App Store Optimization (ASO)

Search visibility and conversion optimization for App Store product pages. This skill covers strategic metadata decisions -- which keywords to target, how to structure descriptions for conversion, and how to use Custom Product Pages and in-app events for discoverability. For metadata compliance rules (character limits, screenshot device requirements, rejection triggers), see the app-store-review skill.

Contents

• Overview
• Title and Subtitle Strategy
• Keyword Field Strategy
• Description Structure
• Promotional Text
• Screenshot and Preview Optimization
• In-App Review Prompts
• Custom Product Pages
• In-App Events
• Product Page Optimization
• Ratings and Review Management
• Localized Metadata Optimization
• Common Mistakes
• Review Checklist
• References

Overview

ASO has two pillars:

1. Search visibility -- ranking for relevant queries so users find the app.
2. Conversion rate -- convincing users who land on the product page to download.

Apply this skill when a developer asks about improving discoverability, keyword strategy, download conversion, or any product page element that affects either pillar.

For metadata format rules and compliance guardrails, see the app-store-review skill. This skill assumes the developer is working within those constraints and focuses on strategy.

When producing an ASO plan or ownership split, explicitly separate Visibility from Conversion. Visibility covers search and browse discoverability: app name, subtitle, keyword field, primary category, localization, ratings and reviews, relevant In-App Events, and Custom Product Pages. Conversion covers the product-page decision path: screenshots, app previews, description, promotional text, Custom Product Page messaging, Product Page Optimization tests, and alignment between public claims, screenshots, and the real in-app UI.

Boundary rule: ASO owns listing strategy, keyword/message fit, screenshots, promotional text, Custom Product Pages, Product Page Optimization, localization, In-App Event positioning, ratings strategy, and lightweight review-prompt timing. app-store-review owns review compliance, PrivacyInfo.xcprivacy, ATT wording, and submission guardrails; ASO only cross-checks that public claims and screenshots are accurate. storekit owns purchase implementation, subscription paywall code, entitlement checks, and monetization mechanics.

For any full ASO plan, include these explicit checklist items so important App Store mechanics do not get dropped:

• Visibility: app name, subtitle, keyword field, primary category, localization, ratings/reviews, In-App Events if relevant, and Custom Product Pages with assigned keyword search visibility.
• Conversion: description hook, first screenshots or app preview, promotional text, Custom Product Page message fit, Product Page Optimization, and public-claim/screenshot accuracy.
• Experimentation: one PPO hypothesis, up to three treatments, selected localizations, target metric, and decision rule.
• Review prompts: positive trigger, bad-trigger avoidance, and the note that StoreKit decides whether a request displays a prompt.

Do not leave these implicit: reject high-volume keywords, state CPP capacity as 70 pages, list up to three PPO treatments, and mark In-App Events and ratings ASO-owned.

Title and Subtitle Strategy

Apple indexes the app name and subtitle for search. Together they provide 60 characters (30 + 30) of indexed, high-visibility keyword real estate.

Positioning framework

Use Brand -- Keyword when the brand already has recognition, Keyword -- Brand when a new app must compete on category terms, and a blended name when the brand naturally contains a relevant keyword.

Rules

• Do not repeat words between the name and subtitle -- Apple indexes both, so duplicates waste characters.
• Front-load the highest-value keyword in whichever field has more room.
• Avoid generic filler words ("the", "best", "app") -- they consume space without search value.
• The subtitle should communicate the primary value proposition, not a tagline.

Keyword Field Strategy

The keyword field is 100 characters, comma-separated, no spaces after commas. See the app-store-review skill for the full format rules. This section focuses on which keywords to choose and how to prioritize them.

Research process

1. Competitor audit -- identify the top 5-10 competitors in the category and note which keywords appear in their titles, subtitles, and descriptions.
2. Category analysis -- identify terms users associate with the app's category that competitors may be missing.
3. Search Ads signals -- run Apple Search Ads discovery campaigns to surface high-intent queries with actual impression and tap data.
4. Iterate each release -- update keywords based on Search Ads performance, App Analytics impressions, and conversion data.

Prioritization

Rank candidate keywords by three factors:

Relevance always wins. A high-volume keyword that does not describe the app will get impressions but not conversions.

For search relevance, prioritize user intent first, then metadata fit. Always account for the primary category alongside the app name, subtitle, and keyword field; do not repeat category terms in the keyword field.

Tactical rules

• Deduplicate against title and subtitle -- Apple already indexes those words.
• Use singular forms only -- Apple matches both singular and plural from singular.
• Omit the category name -- Apple adds the app's primary category to search automatically.
• Omit spaces after commas -- they count against the 100-character limit.
• Consider abbreviations and common misspellings if they are genuine search terms.
• Reserve space for the most relevant, highest-intent terms; do not spend characters on terms that only weakly describe the app.

See: references/keyword-research-methodology.md for the full research process, scoring framework, and indexing details.

