An early adopter refers to someone who makes use of something new very quickly.
"I am an early adopter; I couldn’t wait for a day after the new iPhone was released before heading out to the store."
Early Adapter, although commonly used as a mistake while meaning to say early adopter, it could also mean someone who’s been able to rework something for their own custom usage.
"John is an early adapter, he’s made my software his with just a few tweaks."
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