App Store Glossary

Key terms and definitions for App Store Optimization, app marketing, and screenshot design.

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A/B Testing: A method of comparing two versions of an App Store product page to determine which performs better. Apple’s Product Page Optimization feature lets developers test different screenshots, icons, and promotional text to improve conversion rates. Read our A/B testing guide →
App Store Connect: Apple’s web-based portal where developers manage their app listings, upload builds, configure pricing, submit screenshots, and view analytics. All App Store metadata and creative assets are uploaded through this platform.
App Store Optimization (ASO): The process of improving an app’s visibility and conversion rate within the App Store. ASO involves optimizing keywords, screenshots, icons, descriptions, and other metadata to rank higher in search results and drive more downloads. Read our ASO optimization guide →
Aspect Ratio: The proportional relationship between the width and height of an image. App Store screenshots must match specific aspect ratios determined by the target device. For example, iPhone 16 Pro Max screenshots use a 1290×2796 pixel dimension with a roughly 9:19.5 aspect ratio. Read our screenshot size guide →

Conversion Rate: The percentage of users who view an App Store product page and proceed to download the app. Screenshot quality is one of the most significant factors influencing conversion rate, as many users make download decisions based on visuals alone. Read our design tips for better conversion →

Device Frame: A graphical representation of a physical device (iPhone, iPad, MacBook) used to wrap an app screenshot. Device frames add context and a polished, professional look to App Store marketing images. Screenlift supports frames for the latest Apple devices. Read our device frame guide →
Dynamic Island: A pill-shaped interactive area at the top of iPhone 14 Pro and later models that replaces the notch. When designing screenshots for these devices, the Dynamic Island is part of the device frame and should not be obscured by important UI content.

First Impression Screenshots: The first three screenshots visible in App Store search results without scrolling. These are the most critical images in your screenshot set because they determine whether a user taps through to the full product page or scrolls past. Read our first impression design tips →

Impression: A single instance of your app being displayed in App Store search results, browse pages, or featured sections. Impressions are tracked in App Store Connect analytics and represent the top of your marketing funnel before taps and downloads.

Keyword Optimization: The practice of researching and selecting specific words and phrases for your app’s title, subtitle, and keyword field to improve search ranking. Effective keyword optimization balances search volume, relevance, and competition. Read our keyword strategy guide →

Localization: Adapting your App Store listing—including screenshots, descriptions, and metadata—for different languages and regions. Localized screenshots with translated text overlays can significantly improve conversion rates in non-English markets. Read our localization guide →

Metadata: All textual and visual information associated with your App Store listing. This includes the app name, subtitle, description, keywords, screenshots, app preview videos, and promotional text. Metadata is managed through App Store Connect.

Notch: The sensor housing cutout at the top of iPhone X through iPhone 14 models. The notch is visible in device frames for these models and should be accounted for when positioning text and UI elements near the top of the screen.

Pixel Density (PPI): Pixels Per Inch—a measurement of display resolution. Apple’s Retina displays use high pixel density (typically 2x or 3x) to render sharp text and images. App Store screenshots must be provided at the native pixel resolution of each target device.
Product Page: The full App Store listing for your app, including screenshots, description, ratings, reviews, and the download button. The product page is where the final download decision happens, making it the most important conversion point. Read our product page optimization guide →
Product Page Optimization: An Apple feature that allows developers to create up to three alternative versions of their product page and test them against the original. Each treatment can have different screenshots, icons, and promotional text to find the highest-converting combination. Read our A/B testing guide →

Retina Display: Apple’s branding for high-resolution screens that pack enough pixels that individual dots are indistinguishable to the human eye. All modern iPhones, iPads, and Macs use Retina displays, which is why App Store screenshots require high-resolution exports.

Safe Area: The region of the screen that is guaranteed to be free of system UI elements such as the status bar, home indicator, Dynamic Island, or rounded corners. Important app content should be placed within the safe area to avoid being clipped or obscured.
Screenshot Set: The complete collection of screenshots uploaded for a specific device size category in App Store Connect. Each set can contain up to 10 screenshots and should tell a cohesive story about your app’s features and value proposition. Read our screenshot planning tools →
Screenshot Strategy: The deliberate planning of screenshot order, messaging, and visual style to maximize conversions. A strong strategy typically leads with the value proposition, follows with key features, and closes with social proof or detailed views. Read our screenshot strategy tips →
sRGB: Standard Red Green Blue—the default color space for web content and most App Store screenshots. sRGB ensures consistent color reproduction across different displays. For wider color accuracy, Apple also supports Display P3 color space.
Subtitle: A short text string (up to 30 characters) displayed directly below your app name in App Store search results. The subtitle is a valuable ASO asset that should communicate your app’s core purpose or key differentiator clearly and concisely.

Tap-Through Rate: The percentage of users who see your app in search results or browse pages (impressions) and tap to view the full product page. High-quality first impression screenshots are the primary driver of tap-through rate. Read our guide to increasing downloads →