App Store Optimization (ASO) is the process of improving an app's visibility in the App Store (iOS) and Google Play Store (Android) to increase organic downloads. ASO covers keyword research specific to app store search behavior, metadata optimization (title, subtitle, description), screenshot and preview video strategy to improve install conversion rate, review management, and A/B testing of listing elements. The App Store algorithm ranks apps by keyword relevance in the metadata, listing conversion rate, and review velocity.
SEO optimizes web pages to rank in Google search results. ASO optimizes app listings to rank in App Store and Google Play search results. The ranking factors are different: the App Store algorithm weights keywords in the title and subtitle far more heavily than those in the description, and conversion rate (the percentage of users who install after viewing the listing) directly affects ranking. ASO also includes visual optimization — screenshots and preview videos — which traditional SEO does not.
Initial keyword ranking movement typically appears within 2 to 4 weeks of publishing an optimized listing. Screenshot and preview video changes affect install conversion rate within days of going live. Full category ranking improvement, which depends on cumulative install volume and review velocity, takes 3 to 6 months of sustained ASO effort. Apps launching with an optimized listing from day one consistently outperform apps that optimize retrospectively.
An ASO audit covers keyword coverage gaps (which target terms are missing from the title, subtitle, and description), metadata effectiveness (how well current keywords rank), screenshot conversion performance (how the current listing converts browsers to installers versus competitors), review health (average rating, review velocity, developer response rate), and competitive positioning (where the app ranks relative to competitors on shared keywords).