Are ASO and App Indexing two mobile strategies that Google clearly distinguishes?

Why does Google bother to clarify this distinction?

Because confusion has reigned among advertisers for years. Many believe that optimizing their Google Play or App Store listing will be enough to gain visibility in Google search itself. That's incorrect.

ASO (App Store Optimization) targets the internal algorithms of the stores: title, description, screenshots, ratings, and downloads. It's a distinct acquisition channel, managed by Apple and Google Play, with its own ranking rules. Good ASO improves the conversion rate on the stores, but does not directly influence the SEO of the app content in standard SERPs.

What is App Indexing and what does it really do?

App Indexing enables the internal content of a mobile application to appear in Google search results. Specifically, if a user searches for "apple pie recipe" on mobile, Google can display a deep link to a recipe within the app instead of the web version.

This requires three technical prerequisites: configured deep links, the declaration of links in the Digital Asset Links file (Android) or the Apple App Site Association file (iOS), and effective indexing by Googlebot. Without this infrastructure, the content remains invisible to the engine, regardless of the quality of the ASO.

Are the two levers complementary or independent?

Independent in their functioning, yet complementary in a holistic mobile strategy. A user discovers the app through a web search thanks to App Indexing, checks out the content, and then searches for the app in the store if the experience is appealing: this is where ASO comes into play to convert intention into an install.

The reverse also holds true: a well-ranked app on the stores generates organic installs, and these active users may later click on App Indexing results in their future searches. However, technically, one does not improve the other. They are two distinct algorithmic silos.

• ASO = optimizing the app listing on Google Play / App Store (title, keywords, visuals, reviews)
• App Indexing = crawling and indexing the internal content of the app by Googlebot via deep links
• ASO does not influence the ranking of app content in web SERPs
• App Indexing requires technical infrastructure (Digital Asset Links, AASA)
• The two levers complement each other in a complete mobile user journey but operate independently

Does this separation align with what we see in practice?

Yes, and it's a source of frustration for many app publishers. We frequently observe apps with impeccable ASO — top 3 on their store keywords — that generate no organic web traffic because App Indexing has never been set up. The reverse also exists: technically indexed apps that are invisible on the stores due to a lack of editorial optimization.

Google is merely formalizing a technical reality: the stores are closed ecosystems with their own APIs and algorithms, over which Google has only indirect control (even on Play Store, where ranking signals remain opaque). App Indexing, on the other hand, relies on the classic Search infrastructure: crawling, indexing, and ranking based on relevance and authority of the associated domain.

What grey areas remain in this declaration?

Google remains vague about the impact of cross signals. For example, does a high volume of organic installs via the store indirectly boost the ranking of deep links in Search? [To be verified], but some field correlations suggest it does, likely via behavioral signals (CTR, engagement).

Another blind spot: the prioritization between web and app in mobile SERPs. Google claims to index app content, yet we still observe that traditional web results largely dominate, except for very specific queries. The statement offers no criteria to know when an app link will be preferred over an equivalent web page.

When does this distinction become less relevant?

For apps without indexable content (games, tools, utilities), App Indexing makes no sense. Only ASO matters. Conversely, for a content publisher (media, e-commerce, recipes) prioritizing responsive mobile web, investing in App Indexing may be counterproductive: it fractures SEO authority across two platforms.

Lastly, on iOS, App Indexing remains constrained by Apple’s restrictions. Universal links work, but Google’s indexing is less mature than on Android. In this context, focusing first on App Store ASO often proves more cost-effective than a complex App Indexing effort. [To be verified] depending on verticals, but it's a cost/benefit trade-off to evaluate on a case-by-case basis.

What should you concretely do if you have a mobile app?

First step: audit the existing setup. Check if deep links are already configured (Android App Links, Universal Links iOS). Use the app links testing tool in Search Console to see if Google can validate the association between your domain and your app.

Next, make a decision based on your model: if the app contains unique content not available on the web (premium features, exclusive UGC), App Indexing becomes a priority. If the app is merely a UX overlay of the website, focus first on responsive design and ASO to acquire users, then evaluate App Indexing in phase 2.

What mistakes should be avoided during deployment?

Never implement App Indexing without configuring fallback URLs: if the user doesn't have the app installed, the deep link must redirect to the equivalent web page, otherwise you lose traffic. A common mistake is a broken deep link that leads to an error screen or, worse, the app's home screen.

Another pitfall: neglecting analytics tracking. Clicks on indexed deep links do not automatically show up in GA4 as regular organic traffic. You need to configure Firebase events or adjust tracking to measure the actual ROI of App Indexing, otherwise you're navigating blind.

How do you check that everything is working correctly?

Use the URL Inspection Tool in Search Console in app indexing mode (option available if the domain-app association is validated). Google will tell you if the deep link is crawlable, indexable, and if it detects configuration errors. Also manually test by searching for specific content from your app: you should see results with the app icon and the "Open" button appearing.

On the ASO side, monitor positions on store keywords with third-party tools (App Annie, Sensor Tower) and crosscheck with conversion data (install rate). If ASO is improving but App Indexing isn't generating incremental traffic, that's a signal that the technical implementation may be problematic or that the app content isn't sufficiently differentiated from the web.

• Audit the configuration of deep links (Android App Links, Universal Links iOS) and validate the domain-app association in Search Console
• Define a prioritized strategy: ASO first if the app is purely utility-based, App Indexing if unique indexable content exists
• Configure fallback URLs to redirect to the web if the app is not installed
• Set up analytics tracking (Firebase, GA4) to measure app organic traffic distinct from web traffic
• Test indexing with the URL Inspection Tool and check for the display of deep links in mobile SERPs
• Monitor ASO KPIs (store positions, install rate) separately from App Indexing KPIs (impressions, deep link clicks)