Subtitle — essence, technical limitations and how to write a subtitle

What Is an App Subtitle in ASO

Subtitle is a text field on the app page in the App Store, located directly below the name. In Google Play, the equivalent role is played by the short description, although technically these are different elements with different length limitations.

Subtitle appears on the app page below the Title and is used by App Store search algorithms to determine relevance. The user sees the Subtitle when viewing the app page, but does not see it in search results — only the Title (and short description in Google Play) is displayed there.

According to App Radar (2025), including relevant keywords in Subtitle increases the number of search queries for which an app ranks by an average of 40%. This is due to the cross-field indexing mechanism: words from Title and Subtitle are combined by the algorithm, forming additional search matches.

Subtitle in App Store vs Short Description in Google Play

Although both platforms have an element located below the name, their functions and limitations differ significantly. In the App Store, Subtitle (30 characters) is an independent search field. In Google Play, the short description (80 characters) appears in search results and is also indexed, but its primary function is conversion-oriented rather than search-oriented.

In Google Play, the short description is the first text the user sees in search results after the name. It should attract interest and encourage a visit to the app page. According to StoreMaven (2025), optimizing the short description increases the conversion rate from search results to the app page by 15–30%.

Evolution of Subtitle in App Store History

Subtitle appeared in the App Store in 2017 with the release of iOS 11. Before that, developers could only use the name (30 characters) and the keywords field (100 characters). The introduction of Subtitle provided an additional 30 characters of indexed space, allowing developers to expand semantic coverage without compromising Title readability.

Since its introduction, Subtitle has become a mandatory element of ASO optimization. Apps that do not use Subtitle lose up to 30% of potential search impressions because competitors with optimized Subtitles occupy more positions for additional queries. Today, an empty Subtitle is a clear sign of unprofessional ASO.

How Subtitle Complements Title: Cross-Field Indexing

Cross-field indexing is a mechanism of the App Store algorithm where words from Title and Subtitle are combined into a single index. This means a search query can consist of a word taken from Title and a word taken from Subtitle, and the app will be deemed relevant.

Example: Title = “Music Player”, Subtitle = “MP3, Equalizer”. A search for “MP3 Player” will find this app, even though the word “Player” is in Title and “MP3” is in Subtitle. This mechanism allows maximizing semantic coverage with limited metadata space: by combining words from two fields, you can cover more search queries than if each field were considered in isolation.

According to Sensor Tower (2025), approximately 35% of search queries for which an app ranks are formed through cross-field combinations of Title and Subtitle. This confirms the importance of coordinated planning of both fields as a unified semantic system rather than independent elements.

Choosing Keywords for Subtitle Considering Title

The complementarity rule: Subtitle should contain keywords that are absent from Title but complement it. If Title contains “Music Player”, Subtitle should not repeat “music” or “player” — these words are already in the index. Instead, Subtitle should add new terms: “MP3, Equalizer, Bass Boost”.

An exception is if a keyword is so important that repeating it in Subtitle provides an additional relevance signal. For example, if Title contains “Photo Editor” (10 characters) and Subtitle starts with “Photo” (5 characters), then combined with Subtitle “Photo Filters, Collage” a stronger signal is formed for the query “photo”. However, this technique should be used sparingly — each repetition reduces the efficiency of using limited space.

Subtitle as a Conversion Element

Beyond its search function, Subtitle serves a conversion role — it informs users about additional app features. When browsing the page, the user sees the Subtitle below the name and gets a more complete picture of the functionality. Subtitle should answer the question “What else can this app do?”

Example: Title = “SnapEdit — Photo Editor” (the user understands this is a photo editor). Subtitle = “Filters, Collage, Retouch” (the user learns the app has filters, collages, and retouching). This pair works more effectively than if all these words were crammed into Title, making it unreadable.