Description Structure

Apple's search guidance centers text relevance on the app name, subtitle, keywords, and primary category, plus behavior signals such as downloads, ratings, and reviews. Treat the description as conversion copy, not a place to stuff extra search terms: users who expand it are evaluating whether to download.

Four-part structure

1. Hook (first 1-3 lines) -- the only text visible before the "more" fold. Lead with the strongest benefit or differentiator. This is the most important copy on the page.
2. Feature highlights -- 4-6 short feature descriptions. Use Unicode bullet characters (•) since the App Store does not render markdown. Focus on outcomes, not technical details.
3. Social proof -- awards, press quotes, user count milestones, or notable ratings. One or two lines.
4. Call to action -- a closing line encouraging the download. Keep it short and benefit-focused.

Formatting notes

• The App Store does not render markdown, HTML, or rich text. Use plain text with Unicode characters for structure.
• Short paragraphs with line breaks between them. Walls of text kill conversion.
• Write per locale -- translate the structure, not the words. See Localized Metadata Optimization.

Promotional Text

Promotional text appears above the description, is limited to 170 characters, and can be updated at any time without submitting a new app version.

Rotation strategy

Update promotional text for feature launches, seasonal moments, awards or press, promotions, and in-app events. Do not leave it static across releases; if there is nothing timely to promote, rotate between the app's strongest selling points.

Screenshot and Preview Optimization

Most users never scroll past the first 3 visible screenshots. These slots determine whether a user engages with the full product page or moves on.

First 3 screenshots

• Lead with the primary value proposition -- the screen that best demonstrates why someone should download.
• Never place onboarding, splash, or loading screens in the first 3 slots.
• Each screenshot should demonstrate a different benefit or feature.

Caption writing

• Write benefit-oriented captions, not feature labels. "Never miss a deadline" converts better than "Calendar View".
• Keep captions to 2-5 words above the screenshot and one short line below.
• Use action verbs: "Track", "Share", "Discover", "Build".

Ordering strategy

Use slot 1 for the primary value proposition, slot 2 for the core differentiator, slot 3 for the next strongest feature, and later slots for supporting features, social proof, or edge cases.

App preview video

If a preview video is present, it occupies the first slot. The first frame becomes the poster image when autoplay is disabled -- choose a frame that works as a standalone screenshot.

For screenshot device requirements and compliance rules, see the app-store-review skill.

In-App Review Prompts

StoreKit provides RequestReviewAction for SwiftUI and AppStore.requestReview(in:) for UIKit. Use this section for timing strategy; for the full StoreKit API surface, see the storekit skill.

System behavior

• The system enforces a maximum of 3 prompts per 365-day period per device for users who have not yet rated the app.
• The API is a request, not a guarantee -- StoreKit decides whether to show the prompt.
• During development, the prompt always appears. In TestFlight, it never appears.

Prompt timing

Good triggers include completing a meaningful task, achieving a milestone or streak, a positive in-app moment, or several active sessions. Bad triggers include first launch, onboarding, errors, crashes, failed transactions, or direct button-tap pre-screens. Do not gate the prompt behind a "Rate this app?" dialog -- Apple discourages intercepting the system prompt and may reject apps that pre-screen.

Persistent review link

For a settings screen or "Rate us" option, link directly to the App Store review page using the URL format:

https://apps.apple.com/app/id{APP_ID}?action=write-review

This opens the review writing screen directly and is not subject to the 3x/year system limit.

Custom Product Pages

Custom Product Pages allow up to 70 variant product pages per app. Each variant can have different screenshots, app preview videos, promotional text, and assigned search keywords -- tailored to a specific audience or acquisition channel.

When recommending Custom Product Pages, explicitly mention both the 70-page capacity and assigned-keyword search visibility, then map each page to a distinct audience, message, keyword/ad intent, and measurement plan.

Use cases

Use separate pages for paid search ad groups, social campaigns, feature-specific landings, seasonal campaigns, and other acquisition paths where the first screenshot or promotional text should match a distinct user intent.

Setup

• Each Custom Product Page gets a unique App Store URL usable in ad campaigns, deep links, and web pages.
• Approved pages can also appear in App Store search for assigned keywords from the latest approved app version.
• Pages can be localized independently.
• Create pages in App Store Connect under the Custom Product Pages tab.
• Name pages descriptively for internal tracking (e.g., "Search-FitnessTracking", "Social-HolidayCampaign").

See: references/product-page-variants.md for setup details, URL structure, and campaign mapping strategy.

In-App Events

In-app events surface in App Store search results, on the Today tab, and in personalized recommendations. They increase visibility during the event window and can re-engage lapsed users.

Event types

Choose the Apple event badge that matches the actual in-app experience: Challenge, Competition, Live Event, Major Update, New Season, Premiere, or Special Event. Do not manufacture events without real time-bound content.

Metadata limits

Event name is 30 characters, short description 50, long description 120, and the event card image is required at 16:9 (1920x1080 or similar).

