Should I separate App Store keywords with commas or spaces?

Use commas with no spaces after them. A space between comma-separated keywords is wasted from your 100-character budget without adding anything the algorithm reads differently.

'fitness,tracker,workout' uses fewer characters than 'fitness, tracker, workout' for the identical set of indexed terms, since the space after each comma counts against your limit but doesn't change how the terms are parsed.

This is a small optimization, but across a full keyword field it can free up enough characters for one more real candidate term.

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