The Sign-in by Email option is specifically designed for users who purchased their subscription through our website. When you log in, the app can verify your purchase and show you your subscription details.
If you bought your subscription directly in the app, you already have access to all premium features, so there's no need for an email sign-in. Both subscriptions —whether from the app or the website — offer the same benefits. The only difference is how you made the purchase.
✍️ Note: In the app there's no account creation feature, which means all your data and progress are stored locally on your device's iCloud and is never transferred to our servers for privacy reasons.