Subtitle Limitations and Technical Requirements

Subtitle in the App Store has a strict limit of 30 characters. This includes letters, numbers, spaces, and special characters. Exceeding the limit is not allowed by App Store Connect. The recommended length is 25–30 characters for maximum utilization of available space.

Short description in Google Play — up to 80 characters. Unlike the App Store, Google does not impose strict minimum length requirements, but an empty short description is a missed opportunity for conversion and search. The recommended length is 60–80 characters.

Special characters in App Store Subtitle: commas are used to separate keywords, hyphens and dashes for visual separation. In Google Play, the short description can contain emoji — according to Swrve (2025), emoji in the short description increase CTR in search results by 12–18% for Entertainment and Social category apps.

• App Store Subtitle: max 30 characters, indexed, displayed on the app page below Title.
• Google Play Short Description: max 80 characters, indexed, displayed in search results below the name.
• Prohibited: spammy repetitions, profanity, misleading statements.
• Moderation: App Store checks Subtitle for consistency with app functionality.
• Updates: Subtitle can be changed with each metadata update without publishing a new version.

Subtitle in Different iOS Versions

Subtitle display changed with the release of iOS 15 and later versions. Starting with iOS 15, Subtitle appears on the app page more prominently — below Title with an enlarged font. This increased its conversion significance: users began to pay more attention to the subtitle when deciding whether to install.

Before iOS 15, Subtitle was displayed in a small font and often went unnoticed by users. With the improved visual highlighting of Subtitle in iOS 15–18, its role in conversion has grown, requiring a more careful approach to wording. Subtitle should be readable and informative, not just a set of comma-separated keywords.

Strategies for Writing Subtitle for iOS and Android

Subtitle strategy depends on category competition, Title length and structure, and the platform. There is no universal recipe, but there are proven approaches that deliver consistent results.

Strategy 1: Keyword supplementation. Used when Title contains 1–2 keywords and you need to expand semantic coverage. Subtitle contains 2–4 additional keywords relevant to the app’s functionality. Example: Title = “Music Player”, Subtitle = “MP3, Equalizer, Bass Boost”. This is the most common strategy, suitable for most categories.

Strategy 2: Audience refinement. Used when the app targets a specific audience. Subtitle clarifies who the app is for. Example: Title = “Fitness Workout”, Subtitle = “For Women, Weight Loss”. This strategy is effective in Health & Fitness, Education, and Lifestyle categories.

Strategy 3: Emoji and visual highlighting. Used in Google Play (short description) to attract attention in search results. Example: Title = “Fitness Workout”, Short Description = “Personal Trainer — Lose Weight & Build Muscle”. Important: emoji should match the app’s theme and not look spammy.

def optimize_subtitle(title, keywords, max_len=30):
    """Subtitle optimization considering cross-field indexing."""
    title_words = set(title.lower().split())
    subtitle_keywords = []
    for kw in keywords:
        kw_clean = kw.lower().strip()
        # Skip words already present in the Title
        if kw_clean not in title_words:
            subtitle_keywords.append(kw_clean)
    # Form a string within the limit
    result = ", ".join(subtitle_keywords)
    return result[:max_len]

title = "Photo Editor Pro"
keywords = ["filters", "retouch", "collage", "photo"]
subtitle = optimize_subtitle(title, keywords)
print(subtitle)

This Python function automatically generates a Subtitle by excluding words already present in Title and staying within the character limit. This is a basic building block for ASO automation tools that generate metadata based on a semantic core.

Coordinated Planning of Title and Subtitle

Title and Subtitle should be planned as a unified system, not as independent fields. The process: first define the set of target keywords (10–15 for the App Store), then distribute these words between Title (first 30 characters) and Subtitle (next 30 characters) considering maximum coverage of cross-field combinations.

When distributing, it is important to consider query priority: the most frequent and competitive queries go into Title, the rest into Subtitle. Queries that only work in combination (e.g., “photo” + “editor” = “photo editor”) should be placed in different fields so that cross-field indexing creates the needed combination.

