Support
Questions, a bug, or an idea? Email hello@zaynstack.com. Tell us your device and iOS version, and a real person will answer.
Subscriptions
Pro is managed by Apple. To cancel or change it, open Settings › your name › Subscriptions on your iPhone, or use Manage Subscription in the app's Settings. To restore a purchase on a new device, use Restore on the Pro screen.
Frequently asked
Is the app free?
Yes. All sounds, scenes, the mixer, the sleep timer and the night light are free. Pro is an optional subscription for cry detection, logs, family sharing, backup and the AI features.
Does cry detection record my baby?
No. Cry detection listens on your iPhone using Apple's on-device sound analysis. Nothing is recorded, stored or sent anywhere.
Do you collect any data about my family?
No. There's no account and no tracking. Your logs stay on your device, and family sharing and backup use your own iCloud, which we can't see.
How do the AI features work?
AI features use your own OpenAI-compatible API key, added in Settings and stored in your device's Keychain. Requests go straight from your phone to your provider.
Is it a baby monitor or medical device?
No. The app offers general tips, not medical advice. Cry detection and the two-phone monitor are helpers, never a replacement for watching your baby. Follow safe-sleep guidance and talk to your pediatrician.
Which devices and languages are supported?
iPhone, iPad, Apple Watch and Apple TV, in 19 languages including English, German, Turkish, French and Spanish.
General tips, not medical advice. Follow safe-sleep guidance and talk to your pediatrician. Cry detection and the monitor are not medical or safety devices. Keep the phone away from the crib and the volume low.