What Exactly Does Caffeine-Free Matcha Taste Like? - Tasting Table
Briefly

Caffeine-free matcha, while lower in caffeine, suffers a loss in flavor during decaffeination, resulting in a milder taste compared to regular matcha.
The decaf matcha's flavor can be compared to a 'second steeping' of the leaves, leading to a lighter taste that many users find satisfactory despite its lack of potency.
Despite being less robust, some drinkers appreciate decaf matcha's smoothness, finding its earthy notes reminiscent of mushrooms, although it's generally considered flatter.
While decaf matcha appeals to those cutting caffeine, it lacks the strong umami and grassy flavors that make regular matcha enjoyable.
Read at Tasting Table
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