Ninja against Ooni is a temperature decision, not a brand one

One number, published two ways

Both brands publish a peak temperature on Amazon rather than leaving you to guess, which is not universal in this category. Ninja states 700 °F for the Woodfire and 700 °F for the Artisan. Ooni states 500 °C for the Karu 12 — that is 932 °F — and 950 °F for the Koda 16.

Where those numbers sit on the listing is not identical, and the table below labels it. The Artisan’s 700 °F is in a structured “Temperature Range” field. The Woodfire’s is not: it appears in the product title, in the feature bullets and in the long item-type string Amazon uses for search — all marketing copy, from the same manufacturer that filled the field in properly on its other oven. A title is part of the listing, but it is weaker evidence than a spec, and a page ought to be able to say which it is looking at.

Ooni has its own version of the split, in reverse. The Karu 12’s temperature field says 500 °C while Ooni’s own title says 950 °F, and 500 °C converts to 932. We have not resolved which figure Ooni means, so both are on this page. None of that ambiguity is big enough to matter here: whether the Karu is 932 or 950, it is at least 232 °F above anything Ninja sells, and no rounding closes that.

What 700 °F can and cannot do

A Neapolitan bake is defined by finishing before the dough dries out. The stone sets the base and the roof chars the rim inside about ninety seconds, which is why the crumb stays soft and the rim blisters. Ooni sells exactly that: the Karu 12 listing claims a 12-inch pizza in 60 seconds, and 15 minutes to reach temperature.

Ninja sells three minutes. The Artisan claims a 12-inch pizza in 3 minutes at 700 °F, with an 18-minute preheat excluded by its own asterisk; the Woodfire claims the same three minutes behind a 25-minute preheat. Three minutes is not a failed ninety seconds. It is a different pizza. Stretch the same dough across twice the bake and water has time to leave it, and what comes out is firmer, drier and crisper underneath — a New-York-style base that carries toppings, which millions of people prefer. Ninja ships a setting labelled Neapolitan and a setting labelled New York, and the machine is honestly built for the second one.

The ceiling is not carelessness either. Both Ninja ovens draw 1,760 watts, and a US 120-volt household outlet has roughly that much to give and no more. Every plug-in oven in this category is negotiating with the same circuit. You do not buy your way past it inside a plug-in box; you buy your way past it by going outside and burning something, which is precisely the trade Ooni’s flame ovens make. Ooni’s own electric, the Volt 2, reaches 850 °F — above both Ninjas, below every Ooni that burns fuel — and it is the most expensive oven in this comparison.

The closest like-for-like: Artisan against Karu 12

Strip both ranges down to one machine each and the comparison sharpens. The Ninja Artisan and the Ooni Karu 12 are the nearest like-for-like pair the two brands sell: both bake a 12-inch pizza, both carry a 4.6-star Amazon average, and between them they hold the review counts most buyers will actually be reading. Every figure in the next table was read from those two listings on 29 August 2026.

Two rows are worth stopping on before you scroll past them.

Fuel in the box. Ninja’s Power Source field says Corded Electric and its wattage field says 1760 watts, and that is the end of the shopping list. Ooni’s says Gas-Powered, while its feature copy says the oven fires on wood or charcoal straight out of the box with the gas burner sold separately. That last clause is the one buyers miss: the multi-fuel oven does not arrive multi-fuel. If push-button gas is what you want from a Karu, it is a second purchase — and the Koda is the Ooni that arrives that way, which is a decision in its own right and gets its own page at Karu vs Koda.

The Karu’s Included Components field reads “Rawlings Bat”. That is a baseball bat, on a pizza oven listing. It is obviously wrong, we have no way to know what it was supposed to say, and it is reported here rather than quietly swapped for the accessory list in the feature bullets. Where a listing is broken, the table says so — that is the same rule that put “from the product title, not a spec field” under the Woodfire’s temperature above.

What buyers report, side by side

Amazon extracts eight topics from each corpus, and the two shapes differ in a way that maps straight onto the temperature.

