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ASO Glossary

Plain-language definitions of the App Store Optimization terms that actually move installs — written by the team that does this for funded app startups every day. 35 terms and growing.

Foundations

App Store Optimization (ASO): Is the practice of improving an app's visibility and conversion in app store search and browse so it earns more organic installs without paying per download.

App Store mechanics

Cross-Localization: Is the app store behavior where a single country storefront indexes keywords from more than one localization — letting you rank for extra terms by filling secondary localizations users in that country never see.
Localization: Is adapting an app's store listing — metadata, screenshots, and keywords — to a specific language and market so it ranks and converts in that audience's own language.
Storefront: Is a single country or region's version of the app store, with its own charts, search rankings, featuring, and set of indexed localizations.
Primary Localization: Is the default language of a storefront — the metadata most users in that country see, and the first localization the app store indexes for keyword search there.
Secondary Localization: Is an additional localization whose keyword field the app store also indexes in a storefront — giving you extra keyword coverage that most users in that country never see.

Metadata

Keyword Field: Is the app store's hidden 100-character metadata field where you list comma-separated keywords that count toward search ranking but are never shown to users.
App Title (App Name): Is the most heavily weighted ranking field on both stores — up to 30 characters on the app store — where your brand name and single most valuable keyword belong.
Subtitle: Is the app store's 30-character line beneath the app name — the second-strongest ranking field and a key conversion hook on the product page.
Promotional Text: Is a 170-character app store field above the description that you can update anytime without a new app release — but it does not affect keyword ranking.
App Description: Is the long-form text on a store listing — on google play it directly affects keyword ranking, while on the app store it is conversion-only and not indexed for search.
Metadata Character Limits: Are the fixed maximum lengths apple and google enforce on each listing field — exceed them and your text is silently truncated at submission.

Discovery & ranking

App Store Search Algorithm: Is the system that ranks apps for a search query based on keyword relevance in metadata combined with performance signals like downloads, conversion, and ratings.
Ranking Factors: Are the inputs an app store uses to order search and chart results — split between on-metadata relevance signals and off-metadata performance signals.
Keyword Difficulty: Is a score estimating how hard it is to rank on the first page for a keyword, based on the strength and competition of the apps already ranking for it.
Search Volume (Popularity Score): Is an estimate of how often users search a keyword — apple expresses it as a 5–100 popularity score, and it tells you the traffic a top ranking could deliver.
Long-Tail Keyword: Is a longer, more specific multi-word search phrase with lower volume but higher intent and lower competition — often the fastest path to first-page rankings for a new app.
Branded Keyword: Is a search term containing a brand or app name — either your own (protecting it) or a competitor's (bidding or ranking against it).
Keyword Stuffing: Is overloading metadata with repeated or irrelevant keywords in a way that reads unnaturally, wastes ranking weight, and can trigger store rejection or hurt conversion.
Keyword Rank: Is your app's position in the search results for a specific keyword in a specific storefront — the core metric aso is judged by.
Browse vs. Search: Are the two organic discovery paths in an app store — search (users typing a query) and browse (charts, categories, and editorial featuring) — which reward different optimizations.
Category Ranking: Is your app's position within its app store or google play category chart, driven mainly by download velocity and a strong browse-discovery surface.

Metrics

Impressions: Count how many times your app listing or icon was shown to users across search, browse, and referrals — the top of the aso funnel before taps and installs.
Organic Installs: Are app downloads that come from unpaid discovery — search, charts, browse, featuring, and referrals — rather than from paid advertising.

Conversion

Conversion Rate (CVR): Is the share of users who install your app after viewing its listing — the single metric that turns visibility into installs and feeds back into ranking.
Screenshots: Are the listing's primary conversion asset — the visual story of your app that shoppers scan in seconds and that does most of the work of earning an install.
App Preview (Video): Is the short autoplaying video on a store listing that demonstrates the app in motion — a strong conversion lever when it shows real value in the first few seconds.
App Icon: Is the small square mark that represents your app everywhere it appears — the first impression in search and browse, and a meaningful conversion and tap-through driver.
Ratings & Reviews: Are the star score and written feedback on your listing — a top conversion driver and a ranking signal, where both the average and the volume and recency matter.

Apple features

Product Page Optimization (PPO): Is apple's native a/b testing feature that lets you test up to three variant treatments of your icon, screenshots, or app preview against the default and measure conversion.
Custom Product Pages (CPP): Are additional app store product pages — up to 35 — each with its own screenshots, preview, and promotional text, reachable by unique urls to match specific audiences or campaigns.
Apple Search Ads (ASA): Is apple's paid search advertising platform that places sponsored app results at the top of app store search — a paid channel that complements organic aso.
In-App Events: Are timely, time-limited happenings inside your app — like a tournament, premiere, or challenge — that apple lets you surface as discoverable event cards across the app store.

Google Play features

Custom Store Listings (Google Play): Are google play's audience-targeted listing variants that show different metadata and creative to specific countries, install states, pre-registration users, or ad campaigns.
Store Listing Experiments (Google Play): Are google play's built-in a/b testing tool for comparing listing variants — icon, screenshots, text, and more — against the current default to find what converts best.

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