Detailed definition
The Pixel collects data in the browser (cookie-based); with ATT (App Tracking Transparency) from iOS 14.5 onwards, 30-40% of that data was lost. CAPI sends conversions server-side and is not affected by cookie restrictions. Set-up: Stape, Google Tag Manager Server-Side, the Shopify CAPI app and similar. CAPI + Pixel together = the data quality score is pushed to its maximum.
Examples
- An iOS user's purchase does not show up in the Pixel; it is captured once CAPI passes it from the server to Meta.