Instant Pot Duo Plus 8L vs Ninja Foodi 11-in-1 Multi Cooker 6L

What you'll actually notice

Choose the Instant Pot Duo Plus 8L when large-batch pressure cooking is the recurring job, an 8L stainless-steel inner pot is useful, and crisping can stay in another appliance.

Choose the Ninja Foodi OP350ANZ when pressure-cook-then-crisp meals justify a smaller 6L base pot and a two-lid TenderCrisp workflow.

The trade is simple: more base-pot capacity and a focused pressure workflow versus built-in crisping and the extra lid that makes it possible.

This comparison is really focused 8L pressure cooking versus 6L pressure cooking with built-in crisping. Duo Plus gives you more base-pot capacity and stainless steel but leaves air frying to another appliance. OP350 gives up 2L of pressure-pot space and uses a ceramic-coated pot in exchange for TenderCrisp capability.

That means the correct choice depends on whether crisping belongs inside the multicooker at all. If you already own an air fryer you like, OP350's extra lid and modes may duplicate equipment. If pressure-then-crisp meals are the reason you are shopping, Duo Plus cannot solve that job without a separate appliance.

What changes the choice

Pressure-cooking capacity is 8L versus 6L

The Instant Pot uses an 8L inner pot. The OP350 uses a 6L cooking pot plus a 3.7L Cook & Crisp Plate. The crisp plate is a separate accessory, not extra pressure-cooking capacity.

If 6L would repeatedly constrain soups, stocks, curries or meal-prep batches, the Instant Pot has a structural advantage. If 6L already covers your meals, the extra two litres may matter less than the Ninja's crisping system.

TenderCrisp is the Ninja's reason to exist here

The Duo Plus does not include built-in air frying. The OP350 does: pressure cook first, then swap to the separate TenderCrisp lid for Air Fry or another dry-heat finish.

That consolidation is useful when you regularly cook both stages. If you already own an air fryer you prefer, or rarely crisp after pressure cooking, the OP350's defining feature carries much less weight.

The second lid is part of the ownership decision

The OP350 includes both a pressure-cooking lid and a TenderCrisp / Air Fry lid. You need somewhere to store the unused lid and must swap lids to move from pressure to crisping.

That friction may be trivial if TenderCrisp replaces a separate appliance. If you mainly pressure cook, it can become stored complexity instead.

Material and secondary specs should not distract from the architecture

The Instant Pot's inner pot is 304-grade (18/8) stainless steel and is not stovetop-safe. The OP350 uses a ceramic-coated cooking pot. Treat that as a material preference, not proof that one cooks better.

Instant Pot is recorded at 1200W with 13 smart programs; OP350 at 1460W with 11 functions. Neither the program count nor wattage establishes comparative cooking speed or quality.

The OP350 is 38.5cm W × 35cm D × 35cm H and 9.56kg. The current Instant Pot information we checked does not resolve dimensions, so no overall compactness winner is claimed.

What this means: the 8L-versus-6L capacity gap and the presence of built-in crisping are both structural. Stainless versus ceramic coating adds a third hard preference for some shoppers.

Switch when: choose Duo Plus when larger pressure batches, stainless steel and a simpler one-lid pressure workflow matter more. Choose OP350 when 6L is enough and pressure-to-crisp cooking is recurring enough to justify the second lid.

The practical choice

Start by deciding whether air frying belongs in this appliance. If the answer is no, Duo Plus stays simpler and gives you more pressure-cooking headroom. If the answer is yes, OP350 earns its complexity because it removes the need to transfer food to a separate fryer.

Then check batch size. A family or meal-prep routine that genuinely fills an 8L pot makes Duo Plus's capacity meaningful. If your regular meals fit comfortably in 6L, that advantage becomes mostly unused volume.

Finally, treat pot material as a real preference rather than a footnote. Stainless-steel buyers have a clear reason to favour Duo Plus; shoppers who prefer a coated serving-friendly pot may lean the other way.

When to choose Instant Pot Duo Plus 8L

Choose it when 8L base-pot capacity will be used regularly, stainless steel matters, batch pressure cooking outranks crisping, and a separate air fryer is acceptable or already owned.

When to choose Ninja Foodi OP350ANZ

Choose it when pressure-cook-then-crisp meals are normal, 6L is sufficient, built-in Air Fry solves a recurring job, and storing and swapping two lids is acceptable.

Choose neither when

Choose the Ninja Foodi SmartLid OL650 when pressure + crisp appeals but you specifically want one lid. Choose the Breville Fast Slow GO when a 6L stainless-steel pressure-focused workflow is more important than crisping.

PIQSY conclusion

Instant Pot is the stronger large-batch pressure tool; OP350 is the stronger integrated pressure-and-crisp tool when its two-lid workflow is acceptable. Current price, ratings and popularity should come after that architecture decision, not before it.