Web-to-App Connect — The 21% ROI Lift Most Advertisers Ignore

The Opportunity

Google’s data shows that using Web to App Connect drives on average 2.8x higher conversion rates by routing app-installed users to in-app experiences via deep linking. App users buy 33% more frequently, purchase 34% more items, and spend 37% more than non-app users. And connecting web and app measurement drives a 21% increase in web campaign ROI.

Why Most Advertisers Skip It

Web-to-App Connect requires coordination across marketing, product, and engineering teams. You need deep links configured (App Links for Android, Universal Links for iOS), app conversion tracking via GA4 or a third-party attribution partner, and Smart Bidding configured to optimize for in-app events. It is genuinely complex.

The Minimum Viable Implementation

Start with the deep link validator in Google Ads (Tools > Planning > App Advertising Hub). It identifies which URLs can be deep linked and estimates the conversion impact. Set up app conversion tracking through GA4 by linking your Firebase project. Import session_start events to enable deep link reporting in the Ad Destination dimension. Mark your core in-app conversion events as Primary. Then enable Web to App Connect in Google Ads and let Smart Bidding route traffic accordingly.

If you have both a website and app but are only measuring web conversions, you are undervaluing your campaigns. App conversions often have higher intent and lifetime value. Consolidating both measurement streams gives Smart Bidding the full picture it needs to optimize effectively.