Strategy

• Schedule events around feature releases, seasonal moments, or content drops.
• Write the event name and short description with search-result context in mind; they appear on event cards in surfaces such as Search and the Today tab.
• Events appear on the product page and can appear in search results, giving the app a visual card that can increase tap-through rate when the event is timely and relevant.
• Overlap events strategically: end the current event as the next one begins to maintain continuous search visibility.

See: references/product-page-variants.md for event scheduling templates.

Product Page Optimization

App Store Connect provides native testing for product page elements.

What can be tested

• App icon (alternate icons)
• Screenshots (order, content, captions)
• App preview video

Each test can include up to three treatments against the original product page, which serves as the default baseline.

Test design

• Run tests for a minimum of 7 days to account for day-of-week variation.
• Ensure sufficient traffic for statistical significance -- low-traffic apps may need longer test durations.
• Test one hypothesis at a time as a methodology choice (e.g., screenshot order OR caption copy, not both simultaneously), even when App Store Connect allows multiple treatments.
• Select the localizations included in the test; all supported localizations are selected by default.
• A test runs for up to 90 days or until manually stopped. Results appear in App Analytics after at least five first-time downloads are associated with the test.
• PPO recommendations should name the hypothesis, up to three treatments, selected localizations, target metric, and decision rule.

Interpreting results

• Focus on conversion rate lift (impressions-to-downloads), not absolute download numbers.
• App Store Connect reports conversion rate, lift, and confidence. Treat 90%+ confidence as the threshold for "Performing Better" or "Performing Worse" decisions.
• After applying a winner, wait before starting the next test to establish a clean baseline.

Ratings and Review Management

Ratings and reviews appear on the product page and in search results, influence App Store search ranking, and affect conversion. The strategy is to earn more positive, recent feedback by prompting only after successful user moments and by responding constructively to issues.

Review response strategy

• Respond to negative reviews in App Store Connect -- a professional response improves perceived quality even without changing the rating number.
• Acknowledge the issue, state what is being done (or has been fixed), and keep the tone neutral.
• Use review language as customer research: users often describe their goals, frustrations, and category vocabulary in words that can improve future metadata and screenshot messaging.

Rating reset

When submitting a new version, you can choose to reset the displayed rating. Use this strategically:

Reset only when the displayed rating is significantly below the app's current quality after major improvements. Do not reset a strong, representative rating; do not reset for ordinary bug fixes; and wait for stabilization after a risky redesign.

Localized Metadata Optimization

Localizing ASO is not the same as translating the app UI. Keyword strategy, descriptions, and screenshot captions must be researched and written per market, not machine-translated from the primary locale.

Key principles

• Research keywords per market. The most-searched term for "photo editor" in Japanese is not a direct translation of "photo editor."
• Rewrite descriptions per locale. Adapt the hook-features-proof-CTA structure to local conventions and selling points.
• Localize each metadata surface. App Store guidance explicitly calls out localized descriptions, keywords, app previews, and screenshots; do not assume direct translations or unsupported cross-locale indexing behavior.
• Localize screenshot captions. Captions in the user's language convert better than untranslated English.

For in-app string localization (String Catalogs, FormatStyle, right-to-left layout), see the ios-localization skill.

Common Mistakes

1. Duplicating title/subtitle/category words in the keyword field.
2. Writing feature-descriptive captions instead of benefit-oriented screenshot copy.
3. Translating keywords instead of researching per-market search terms.
4. Prompting for reviews after onboarding, errors, crashes, or failed transactions.
5. Ignoring the first three screenshot slots or leading with onboarding/splash screens.
6. Leaving promotional text static across releases and campaigns.
7. Running PPO tests without enough duration, traffic, or a single clear hypothesis.
8. Adding spaces after commas in the keyword field.
9. Reusing identical assets across all Custom Product Pages.
10. Ignoring negative App Store reviews instead of responding and learning from customer language.

Review Checklist

• Title uses high-value keyword alongside brand name; no words repeated in subtitle
• Subtitle communicates primary value proposition within 30 characters
• Keyword field uses all 100 characters; no spaces after commas; no duplicates of title/subtitle words; singular forms only
• Description follows hook-features-proof-CTA structure; first 3 lines compelling before the fold
• Promotional text is current and relevant to the latest release or event
• First 3 screenshots show highest-value screens with benefit-oriented captions
• App preview video (if present) leads with the core feature in the first 5 seconds
• requestReview() is placed after a positive user moment, not on first launch or after errors
• Custom Product Pages created for distinct acquisition channels with tailored screenshots
• In-app events configured for upcoming launches, seasons, or feature releases
• Metadata localized with per-market keyword research for all supported locales
• Compliance cross-check: all metadata passes the app-store-review skill checklist before submission

References

• Keyword research methodology: references/keyword-research-methodology.md
• Custom Product Pages, A/B testing, and in-app events: references/product-page-variants.md