On iPhone or Android, open Menu → My Account → Delete account. This permanently deletes the account and everything in it.
Nothing is kept afterward.
Email support@cacele.com from the address you signed in with, with the subject Delete my Lullaby account. We delete server-side data within 30 days.
You can also remove Lullaby’s data from your own storage: iCloud on iPhone, or Google Drive → Settings → Manage apps → Lullaby → Delete hidden app data.
Deleting your account doesn’t cancel a subscription. Cancel it in Apple ID → Subscriptions or Google Play → Payments & subscriptions.