The Artisan has 316 topic mentions across 499 ratings, and not one of its eight topics leans negative. The closest thing to a complaint is ease of cleaning, tied at 6 positive and 6 negative across 12 mentions, which is the smallest topic in the set. Value for money runs 39 positive to 3 negative.

The Karu 12 has 265 mentions across 644 ratings. Its top is just as strong — performance at 84 to 7, flavour at 24 with no negatives at all — but two topics carry real dissent and both of them are the fire. Heating speed is 31 to 10. Value for money is 26 to 9, against the Artisan’s 39 to 3. And there is a topic on the Karu with no counterpart on either Ninja listing: burning options, 6 positive to 6 negative. That is 932 °F turning up in the review data. A temperature that cooks a pizza in sixty seconds ruins one in about sixty seconds, and a wood fire has no thermostat.

Electric does not mean indoor

This is the thing most people get backwards, and it is the one mistake on this page that could actually hurt someone.

Neither Ninja goes indoors. The Woodfire burns wood pellets, so that one is obvious. The Artisan is a corded electric oven with no flame in it at all — and Amazon still files it under Outdoor Ovens, where it sits at #2, while Ninja’s own feature copy sells it as weather-resistant and safe to store outside. Electric is not a synonym for indoor-safe. Treating it as one is how a carbon-monoxide problem starts with a pellet oven, and a ventilation and clearance problem starts with the rest.

The counterintuitive part is that the brand with the indoor answer is Ooni, not Ninja. The Volt 2 is the only oven in this comparison whose listing claims indoor use, at 850 °F. It also carries the weakest Amazon average in this set — 3.8 stars across 60 ratings — which is a small corpus on a new listing and is worth watching rather than trusting either way. If the oven genuinely has to live inside, the shelf you want is the indoor pizza oven guide, and the wider plug-in category including the countertop machines is the electric pizza oven guide. Neither is this page.

One inconsistency inside Ninja’s own range

Worth reporting rather than smoothing over, because it looks like an error and is not. The Woodfire has more reviews than the Artisan — 845 against 499 — and a wider sales badge, 300+ bought in the past month against 200+. And it ranks below the Artisan on both of Amazon’s rank measures: #4 in Outdoor Ovens against #2, and roughly #17,900 in Patio, Lawn & Garden against #11,147. Those were read within a minute of each other; category ranks move hourly, so treat the digits as a snapshot and the ordering as the finding.

The two signals do not have to agree. A review count accumulates over years, and the Woodfire is the older machine. A best-seller rank is much closer to now. Read together they say the broader eight-in-one oven has sold more copies in total while the pizza-only one is selling harder today. Neither is a verdict on the pizza, and we have not established which reading is right — only that the two point opposite ways, which is worth knowing before you read either number as proof. The long version of the multi-function case is in the Ninja Woodfire review.

Answer one question and this is decided

Do you need a ninety-second Neapolitan bake? Then it is Ooni, and there is no Ninja that gets there — not at a higher price, not on a different setting, not with a longer preheat. The Karu 12 is the cheapest way in and the best-selling oven in this whole set at 900+ bought in a month, and it also wants fuel you buy again, a match, and somewhere outdoors to stand. The Karu 12 review and the Koda 16 review cover the two obvious versions of that answer, and the main buying guide covers the brands neither of these two competes with.

Do you need it to run off a wall socket? Then it is Ninja, and the Artisan is the pizza-focused one: 700 °F, a three-minute bake, a 90 °F proofing setting that no fuel-burning oven can offer, and a value verdict from its own buyers that nothing else here matches. If pizza is one job among several — smoking, roasting, a 12-pound bird — the Woodfire is the wider machine and gives up seven minutes of preheat to be it.

What this page will not do is name a winner, because the two answers are not on the same scale. One brand sells the temperature the style requires. The other sells not owning a propane tank. Someone replacing four appliances with one box, on a normal outlet, with a balcony and no gas fitting, is making a perfectly rational trade — they are simply not buying a Neapolitan oven, and the marketing on the front of the box will not be the thing that tells them so.