Which occurrence is kept?

The first one. Later repeats are removed, so the original word order is preserved.

Can it ignore capitalisation?

Turn on "Ignore case" and Apple, apple and APPLE count as the same word.

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Delete repeated words from a sentence or paragraph, keeping the first occurrence. Optionally ignore case. Free, no signup.

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Ignore caseIgnore case

UNIQUE WORDS

Which occurrence is kept?: The first one. Later repeats are removed, so the original word order is preserved.
Can it ignore capitalisation?: Turn on "Ignore case" and Apple, apple and APPLE count as the same word.