Blender vs. Food Processor vs. Immersion Blender: What's the Difference?

A blender's defining feature is its container: a narrow base and tall sides create a vortex that pulls ingredients down toward the spinning blade. That's why a blender needs liquid; without enough, ingredients stick to the sides and the blade spins freely. Smoothies, puréed soups, pourable sauces, and drinks are its strengths. Crushing ice and grinding nuts require models with powerful motors. When blending hot soup, never close the lid completely; steam pressure can build up inside and force the lid off. Don't overfill the container either: the liquid should come no higher than two-thirds of the container, measured from just above the blade.

A food processor works with a wide, shallow bowl; the blade spins at the bottom and cuts ingredients, sending them toward the sides. It doesn't need liquid, so it's the tool for dry tasks: chopping onions, grinding meat, grating cheese, making hummus and spreads, and bringing cookie or tart dough together. Most models also include slicing and grating disks. By contrast, soup puréed in a food processor won't be smooth, and the bowl can leak around the lid, so it can hold only a limited amount of liquid. When chopping onions in a food processor, pulse in short bursts rather than running it continuously; otherwise, the onion gets mashed instead of chopped and releases its juice.

An immersion blender is a long shaft with a blade at the end; instead of moving the ingredients to a bowl, you place the blender directly into the container. That's its biggest advantage: lentil soup can be puréed right in the pot on the stove, with no transfer, fewer dishes, and no need to carry boiling liquid from one place to another. Its limitation is power; it can't blend fibrous vegetables or raw nuts as finely as a countertop blender. It works best in a deep, narrow container; in a wide, shallow one, it can splash and the blade may spin freely without reaching the ingredients.

If you're buying just one appliance, choose based on how you cook. In a kitchen where soups and liquid dishes are common, an immersion blender is often the most useful and takes up the least space. If you frequently chop, make dough, or prepare spreads, you need a food processor. A countertop blender can't replace either one, but it makes smoother mixtures than both. Most immersion blender sets come with a small chopper bowl and a whisk; for light tasks, the set can stand in for all three appliances and fit in a single drawer.