Conversion tracking is the difference between running a profitable app campaign and burning money on low-quality installs. Google Ads App campaigns rely entirely on machine learning to optimize bids and placements across Search, Play, YouTube, and the Display Network. Without conversion data, the algorithm has no signal to distinguish a user who installs and immediately deletes from one who completes onboarding, makes a purchase, or becomes a retained user. When you feed Google meaningful in-app events—first purchase, level completion, subscription start, or a custom engagement milestone—the system learns which user segments and creative variations drive valuable actions. Over a few hundred conversions, Smart Bidding shifts spend toward placements and audiences that convert, not just install. We've seen CPAs drop 40–60% once proper event tracking kicks in and the campaign exits learning mode. Without conversion tracking, you optimize for install volume alone, which attracts incentivized users, bots, and people who download anything free. Your retention rate collapses, LTV stays near zero, and you're stuck troubleshooting why installs don't translate to revenue. Google's black-box automation becomes a liability instead of an asset. Set up Firebase or your MMP (Adjust, AppsFlyer) to pass events back to Google Ads within 72 hours of install. Track at least one post-install event that correlates with revenue or retention—don't rely solely on installs. Use value-based bidding if your app monetizes through purchases, passing actual revenue so Google can optimize for ROAS, not just conversion count. At Ottawa SEO, we configure event tracking before launching any app campaign and let it accumulate 50–100 conversions in manual CPA mode before switching to automated strategies. Skipping this step turns a $5,000 test budget into a lesson in why data infrastructure matters more than creative in app growth.