Common Mistakes When Writing Subtitle

Repeating words from Title — the most common mistake. If Title contains “Photo Editor” and Subtitle contains “Photo Filters”, the word “Photo” is duplicated, reducing the efficiency of using 30 characters. Every character of Subtitle should carry new semantic information.

Using stop words — the second most frequent mistake. Words like “and”, “the”, “for”, “with” take up space but add no search weight. In App Store Subtitle, every word should be a potential search query. An exception is Google Play, where the short description must be readable for the user.

Ignoring display on different devices — Subtitle may be truncated on devices with small screens. It is recommended to check Subtitle display on iPhone SE screens and Android devices with 4.7–5.5 inch diagonals.

Examples of Effective Subtitles from Top Apps

Analysis of top app Subtitles across various categories helps identify common patterns and adapt them for your product. Below are Subtitle examples from apps consistently ranking in the top 10 for their categories.

Photo & Video category: VSCO — Title = “VSCO — Photo & Video Editor”, Subtitle = “Filters, Effects, Retouch”. Subtitle complements Title with three key features, each being a separate search query. Cross-field combinations: “video filters”, “video effects”, “photo retouch”.

Productivity category: Notion — Title = “Notion — Notes, Docs, Projects”, Subtitle = “Wikis, Tasks, AI Writing”. Subtitle expands the functional description by adding “Wikis” and “AI Writing” — words not present in Title. This allows the app to rank for additional queries related to knowledge bases and artificial intelligence.

Health & Fitness category: MyFitnessPal — Title = “MyFitnessPal — Calorie Counter”, Subtitle = “Diet & Macro Tracker”. Subtitle clarifies the scope: not just calorie counting, but diet and macronutrient tracking. For Google Play, this same app’s short description contains emoji and a call to action.

• VSCO: “Filters, Effects, Retouch” — functional supplementation, 3 key queries.
• Notion: “Wikis, Tasks, AI Writing” — functionality expansion, trending AI query.
• MyFitnessPal: “Diet & Macro Tracker” — audience and functionality clarification.
• Headspace: “Meditation & Sleep” — simple and clear keywords.
• Duolingo: “Learn Spanish, French & More” — listing languages as key queries.

What Competitor Examples Teach Us

Trend 2024–2025 — including AI queries in Subtitle. Apps using artificial intelligence add “AI” to Subtitle, even if it is not reflected in Title. For example, “AI Writing”, “AI Photo Editor”, “AI Fitness Coach”. According to Sensor Tower (2025), queries with “AI” grew by 340% in App Store search during 2024.

Specificity beats generalizations. Subtitle “Diet & Macro Tracker” works better than “Health & Wellness” because users search for specific functions, not general categories. It is recommended to specify concrete app features in Subtitle rather than generic category tags.

Tools for Analyzing Competitor Subtitles

Sensor Tower is the primary tool for monitoring Subtitle changes among competitors. The “Metadata History” feature shows when a particular app changed its Subtitle, what variants were used, and how it affected rankings. It allows you to identify successful and unsuccessful Subtitle changes in a category.

App Radar provides a metadata comparison feature: you can load several apps and see their Title, Subtitle, and keywords on one screen. This is convenient for analyzing competitor semantic strategies and identifying common keywords in a category.

App Annie (data.ai) is less focused on daily Subtitle monitoring but provides data on search queries that generate traffic for each app. This allows you to assess which words in competitor Subtitles actually drive installs and which just take up space.

Free Analysis Methods

Manual monitoring through search results: every 1–2 weeks, check the pages of the top 10 apps in the target category and record their Subtitles. For the App Store, you can use the iTunes API for automated data collection. The API returns Title, Subtitle, and description in JSON format, allowing you to automate collection without paid tools.

For Google Play, the short description can be collected via the Google Play Developer API or through HTML parsing of the app page. However, Google actively blocks automated requests, so official APIs are recommended for regular monitoring.