Cold Brew vs. Iced Coffee: What's the Difference?

Both are cold. Both have caffeine. But cold brew and iced coffee are fundamentally different drinks — different brewing methods, different flavor profiles, and different use cases.

How They're Made

Iced Coffee

Iced coffee is simply hot-brewed coffee poured over ice. You can make it with any brewing method — drip, pour-over, French press, or even espresso. The key is brewing it stronger than usual (using a 1:12 ratio instead of 1:16) because the melting ice will dilute it.

Japanese iced coffee is the gold standard: brew your pour-over directly onto ice. This flash-cooling preserves the bright, complex flavors that are lost when hot coffee sits and cools slowly.

Cold Brew

Cold brew uses cold or room-temperature water and steep time instead of heat to extract flavor. Coarse-ground coffee sits in cold water for 12-24 hours, then is filtered. The result is a concentrate that's typically diluted 1:1 with water or milk.

Flavor Comparison

	Iced Coffee	Cold Brew
Acidity	Higher — bright, crisp	Lower — smooth, mellow
Body	Light to medium	Medium to heavy
Sweetness	Moderate	Naturally sweeter
Complexity	More nuanced — origin flavors shine	Simpler — chocolate, caramel, nutty
Bitterness	Can be bitter if over-extracted	Very low bitterness

In simple terms: Iced coffee tastes like coffee that happens to be cold. Cold brew tastes like a different drink entirely — sweeter, smoother, and heavier.

Caffeine Content

Cold brew concentrate has significantly more caffeine per volume than iced coffee — roughly 200mg per cup versus 120mg. However, since concentrate is diluted before drinking, the final caffeine content is similar. If you drink cold brew concentrate straight (some people do), expect a serious caffeine hit.

Making Cold Brew at Home

It's absurdly easy:

1. Grind 100g of coffee coarsely (like raw sugar)
2. Combine with 600ml of cold filtered water in a jar
3. Stir gently, cover, and refrigerate for 16-20 hours
4. Strain through a fine mesh sieve lined with a paper filter or cloth
5. Store the concentrate in the fridge for up to 2 weeks
6. Dilute 1:1 with water, milk, or your preferred liquid

Tips:

• Use a medium or dark roast — light roasts can taste flat and sour in cold brew
• Don't steep longer than 24 hours — it gets woody and astringent
• The concentrate is versatile: add milk for a latte, tonic water for a coffee tonic, or pour over ice cream for an affogato

When to Choose Which

• Want bright, complex flavors and origin character? → Iced coffee (Japanese method)
• Want smooth, sweet, low-acid refreshment? → Cold brew
• In a hurry? → Iced coffee (brew in minutes)
• Meal prepping? → Cold brew (make a batch, drink all week)
• Hot and humid day, just need cold caffeine fast? → Cold brew from the fridge, no contest

Both are great. The best one is the one you enjoy drinking.