the feature set is broad but not gimmicky: it covers daily cooking tasks more than niche ones. In my opinion, if you want a single device mainly for pressure cooking large joints or whole chickens, this isn’t the right product. But if you mostly want to replace a hob plus an air fryer and simplify one-pan dinners, the spec sheet is coherent, especially given its relatively compact footprint for a 5.7L cooker.

The most consistent feedback is that the Speedi ON500UK delivers on quick, complete meals. Several reviews talk about being able to prepare a full dinner in minutes: rice, meat, and vegetables cooked together using the Speedi Meals or Steam Air Fry modes. One buyer specifically highlights that rice comes out right every time for them, which is something many multi-cookers struggle with. Another mentions putting meat and sauce in the bottom and crisping roast potatoes on the tray at the same time, which is exactly the kind of layered cooking this machine is designed for.

On the flip side, effectiveness depends heavily on choosing the right settings and temperatures. One 4-star review notes that the air fry function can over-dry food if you just use default or high temperatures. They say they’ve had to dial temps down to avoid this, and that the grill mode produces dry toast rather than a well-balanced crisp. This suggests that while the heating power is there, the presets may be a bit aggressive for delicate items, and users need to adjust manually to get the texture they want.

The Sear/Sauté mode gets mixed feedback. A reviewer says it’s a bit slow and that oil tends to run to the edges, which makes sense given the pot shape and the fact that you’re heating a relatively wide base. That means if you’re expecting gas-hob-like responsiveness or wok-style stir-fry performance, you’ll probably be underwhelmed. Another comment directly says it’s “not a patch on a gas cooker,” and that’s a fair expectation check: this is an electric multi-cooker, not a replacement for a powerful gas hob when it comes to fast sautéing.

As a slow cooker and general oven replacement for small quantities, the spec sheet suggests it should handle stews, bakes and roasts comfortably, and the mostly positive Amazon ratings back that up for everyday dishes. In my opinion, where this appliance is most effective is in one-pot, layered weeknight meals and straightforward air frying. For more nuanced grilling or perfect toast, a dedicated grill or toaster will still do a better job. But for people who prioritise speed and simplicity, the overall cooking effectiveness looks solid, with the caveat that you may need to learn which temperatures work best to avoid dryness.