There will always be a difference between Embrace and the App Store since the App Store will only track sessions & crashes for those users who opt-in. This article suggests that only 25% of users typically opt into the app tracking worldwide. Embrace will still capture 100% of all user sessions (regardless if a user opts in or not). Therefore we expect to have higher numbers than the app store. It’s hard to estimate exactly how much since it can vary from app to app.