The difference that explains all the others: you consume the leaf
Coffee is an extraction. Ground beans meet water, soluble compounds move into the water, and the grounds are discarded — a large majority of the material you bought goes in the bin. Matcha is not extracted. The whole leaf, milled to powder, is suspended in water and swallowed. Nothing is discarded and nothing is left behind, which is why matcha uses so much less material per cup than coffee and why its price per gram compares very differently to its price per serving. Everything else follows from this. It is why matcha settles if it stands, why particle size decides texture, why a bad matcha cannot be brewed around, and why storage matters so much more — a powder has vastly more surface exposed to air than a bean or a leaf does.
Caffeine: a fact about the leaf, and why the comparison is slippery
TeaHQ's own reading of well-attested general knowledge, with no single source behind it.
Camellia sinensis contains caffeine, and matcha carries more per gram of dry material than most other teas — shading raises it, and the youngest leaf carries the most. Because the leaf is consumed whole rather than infused, all of what is in the powder goes into the cup rather than only the fraction that dissolves in the time you steep. That makes matcha caffeine-dense as a material. Whether a cup of matcha carries more or less than a cup of coffee is a different question and it is dominated by the serving, not by the ingredient: a usucha made with two grams of powder and an espresso made with eighteen grams of coffee are not comparable by category, and the same is true of a 60 ml koicha against a 350 ml filter brew. So the honest statement is compositional and stops there. Matcha is a caffeine-dense material. The amount in any particular cup depends on how much powder went into it, and the range across normal preparations overlaps coffee's range substantially at both ends. What caffeine does to a person is a separate question and TeaHQ does not publish an assessment of it.
What the two ask of you practically
EQUIPMENT. Coffee's entry cost is higher and its ceiling is much higher — grinder, brewer, scales, and a machine if you want espresso. Matcha needs a bowl, a bamboo whisk and a sieve, and the sieve is the piece people skip and should not. SKILL. Coffee has more variables to get wrong: grind, dose, ratio, temperature, time, agitation. Matcha has fewer — sift, ratio, water temperature around 70 to 80°C, and whisk technique — and much less room to recover from a poor ingredient, because you cannot re-brew your way past bad powder. CONSISTENCY. A coffee routine tolerates a stale bag far better than a matcha routine tolerates a stale tin. COST PER CUP. Genuinely comparable at the middle of both markets, and matcha rises much more steeply at the top.
If you are switching, the two mistakes
Buying too much. A large tin at a good unit price will be dull before it is finished. Matcha is bought in the quantity you will drink in a month, which is the opposite of how most people buy coffee beans. Using boiling water. Coffee habits bring a fully boiled kettle, and matcha whisked with boiling water is harsh and bitter. Off the boil, rested a couple of minutes, is the whole adjustment.