App Store Ranking Factorsとは？

Neither Apple nor Google publicly disclose the exact ranking algorithms, but years of ASO research and experimentation have identified the most influential factors. On the Apple App Store, the primary ranking signals include keyword relevance (how well your metadata matches the search query), download velocity (recent download volume and growth rate), ratings and reviews (both quantity and average score), update frequency, and engagement metrics like retention and session length.

Google Play shares many of the same factors but adds some unique ones. Because Google indexes the full long description, keyword density and placement in the description matter on Android. Google also considers uninstall rate as a negative signal. If users frequently install and then quickly uninstall your app, your rankings will suffer. Google Play additionally factors in the quality of your listing assets (screenshots, feature graphic, video) when determining eligibility for editorial features and recommendations.

Beyond search rankings, both stores use separate algorithms for top charts (heavily weighted toward download volume over a rolling window), category rankings (downloads within your primary and secondary categories), and editorial features (curated by human editors based on quality, design, and innovation). Understanding these different ranking contexts helps you optimize strategically. For search, keyword optimization is paramount. For charts, download campaigns and viral mechanics matter more. For editorial features, design quality and unique functionality are the deciding factors.