App Store Optimization (ASO) Guide

App Store Optimization (ASO) is the process of improving an app's visibility and conversion rate in app stores such as the Apple App Store. Good ASO helps the right users discover your app through search and browse, and convinces them to install once they land on your product page. It is often described as "SEO for apps".

A large share of app downloads begins with an App Store search. Because organic installs are essentially free, even small ASO improvements compound over time. For indie developers with limited ad budgets, ASO is frequently the single most cost-effective growth channel.

Keywords are the foundation of ASO. Identify the words and phrases your ideal users type when looking for an app like yours, then study which keywords your competitors already rank for. Prioritise keywords with meaningful search volume and realistic competition.

You can do this in minutes with the Appstro App Store keyword tool.

Your app name (up to 30 characters) and subtitle (up to 30 characters) carry the most ASO weight on the Apple App Store. Lead with your brand, then include your most important keyword naturally. Avoid keyword stuffing — clarity and conversion matter as much as ranking.

Apple gives you a hidden 100-character keyword field. Separate keywords with commas, do not repeat words already in your title or subtitle, skip spaces, and avoid plurals where the singular already covers them. Every character counts.

Visual assets drive conversion. A clear, distinctive icon and benefit-led screenshots turn impressions into installs. Because conversion rate feeds back into rankings, strong creative is part of ASO, not separate from it.

Higher ratings improve both ranking and conversion. Prompt happy users to rate the app at the right moment, respond to reviews, and watch sentiment over time. Reviews also reveal feature requests and pain points worth addressing.

Localising your metadata for different storefronts can unlock large amounts of new organic traffic. What ranks in the United States may differ completely in Japan, Germany or Brazil — research keywords per country rather than assuming one list fits all 55+ markets.

ASO is continuous, not one-and-done. Track your keyword rankings, ratings and category position, change one variable at a time, and keep the winners. Treat your product page as something you optimise every release.