Should I include both plural and singular versions of the same keyword?

Usually no — Apple's search matches singular and plural forms of common English words to each other, so including both in a 100-character field just wastes characters you could spend on a different term.

This stemming behavior is well-documented ASO practice: a keyword field containing 'tracker' is generally matched against searches for 'trackers' too, without needing the plural spelled out separately.

The exception is when the singular and plural forms carry meaningfully different intent, not just grammatical number — that's rarer than it sounds, but worth a quick popularity check on both forms if you're unsure rather than assuming.

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