Can App Indexing Really Boost Your Mobile Traffic by 90%?

What Exactly is App Indexing?

App indexing allows Google to crawl and index the content present in native mobile applications. In practical terms, a user performing a mobile search may see results directly linking to specific screens in your app, rather than just your mobile site.

This mechanism is based on a simple principle: you create deep links that associate standard web URLs with pages of your app. Google crawls these associations using matching files, and it can then offer direct opening in the app when it's installed, or redirect to the mobile site otherwise.

Why Does Google Highlight These Figures So Much?

The 90% increase in clicks and the 250% increase in impressions are data provided by Google itself, based on feedback from early adopter developers. These figures are not market averages, but rather selected success cases. Google has a vested interest in promoting adoption: more indexed apps mean more crawled content, resulting in a richer index and a better mobile user experience.

However, these results do not come from nowhere. The user experience is objectively better when one can access app content directly rather than going through a sometimes less optimized mobile site. Applications generally offer better performance, smoother interactions, and a more engaging user context.

What Are the Conditions to Benefit from These Gains?

First condition: your application must be properly implemented with the Firebase App Indexing SDK (Android) or Universal Links (iOS). The deep links must match the structure of your website exactly, and the verification files (assetlinks.json for Android, apple-app-site-association for iOS) must be configured correctly.

Second condition: your app content must be relevant and engaging. An app that mindlessly duplicates the mobile site without added value will not generate these gains. Google favors applications that offer a true differentiated user experience, with cleverly utilized native features.

• The technical implementation must be flawless: functional deep links, valid verification files, consistent web/app URL matching
• The announced figures are success cases, not averages: not all sites will see these gains
• App indexing works in addition to the mobile site, not as a replacement: Google continues to crawl and index your website
• The benefit is maximum when the app provides a superior user value compared to the mobile site (performance, native features, personalization)
• Users without the app installed are redirected to the mobile site: therefore, indexing does not penalize non-users of the application

Are These Figures Consistent with Field Observations?

Let’s be honest: the 90% increase in clicks seems like cherry-picking at its finest. In my audits, I’ve seen significant gains, sure, but rarely of this magnitude. Applications that reach these heights are typically dominant players in their sector with a substantial existing user base. A small business launching its app will not see these results overnight.

The real gain is found elsewhere: in the re-engagement of existing users. When someone has already installed your app, offering it directly in the SERPs instead of the mobile site creates a frictionless shortcut. The problem? You first need to convince people to install the app, which remains the key challenge for most players.

What Are the Limits Google Doesn’t Mention?

First limit: app indexing only works for mobile users, and only on searches where the intent matches app content. Google will not overweight your app if the web content is more relevant. The algorithm remains the master of the game, and it always favors the best answer to the query, not the best technology.

Second limit: iOS applications are treated differently from Android apps. Apple’s Universal Links impose stricter technical constraints, and Google has historically favored the Android ecosystem in its innovations. As a result, the gains are not symmetrical between the two platforms. [To be verified] based on your dominant mobile audience.

When Is This Strategy Not Justified?

If your mobile site is properly optimized with green Core Web Vitals, impeccable responsive design, and loading times under 2 seconds, the investment in an app may not be justified. The user experience delta will be too small to justify the development and maintenance costs of a native application.

Another problematic case: sites with mostly informational content and few interactive features. An app that merely displays articles doesn’t offer anything more than a well-designed PWA. Google itself promotes Progressive Web Apps as a credible alternative when a native app is not justified. App indexing remains relevant for transactional services, marketplaces, SaaS platforms, or media with a strong community component.

How to Effectively Implement App Indexing?

First step: map your URL architecture and define a strict correspondence between web pages and app screens. Each deep link must point to content that is identical or better than the web version. No shortcuts: a missing page in the app will create a disruption of experience that penalizes both the user and your indexing.

Second step: implement the appropriate SDKs. For Android, Firebase App Indexing is integrated via Gradle and requires declaring intent filters in the manifest. For iOS, Universal Links go through the apple-app-site-association file hosted at the domain root. Both systems require a cross-verification between app and web server.

What Mistakes Should You Absolutely Avoid?

Classic mistake: configuring deep links without thoroughly testing the fallback to the mobile site. If a user doesn’t have the app installed and the link fails, you permanently lose that visit. Google penalizes shaky implementations by drastically reducing the frequency of app result displays.

Another trap: duplicating content between app and mobile site without added value in the application. Google detects these situations and won’t provide any special boost. Worse, you disperse your quality signals between two channels without real gain. The app must offer native functionalities, personalization, or superior performance to justify its indexing.

How to Measure Results and Optimize?

Google Search Console offers a dedicated section for indexed app performance, accessible via the side menu. You will find impressions, clicks, and click-through rates specific to app results. Cross-reference this data with your app analytics to identify the screens that convert the best from organic search.

Beyond vanity metrics, monitor the retention rate of users arriving via app indexing compared to those arriving via the mobile site. If the bounce rate is comparable, your app doesn’t provide enough differentiated value. Iterate on the user experience rather than pushing app indexing further.

• Map the web/deep link correspondence before any development
• Implement verification files (assetlinks.json, apple-app-site-association) and validate their accessibility
• Test deep links on real devices, with and without the app installed
• Configure Search Console to monitor app indexing performance
• Measure retention rate and traffic quality for app vs. mobile site
• Maintain strict content parity between app and site to avoid experience disruptions