In-app vs mobile-web inventory: where each actually beats the other

In-app vs mobile-web inventory: where each actually beats the other

Same user, two very different buys. The cheaper CPM is rarely the real winner.

In-app inventory
— ✓ Full SDK signal: device, session depth, sometimes deterministic IDs (Android)
— ✓ Rewarded and interstitial formats convert hard for gaming/utility
— ✗ Viewability and fraud risk higher, SDK spoofing is a real tax

Mobile-web inventory
— ✓ Easier MRC viewability measurement, cleaner third-party verification
— ✓ No app-store gate, instant landing for lead-gen and finance offers
— ✗ Cookie loss and ITP gut your retargeting and post-click attribution

For app-install and gaming offers, in-app's format depth wins despite the fraud overhead. For lead-gen, finance, and anything needing strong viewability proof, web is the cleaner buy.

Verdict: in-app for installs and engagement formats, web for verifiable, click-driven lead-gen.
Best for: buyers choosing a channel before the creative is even built.