Subtitle (Apple)

The subtitle is one of the highest-leverage fields in App Store metadata. It's 30 characters, fully indexable for search, and visible above the fold on the App Store listing. Adding a high-volume keyword to your subtitle typically produces a measurable rank gain for that keyword within 24-72 hours. Common patterns: a clear value proposition ("Track your runs and pace"), a keyword-rich descriptor ("Recipe maker & meal planner"), or a benefit ("Sleep better tonight"). The subtitle is the single most-tested field in ASO experiments; A/B testing here usually moves install conversion by 5-15%.