Unfortunately it is currently not possible to index app only content. However, it seems as if Google plans to support it in the future (it is currently tested with selected developers). You can express your interest using the following form: https://developers.google.com/app-indexing/app-only

Answer from dthulke on Stack Overflow
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Android Developers
developer.android.com › training › app-indexing
Making Your App Content Searchable by Google | Android Developers
Once you add Android App Links to your app, Google can crawl your app content through your website association and direct users on mobile devices to your app from their search results, allowing them to directly view your app's content instead ...
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AppSamurai
appsamurai.com › blog › app-indexing-how-to-index-your-app-on-google
Do You Know How To Do App Indexing On Google? November 2025 (Updated) | AppSamurai
January 7, 2025 - If you don’t have a website to connect your app to, but you still want to implement App Indexing you can complete a form to request App Indexing only for that app called Indexing App – Only Content.
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Stack Overflow
stackoverflow.com › questions › 26796146 › can-i-give-google-indexing-to-my-android-app-but-i-dont-have-a-website
Can i give google indexing to my android app but i don't have a website - Stack Overflow
Google indexes websites. If you have a unique app or other way for Google to recognize your app among many others, then submit your app to other app "markets" like Amazon or AppBrain.
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Google Support
support.google.com › googleplay › android-developer › answer › 6041489
App Indexing on Google Search - Play Console Help
There are two ways to delete an association and you only need to process one to remove or disassociate the websites. Sign in to Play Console. Click All apps. Select the app where you'd like to cancel the association. On the left menu, click Setup > Advanced settings. Select the "App Indexing" tab.
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Firebase
firebase.google.com › documentation › firebase app indexing
Firebase App Indexing | Firebase Documentation
Caution: The Google Search App for Android no longer uses local content indexed via Firebase App Indexing to provide results to users. Android App Links are the recommended way of linking users directly from search results, websites and other apps to specific content within your app.
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Google
developers.google.com › search central › google search central blog › indexing apps just like websites
Indexing apps just like websites | Google Search Central Blog | Google for Developers
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],[],[],["Google launched app indexing, enabling Googlebot to index Android app content.
Find elsewhere
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Ryte Wiki
en.ryte.com › wiki › App_Indexing
App Indexing - Ryte Wiki - The Digital Marketing Wiki
Previously, AdWords ads merely directed to the Google Play Store via a link, where users can download the app for the corresponding online store or service website. ... By referring to the applicable content in apps, Google app indexing focuses even more so on mobile content and Google search is adapted for all devices. It is conceivable that in the future, it will be technically possible to integrate app indexing into the search function without having to be logged in as an Android user.
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Smashing Magazine
smashingmagazine.com › 2017 › 01 › case-study-app-indexing-google-worth-the-effort
Is App Indexing For Google Worth The Effort? A Case Study — Smashing Magazine
View of an indexed app on a Nexus 6P running Android 7.0 when the app is not installed on the device. (Image: Bryson Meunier) (View large version) Theoretically, this is great for users because they can find relevant authoritative content in Google regardless of whether they prefer websites or apps, and it’s great for app developers and marketers because it allows apps to be exposed to a whole new audience outside of the app store, potentially increasing app usage and downloads.
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Actualizatec
actualizatec.com › en › blog › google-app-indexing-as-indexing-your-app-in-google
Google APP Indexing I ASO Course - Basic and Intermediate Level I Part 4
September 26, 2023 - However, these results are only shown when a user searches on a mobile phone, not on a computer, because they will be redirected directly to Google Play (if they are on an Android) or the App Store (if they are on an iPhone). Here's what it is and what steps you need to take to get your app indexed. ... Press play to see the episode of our ASO courseor read on for more details. Before giving an exact definition, we need to clarify three closely related and potentially conflicting concepts: SEO, ASO and App Indexing. SEO: Set of actions aimed at positioning a website or its content on Google or other search engines.
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Udonis
blog.udonis.co › mobile-marketing › the-importance-of-app-indexing
The Importance of App Indexing: Should You Implement it? | Udonis
December 20, 2023 - In practice, if you make a Google ... just websites. By supporting HTTP URLs in your app and adding the App Indexing SDK, you allow Google to crawl and index your app the same way he would with a web page....
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Fresh Egg Ltd
freshegg.co.uk › blog › technical-seo › indexing-and-structured-data › how-to-implement-app-indexing-for-google-search-your-questions-answered
How to Implement App Indexing for Google Search: Your Questions Answered
You can see Google’s full list of featured apps here. There will be no impact on your mobile website in terms of non-Android mobile traffic, as App Indexing only applies to Android users.
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Branch
branch.io › home › glossary pages › app indexing
App Indexing - Branch
December 5, 2023 - Branch deep linking created a nice out-of-the-box approach that eases the whole app indexing process dramatically. Functionally, if the user has the app installed, and you’ve configured it for deep linking, the user will open to the exact ...
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Search Engine Journal
searchenginejournal.com › sej › mobile seo
All You Need to Know About App Indexing | Search Engine Journal
August 22, 2016 - With apps, users can easily access web content that is already optimized for their smartphone without a mobile browser. If you use the mobile Google search, you often come across search results that offer opening content in an app or that request you to download an app. This is due to the so-called app indexing that avails app content for the Google search. App indexing was introduced in 2013 for Android apps and in May 2015 for iOS apps.
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Moz
moz.com › homepage › the moz blog › how to get your app content indexed by google
How to Get Your App Content Indexed by Google - Moz
March 31, 2021 - They are releasing a new and improved version of Google Now, "Now on Tap," in their latest OS update (Android M), which allows you to search content across your phone without navigating out of whatever app (or website) you are currently using.
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VentureBeat
venturebeat.com › mobile › google-search-starts-indexing-and-letting-users-stream-android-apps-without-matching-web-content
Google Search starts indexing and letting users stream Android apps without matching web content | VentureBeat
November 18, 2015 - Google’s push to organize the world’s information has recently been focused on figuring out the best way to index mobile apps. Today, the company started indexing Android apps that don’t have matching web content, and even began experimenting with letting users stream apps that they don’t have installed.
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Stack Overflow
stackoverflow.com › questions › 35507771 › app-indexing-how-not-to-map-all-my-website-to-the-app
android - app indexing - how not to map all my website to the app - Stack Overflow
You can rely on markups if you don't declare App-Website association. https://developers.google.com/app-indexing/android/app#declare-a-website-association